+publisher:"University of Illinois – Urbana-Champaign" +contributor:("Al-Qadi, Imad")

University of Illinois – Urbana-Champaign

1. Gamez, Angeli Mariz. Impact of curing time on warm mix asphalt short-term performance.

Degree: MS, 0106, 2013, University of Illinois – Urbana-Champaign

► The emerging use of warm mix asphalt (WMA) technology has led to economic and environmental benefits for transportation agencies and road users. Among these benefits… (more)

Subjects/Keywords: warm mix asphalt; stone matrix asphalt (SMA); ground tire rubber; recycled asphalt pavement; asphalt concrete; warm stone matrix asphalt; short-term performance; life cycle assessment; life cycle cost analysis

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APA (6^th Edition):

Gamez, A. M. (2013). Impact of curing time on warm mix asphalt short-term performance. (Thesis). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/42160

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Gamez, Angeli Mariz. “Impact of curing time on warm mix asphalt short-term performance.” 2013. Thesis, University of Illinois – Urbana-Champaign. Accessed April 14, 2021. http://hdl.handle.net/2142/42160.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Gamez, Angeli Mariz. “Impact of curing time on warm mix asphalt short-term performance.” 2013. Web. 14 Apr 2021.

Vancouver:

Gamez AM. Impact of curing time on warm mix asphalt short-term performance. [Internet] [Thesis]. University of Illinois – Urbana-Champaign; 2013. [cited 2021 Apr 14]. Available from: http://hdl.handle.net/2142/42160.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Gamez AM. Impact of curing time on warm mix asphalt short-term performance. [Thesis]. University of Illinois – Urbana-Champaign; 2013. Available from: http://hdl.handle.net/2142/42160

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Illinois – Urbana-Champaign

2. Ghauch, Ziad. Micromechanical finite element modeling of asphalt concrete materials considering moisture presence.

Degree: MS, 0106, 2014, University of Illinois – Urbana-Champaign

URL: http://hdl.handle.net/2142/50423

► Asphalt Concrete (AC) is a composite material consisting of natural or recycled aggregates blended with petroleum-based binder. The majority of pavements in the U.S. include… (more)

Subjects/Keywords: Micromechanical finite element modeling; asphalt concrete; moisture damage

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APA (6^th Edition):

Ghauch, Z. (2014). Micromechanical finite element modeling of asphalt concrete materials considering moisture presence. (Thesis). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/50423

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Ghauch, Ziad. “Micromechanical finite element modeling of asphalt concrete materials considering moisture presence.” 2014. Thesis, University of Illinois – Urbana-Champaign. Accessed April 14, 2021. http://hdl.handle.net/2142/50423.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Ghauch, Ziad. “Micromechanical finite element modeling of asphalt concrete materials considering moisture presence.” 2014. Web. 14 Apr 2021.

Vancouver:

Ghauch Z. Micromechanical finite element modeling of asphalt concrete materials considering moisture presence. [Internet] [Thesis]. University of Illinois – Urbana-Champaign; 2014. [cited 2021 Apr 14]. Available from: http://hdl.handle.net/2142/50423.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Ghauch Z. Micromechanical finite element modeling of asphalt concrete materials considering moisture presence. [Thesis]. University of Illinois – Urbana-Champaign; 2014. Available from: http://hdl.handle.net/2142/50423

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Illinois – Urbana-Champaign

3. Salinas Cortina, Alejandro. Optimization of in-situ tack coat application rate and installation.

Degree: MS, 0106, 2012, University of Illinois – Urbana-Champaign

URL: http://hdl.handle.net/2142/30901

► Interface bonding between pavement layers is a key factor affecting the performance of any pavement structure. Over the years, several studies have been performed to… (more)

▼ Interface bonding between pavement layers is a key factor affecting the performance of any pavement structure. Over the years, several studies have been performed to better understand bonding between pavement layers. The first phase of this study was a laboratory assessment, which analyzed different parameters to better characterize the interlayer bond in pavements. Phase 2 of the study was a field validation and evaluation. This thesis, based on the results of phase 2, focuses on optimizing in-situ tack coat application rate and field installation. The main objectives of phase 2 were to validate the lab-determined optimum residual application rate for tack coat materials on a milled hot-mix asphalt (HMA) surface and to evaluate field performance of tack coat materials. Several parameters were analyzed, including the cleaning method prior to tack coat application, the paving procedure, tack coat type, and existing pavement surface texture. Tack coat materials used were SS-1h, SS-1hp, and SS-1vh (non-track tack coat). For the cleaning methods, the conventional procedures, broom and vacuum, were used on most of the sections and were compared to air-blast cleaning. Two paving procedures were studied: the conventional paving method using a distributor truck and a regular paver, and the spray paver, which applies tack coat and paves at the same time. Twenty-six sections were constructed on Interstate 80 in Illinois, and 19 sections were built on Illinois Route 98. The Interstate 80 test sections were constructed on three existing pavement surfaces: milled HMA, milled Portland cement concrete (PCC), and fresh binder stone mastic asphalt (SMA). Two tests were used to analyze interface bonding: the interface shear test and the torque bond test. The test section on Illinois Route 98 was constructed on a milled surface. All specimens were cored in the field and tested at the Illinois Center for Transportation (ICT) using the Interface Shear Test Device (ISTD). The results showed similar bond strength for the two types of cleaning methods; however, air-blast cleaning required use of a lower optimum residual application rate in the field to achieve the same bond strength. The bond strength at the interface when tack coat was applied with a spray paver is similar to the bond strength achieved when a conventional paver was used. The optimum residual application rate for milled surfaces obtained from the laboratory was 0.06 gal/yd2 (0.27 L/m2). This rate was validated at both test sites. The optimum residual application rate obtained for fresh binder SMA was 0.02 gal/yd2 (0.09 L/m2). SS-1vh performed better than any other tack coat material studied, and SS-1hp performed better than SS-1h. iii Identification of the optimum tack coat application rate will help ensure cost-effective and efficient tack coat application and will enhance pavement performance. It will also help the industry to better optimize resources and improve pavement performance. Advisors/Committee Members: Champaign%22%20%2Bcontributor%3A%28%22Al-Qadi%2C%20Imad%20L.%22%29&pagesize-30">Al-Qadi, Imad L. (advisor).

Subjects/Keywords: Tack coat; Interface Bonding; Shear Strength; SS-1vh; Interface Shear Testing Device; Field Evaluation; Interface; Shear Bonding; Non-track tack coat

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Salinas Cortina, A. (2012). Optimization of in-situ tack coat application rate and installation. (Thesis). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/30901

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Salinas Cortina, Alejandro. “Optimization of in-situ tack coat application rate and installation.” 2012. Thesis, University of Illinois – Urbana-Champaign. Accessed April 14, 2021. http://hdl.handle.net/2142/30901.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Salinas Cortina, Alejandro. “Optimization of in-situ tack coat application rate and installation.” 2012. Web. 14 Apr 2021.

Vancouver:

Salinas Cortina A. Optimization of in-situ tack coat application rate and installation. [Internet] [Thesis]. University of Illinois – Urbana-Champaign; 2012. [cited 2021 Apr 14]. Available from: http://hdl.handle.net/2142/30901.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Salinas Cortina A. Optimization of in-situ tack coat application rate and installation. [Thesis]. University of Illinois – Urbana-Champaign; 2012. Available from: http://hdl.handle.net/2142/30901

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Illinois – Urbana-Champaign

4. Gungor, Osman Erman. Adjustment factors for MEPDG pavement responses considering three- dimensional analysis and wide-base tire.

Degree: MS, Civil Engineering, 2015, University of Illinois – Urbana-Champaign

URL: http://hdl.handle.net/2142/89243

► The Mechanistic-Empirical Pavement Design Guide (MEPDG) provides a superior methodology as compared to its predecessor in the design and analysis of pavement structures. The mechanistic… (more)

▼ The Mechanistic-Empirical Pavement Design Guide (MEPDG) provides a superior methodology as compared to its predecessor in the design and analysis of pavement structures. The mechanistic (MEDPG analysis) calculates critical pavement responses due to pavement-tire interactions. On the other hand, the empirical part refers to the prediction of pavement distress propagation over time using transfer functions. Transfer functions link critical pavement responses to particular pavement distresses. Although MEPDG analysis provides a theoretically framework for pavement simulations, its limitations and simplifications may produce inaccurate pavement response calculations. In contrast, finite element (FE) analysis has proven capable of overcoming these limitations by simulating pavement more realistically in terms of material characterization and loading conditions. However, the high computational cost of the FE analysis precludes its use as a pavement analysis engine within the MEPDG’s framework. Therefore, this study suggests two adjustment factors based on FE analysis to bridge the gap between reality and MEPDG analysis. The first adjustment factor—developed utilizing 480 cases performed in ABAQUS and considering similar material properties and pavement structure—converts pavement responses obtained from dual tire assembly (DTA) loading to new generation wide base tire (NG-WBT) loading. The second adjustment factor—developed from running 336 cases in MEPDG and FE analyses using compatible input parameters—accounts for the limitations of MEPDG analysis regarding the material characterization and loading conditions. The simulated cases were selected to capture extreme conditions—e.g., thick and thin pavement structures with strong and weak material properties—so that extrapolation could be avoided during the implementation of the equations. The adjustment factors revealed that NG-WBT produces higher responses than DTA, which can cause greater pavement damage. Additionally, MEPDG analysis fails to capture the effect of non-uniformity and the three dimensionality of contact stress on pavement response. The discrepancy becomes significant; especially for the pavement responses near the pavement surface, such as tensile strain at the AC surface and vertical shear strain within the AC layer, that are believed to cause top-down cracking. Advisors/Committee Members: Champaign%22%20%2Bcontributor%3A%28%22Al-Qadi%2C%20Imad%20L.%22%29&pagesize-30">Al-Qadi, Imad L. (advisor).

Subjects/Keywords: Mechanistic-Empirical Pavement Design Guide (MEPDG); Adjustment Factors; Finite element (FE) Analysis; AASHTOWare Pavement ME

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APA (6^th Edition):

Gungor, O. E. (2015). Adjustment factors for MEPDG pavement responses considering three- dimensional analysis and wide-base tire. (Thesis). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/89243

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Gungor, Osman Erman. “Adjustment factors for MEPDG pavement responses considering three- dimensional analysis and wide-base tire.” 2015. Thesis, University of Illinois – Urbana-Champaign. Accessed April 14, 2021. http://hdl.handle.net/2142/89243.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Gungor, Osman Erman. “Adjustment factors for MEPDG pavement responses considering three- dimensional analysis and wide-base tire.” 2015. Web. 14 Apr 2021.

Vancouver:

Gungor OE. Adjustment factors for MEPDG pavement responses considering three- dimensional analysis and wide-base tire. [Internet] [Thesis]. University of Illinois – Urbana-Champaign; 2015. [cited 2021 Apr 14]. Available from: http://hdl.handle.net/2142/89243.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Gungor OE. Adjustment factors for MEPDG pavement responses considering three- dimensional analysis and wide-base tire. [Thesis]. University of Illinois – Urbana-Champaign; 2015. Available from: http://hdl.handle.net/2142/89243

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Illinois – Urbana-Champaign

5. Kang, Seung Gu. The development of a regional inventory database for the material phase of the pavement life-cycle with updated vehicle emission factors using moves.

Degree: MS, 0106, 2013, University of Illinois – Urbana-Champaign

URL: http://hdl.handle.net/2142/45592

► Over the past few decades, the growing interest in pavement sustainability has led researchers in government agencies, industries, and academia to develop various sustainability rating… (more)

Subjects/Keywords: Life-cycle assessment (LCA); Pavement; Mobile Vehicle Emission Simulator (MOVES)

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APA (6^th Edition):

Kang, S. G. (2013). The development of a regional inventory database for the material phase of the pavement life-cycle with updated vehicle emission factors using moves. (Thesis). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/45592

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Kang, Seung Gu. “The development of a regional inventory database for the material phase of the pavement life-cycle with updated vehicle emission factors using moves.” 2013. Thesis, University of Illinois – Urbana-Champaign. Accessed April 14, 2021. http://hdl.handle.net/2142/45592.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Kang, Seung Gu. “The development of a regional inventory database for the material phase of the pavement life-cycle with updated vehicle emission factors using moves.” 2013. Web. 14 Apr 2021.

Vancouver:

Kang SG. The development of a regional inventory database for the material phase of the pavement life-cycle with updated vehicle emission factors using moves. [Internet] [Thesis]. University of Illinois – Urbana-Champaign; 2013. [cited 2021 Apr 14]. Available from: http://hdl.handle.net/2142/45592.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Kang SG. The development of a regional inventory database for the material phase of the pavement life-cycle with updated vehicle emission factors using moves. [Thesis]. University of Illinois – Urbana-Champaign; 2013. Available from: http://hdl.handle.net/2142/45592

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Illinois – Urbana-Champaign

6. Yang, Rebekah. Development of a pavement life cycle assessment tool utilizing regional data and introducing an asphalt binder model.

Degree: MS, 0106, 2014, University of Illinois – Urbana-Champaign

URL: http://hdl.handle.net/2142/50651

► The ability to evaluate the sustainability of roadway and pavement systems has become an important and emerging topic in the field of transportation engineering. Life… (more)

▼ The ability to evaluate the sustainability of roadway and pavement systems has become an important and emerging topic in the field of transportation engineering. Life cycle assessment (LCA) is a quantitative method that can be used to measure the environmental impacts of pavements. A LCA framework for pavements is developed to evaluate the environmental burdens of five phases in the life cycle: material production, construction, maintenance, use, and end-of-life. The framework is incorporated into a user-friendly software tool that can be used to facilitate LCA for pavements. As a data-driven methodology, LCA is highly dependent on the data quality and appropriateness of its life cycle inventory. Therefore, a regional inventory database of major material production and construction processes related to pavements is compiled to reflect the State of Illinois, the relevant region in this study. Asphalt binder is one of the major materials contributing to the environmental impact of asphalt pavements. Therefore, in order to improve the accuracy of the inventory, life cycle models for the production of asphalt binder are also developed for five regions in the United States. Findings indicate that the variation in energy consumption and global warming potential (GWP) from binder production can be as high as 24% and 41%, respectively. To validate the LCA framework, a case study regarding a flexible pavement is analyzed for a 60-year period that covers all five phases of the life cycle. With regards to energy and GWP, respectively, the use phase contributes the highest (91.5%, 92.3%), followed by the material phase (3.9%, 3.4%), maintenance phase (3.2%, 2.9%), construction phase (1.2%, 1.2%), and finally the end-of-life phase (0.3%, 0.3%). Sensitivity analyses are also performed to consider different asphalt binder models and landfilling scenarios. Advisors/Committee Members: Champaign%22%20%2Bcontributor%3A%28%22Al-Qadi%2C%20Imad%20L.%22%29&pagesize-30">Al-Qadi, Imad L. (advisor), Champaign%22%20%2Bcontributor%3A%28%22Ozer%2C%20Hasan%22%29&pagesize-30">Ozer, Hasan (advisor).

Subjects/Keywords: life cycle assessment; pavements; asphalt binder; regional; environmental impact; sustainability

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Yang, R. (2014). Development of a pavement life cycle assessment tool utilizing regional data and introducing an asphalt binder model. (Thesis). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/50651

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Yang, Rebekah. “Development of a pavement life cycle assessment tool utilizing regional data and introducing an asphalt binder model.” 2014. Thesis, University of Illinois – Urbana-Champaign. Accessed April 14, 2021. http://hdl.handle.net/2142/50651.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Yang, Rebekah. “Development of a pavement life cycle assessment tool utilizing regional data and introducing an asphalt binder model.” 2014. Web. 14 Apr 2021.

Vancouver:

Yang R. Development of a pavement life cycle assessment tool utilizing regional data and introducing an asphalt binder model. [Internet] [Thesis]. University of Illinois – Urbana-Champaign; 2014. [cited 2021 Apr 14]. Available from: http://hdl.handle.net/2142/50651.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Yang R. Development of a pavement life cycle assessment tool utilizing regional data and introducing an asphalt binder model. [Thesis]. University of Illinois – Urbana-Champaign; 2014. Available from: http://hdl.handle.net/2142/50651

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Illinois – Urbana-Champaign

7. Ma, Jing. Cracking potential of short- and long-term aged binder with various levels of ABR.

Degree: MS, Civil Engineering, 2017, University of Illinois – Urbana-Champaign

URL: http://hdl.handle.net/2142/99096

► It is widely accepted that using reclaimed asphalt pavement (RAP) and recycled asphalt shingles (RAS) could improve the sustainability of asphalt concrete (AC), in terms… (more)

▼ It is widely accepted that using reclaimed asphalt pavement (RAP) and recycled asphalt shingles (RAS) could improve the sustainability of asphalt concrete (AC), in terms of cost savings and environmental factors. This should be only valid when short- and long-term pavement performance are not compromised. This thesis presents an experimental evaluation of the rheological properties of binders from various sources to investigate the effects of aging and increasing asphalt binder replacement (ABR) levels. In addition to the standard Superpave grading parameters, the additional rheological parameters for low-temperature cracking susceptibility and block and fatigue cracking were derived from various dynamic shear rheometer (DSR) and bending beam rheometer (BBR) tests. Binders from five AC designed with varying ABR percentages (from 0 to 60%) were recovered using the standard Rotovap test procedure. The base binder used in the AC design and binders recovered from RAP and RAS were also tested. In addition to standard aging protocols, base binders were subjected to a second pressure aging vessel (PAV), while one PAV was applied for the extracted binders. Almost all additional rheological parameters appeared to maintain consistent trends with aging and increasing ABR levels. The considered parameters are shown to be helpful in evaluating progression in the brittleness of binders with ABR and aging. Based on the outcome of the experimental program (binder level and mixture level), it was concluded that AC with ABR levels above 20 percent could suffer from short- and long-term cracking potential. Asphalt concrete with high ABR content can already be at a critically-aged condition immediately after production and, as a result, aging progresses much faster in the binders of such mixes. Advisors/Committee Members: Champaign%22%20%2Bcontributor%3A%28%22Al-Qadi%2C%20Imad%20L%22%29&pagesize-30">Al-Qadi, Imad L (advisor), Champaign%22%20%2Bcontributor%3A%28%22Ozer%2C%20Hasan%22%29&pagesize-30">Ozer, Hasan (committee member).

Subjects/Keywords: Asphalt binder replacement (ABR); Dynamic shear rheometer (DSR); Bending beam rheometer (BBR); Reclaimed asphalt pavement (RAP); Recycled asphalt shingles (RAS)

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Ma, J. (2017). Cracking potential of short- and long-term aged binder with various levels of ABR. (Thesis). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/99096

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Ma, Jing. “Cracking potential of short- and long-term aged binder with various levels of ABR.” 2017. Thesis, University of Illinois – Urbana-Champaign. Accessed April 14, 2021. http://hdl.handle.net/2142/99096.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Ma, Jing. “Cracking potential of short- and long-term aged binder with various levels of ABR.” 2017. Web. 14 Apr 2021.

Vancouver:

Ma J. Cracking potential of short- and long-term aged binder with various levels of ABR. [Internet] [Thesis]. University of Illinois – Urbana-Champaign; 2017. [cited 2021 Apr 14]. Available from: http://hdl.handle.net/2142/99096.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Ma J. Cracking potential of short- and long-term aged binder with various levels of ABR. [Thesis]. University of Illinois – Urbana-Champaign; 2017. Available from: http://hdl.handle.net/2142/99096

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Illinois – Urbana-Champaign

8. Krami Senhaji, Mouna. Development of a life-cycle assessment tool for flexible pavement in-place recycling techniques and conventional methods.

Degree: MS, Civil Engineering, 2017, University of Illinois – Urbana-Champaign

URL: http://hdl.handle.net/2142/99437

► The worldwide interest in using recycled materials in flexible pavements as an alternative to virgin materials has increased significantly over the past few decades. Therefore,… (more)

▼ The worldwide interest in using recycled materials in flexible pavements as an alternative to virgin materials has increased significantly over the past few decades. Therefore, recycling has been utilized in the pavement maintenance and rehabilitation activities. Three types of in-place recycling technologies have been introduced since the late 70’s: hot-in-place recycling (HIR), cold-in-place recycling (CIR), and full-depth reclamation (FDR). The use of in-place recycling (IPR) have been evolving using new equipment trains, mix design specifications, and use of additives (e.g., engineered emulsion, lime, and cement). The advantages of using these evolving techniques include conservation of virgin materials, reduction of energy use and environmental impacts, reduction of construction time and traffic flow disruptions, reduction of number of hauling trucks, and improvement of pavement condition. The main objectives of this thesis are to develop a framework and a life-cycle assessment (LCA) methodology to evaluate maintenance and rehabilitation treatments, specifically in-place recycling and conventional paving methods; provide a fuel usage analysis of in-place recycling techniques during the construction stage; and develop a LCA tool utilizing Visual Basic for Applications (VBA) to help local and state highway agencies to evaluate environmental benefits and tradeoffs of in-place recycling techniques as compared to conventional rehabilitation methods at each life-cycle stage from the material extraction and production to the end of life. The ultimate outcome of this study is the development of a framework and a user-friendly LCA tool assesses the environmental impact of a wide range of pavement treatments, including in-place recycling, conventional methods, and surface treatments. The tool utilizes data, simulation, and models through all the stages of the IPR stages for the pavement LCA, including materials, construction, maintenance/rehabilitation, use, and end of life stages. The developed tool provides pavement industry practitioners, consultants and agencies the opportunity to complement their projects economic and social assessment with the environmental impacts quantification. In addition, the tool presents the main factors that impact produced emissions and energy consumed at every stage of the pavement life cycle due to pavement treatment. The tool provides detailed information such as fuel usage analysis of in-place recycling techniques based on field data. It shows that fuel usage is affected by pavement hardness, pavement width, air temperature, and horsepower of the equipment used. Advisors/Committee Members: Champaign%22%20%2Bcontributor%3A%28%22Al-Qadi%2C%20Imad%20L%22%29&pagesize-30">Al-Qadi, Imad L (advisor), Champaign%22%20%2Bcontributor%3A%28%22Ozer%2C%20Hasan%22%29&pagesize-30">Ozer, Hasan (committee member).

Subjects/Keywords: Pavements; Life cycle assessment; Sustainability; In-place recycling; Rehabilitation and maintenance; Decision making; Tool development

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Krami Senhaji, M. (2017). Development of a life-cycle assessment tool for flexible pavement in-place recycling techniques and conventional methods. (Thesis). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/99437

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Krami Senhaji, Mouna. “Development of a life-cycle assessment tool for flexible pavement in-place recycling techniques and conventional methods.” 2017. Thesis, University of Illinois – Urbana-Champaign. Accessed April 14, 2021. http://hdl.handle.net/2142/99437.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Krami Senhaji, Mouna. “Development of a life-cycle assessment tool for flexible pavement in-place recycling techniques and conventional methods.” 2017. Web. 14 Apr 2021.

Vancouver:

Krami Senhaji M. Development of a life-cycle assessment tool for flexible pavement in-place recycling techniques and conventional methods. [Internet] [Thesis]. University of Illinois – Urbana-Champaign; 2017. [cited 2021 Apr 14]. Available from: http://hdl.handle.net/2142/99437.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Krami Senhaji M. Development of a life-cycle assessment tool for flexible pavement in-place recycling techniques and conventional methods. [Thesis]. University of Illinois – Urbana-Champaign; 2017. Available from: http://hdl.handle.net/2142/99437

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Illinois – Urbana-Champaign

9. Barry, Maxwell K. An analysis of impact factors on the Illinois flexibility index test.

Degree: MS, Civil Engineering, 2016, University of Illinois – Urbana-Champaign

URL: http://hdl.handle.net/2142/95565

► The use of recycled materials in asphalt pavements has become widespread in recent years. Materials such as recycled asphalt pavement (RAP) and recycled asphalt shingles… (more)

▼ The use of recycled materials in asphalt pavements has become widespread in recent years. Materials such as recycled asphalt pavement (RAP) and recycled asphalt shingles (RAS) have been incorporated into the material design of typical pavements. The use of these materials is both economically and environmentally friendly, at least initially. However, asphalt concrete materials with high recycled content have been shown to have some performance issues, leading to deterioration before the end of the design life. This early deterioration may negate any environmental or economic benefit initially obtained from the use of recycled materials. The typical modes of failure for asphalt pavements with high recycled content are thermal cracking or early fatigue cracking. While RAP and RAS contribute a significant amount of recycled asphalt binder, that is asphalt binder replacement (ABR), the binder may be too stiff for the given application. For this reason, standard Superpave design may be insufficient to prevent cracking when ABR is present. As a result, the Illinois Center for Transportation has developed the Illinois Flexibility Index Test (I-FIT) to evaluate the cracking potential of an asphalt concrete mixture. The I-FIT method is in its early stages, and various impact factors on the test’s output need to be understood. While laboratory-produced specimens can be easily controlled, the qualities of field core specimens are typically out of the researcher’s control. Two main parameters, while controlled for laboratory-produced specimens, will typically be uncontrolled for field core specimens. These parameters are the specimen thickness and the air void content. It is vital to understand the effect of these parameters on the I-FIT method; therefore, these effects are a main focus of investigation in this thesis. Another main focus of this thesis is the mitigation of asphalt concrete mixture stiffness. The I-FIT method was developed specifically to evaluate the flexibility of an asphalt concrete mix. It is ideal for identifying mixtures of excessive stiffness as a result of high levels of ABR. It is also ideal for evaluating the success of methods of stiffness mitigation, that is, increasing flexibility to reduce cracking potential. Typical methods of stiffness mitigation—for example, virgin binder softening—are evaluated in terms of the I-FIT method. Additionally, atypical methods of stiffness mitigation are evaluated, specifically mix-applied rejuvenation. Mix-applied rejuvenation, which closely resembles hot-in-place recycling, is evaluated on a large scale. Rejuvenation of plant mix, laboratory-produced specimens, and field cores is evaluated, and the effectiveness of mix-applied rejuvenation is analyzed via the I-FIT method. Preferable methods of mix-applied rejuvenation are determined, and field applications are suggested. This thesis provides an understanding of the effect of mix and test specimen geometry parameters on I-FIT results. Additionally, the effect of aging on I-FIT results is presented. Advisors/Committee Members: Champaign%22%20%2Bcontributor%3A%28%22Al-Qadi%2C%20Imad%20L%22%29&pagesize-30">Al-Qadi, Imad L (advisor), Champaign%22%20%2Bcontributor%3A%28%22Ozer%2C%20Hasan%22%29&pagesize-30">Ozer, Hasan (advisor).

Subjects/Keywords: llinois flexibility index test (I-FIT); Asphalt; Recycled; Recycled asphalt pavement (RAP); Recycled asphalt shingles (RAS); Asphalt binder replacement (ABR); Pavement; Cracking; Brittleness mitigation; Rejuvenation; Rejuvenator; Hot-in-place recycling (HIR)

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Barry, M. K. (2016). An analysis of impact factors on the Illinois flexibility index test. (Thesis). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/95565

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Barry, Maxwell K. “An analysis of impact factors on the Illinois flexibility index test.” 2016. Thesis, University of Illinois – Urbana-Champaign. Accessed April 14, 2021. http://hdl.handle.net/2142/95565.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Barry, Maxwell K. “An analysis of impact factors on the Illinois flexibility index test.” 2016. Web. 14 Apr 2021.

Vancouver:

Barry MK. An analysis of impact factors on the Illinois flexibility index test. [Internet] [Thesis]. University of Illinois – Urbana-Champaign; 2016. [cited 2021 Apr 14]. Available from: http://hdl.handle.net/2142/95565.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Barry MK. An analysis of impact factors on the Illinois flexibility index test. [Thesis]. University of Illinois – Urbana-Champaign; 2016. Available from: http://hdl.handle.net/2142/95565

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Illinois – Urbana-Champaign

10. Safi, Fazal Rehman. Balancing asphalt mixes containing recycled materials for optimum field performance.

Degree: MS, Civil Engineering, 2017, University of Illinois – Urbana-Champaign

URL: http://hdl.handle.net/2142/99532

► Asphalt concrete (AC) is the most common material used for the construction of pavements in the U.S. and many other countries in the world. With… (more)

▼ Asphalt concrete (AC) is the most common material used for the construction of pavements in the U.S. and many other countries in the world. With the increasing use of recycled materials like reclaimed asphalt pavement (RAP) and recycled asphalt shingle (RAS), the cracking resistance of asphalt pavements might be jeopardized. Therefore, such AC mixtures should be carefully investigated to ensure that performance is not compromised in the pursuit of an economical and sustainable solution. This study investigates 17 mixes including five leveling binders (LB) and 12 surface mixes, which have been used by the Illinois Department of Transportation (IDOT) in different rehabilitation projects across the State of Illinois, between 2013 and 2015. These AC mixes contain asphalt binder replacement (ABR) from 15 to 60%, acquired from RAP and RAS, whereas these mixes also contain steel slag and crushed concrete. In order to evaluate these AC mixes, a thorough laboratory testing, including indirect tensile creep compliance and strength, Hamburg wheel tracking test, and the Illinois flexibility index test (I-FIT) was conducted to evaluate thermal cracking susceptibility, rutting, and cracking resistance, on plant-mixed lab-compacted (PMLC) mixes and three sets of field cores. The extensive exploratory data analysis on creep compliance showed that softer binder and higher asphalt content result in more compliant mixes, while recycled materials tend to decrease the compliance of AC mixes. Likewise, softer binder and recycled materials tend to counterbalance each other’s impact. Similarly, the LB has relatively higher creep compliance as expected due to its design which is intended to retard reflective cracking. The IDT strength at -10°C is very similar across all AC mixes irrespective of the amount of recycled materials. Results also show that IDT creep compliance and strength might not distinguish the effect of field aging. The Pavement Mechanistic-Empirical Design Guide (MEPDG) uses the empirically developed model for the prediction of creep compliance as an input for Level 3 analysis, which uses mix and binder properties. However, the impact of recycled materials was not captured in the MEPDG nor in the modified models. This research proposes a new model to predict creep compliance that captures the effect of recycled materials. The I-FIT results show that PMLC mixes have relatively lower flexibility index (FI) as compared to first field cores due to the difference in aging and compaction conditions. FI decreases with the increase in aging and recycled materials, while the strength and secant modulus increase. All AC mixes offered excellent rutting resistance, because they contain high ABR, and the resistance increased with aging as expected. The balanced mix design approach was utilized, based on rut depth and FI, which showed the convergence of AC mixes to stiffer zone with field aging. Similarly, secant modulus was added to the existing balance mix design as a stiffness indicator to control soft mixes. Furthermore, the field… Advisors/Committee Members: Champaign%22%20%2Bcontributor%3A%28%22Al-Qadi%2C%20Imad%20L%22%29&pagesize-30">Al-Qadi, Imad L (advisor), Champaign%22%20%2Bcontributor%3A%28%22Ozer%2C%20Hasan%22%29&pagesize-30">Ozer, Hasan (committee member).

Subjects/Keywords: Asphalt binder replacement (ABR); Reclaimed asphalt pavement (RAP); Recycled asphalt shingle (RAS); Mechanistic-Empirical Design Guide (MEPDG); Thermal cracking; Creep compliance modeling; Balance mix design; Total recycled asphalt (TRA) mixes; Field cores; Transverse cracking; Field performance; Illinois flexibility index test (I-FIT); Secant modulus

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Safi, F. R. (2017). Balancing asphalt mixes containing recycled materials for optimum field performance. (Thesis). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/99532

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Safi, Fazal Rehman. “Balancing asphalt mixes containing recycled materials for optimum field performance.” 2017. Thesis, University of Illinois – Urbana-Champaign. Accessed April 14, 2021. http://hdl.handle.net/2142/99532.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Safi, Fazal Rehman. “Balancing asphalt mixes containing recycled materials for optimum field performance.” 2017. Web. 14 Apr 2021.

Vancouver:

Safi FR. Balancing asphalt mixes containing recycled materials for optimum field performance. [Internet] [Thesis]. University of Illinois – Urbana-Champaign; 2017. [cited 2021 Apr 14]. Available from: http://hdl.handle.net/2142/99532.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Safi FR. Balancing asphalt mixes containing recycled materials for optimum field performance. [Thesis]. University of Illinois – Urbana-Champaign; 2017. Available from: http://hdl.handle.net/2142/99532

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Illinois – Urbana-Champaign

11. Okte, Egemen. Effect of pavement surface properties on life cycle cost analysis.

Degree: MS, Civil Engineering, 2018, University of Illinois – Urbana-Champaign

URL: http://hdl.handle.net/2142/102814

► Life Cycle Cost Analysis (LCCA) is one of the most well established methods used in determining the best alternative pavement project. The two main pillars… (more)

▼ Life Cycle Cost Analysis (LCCA) is one of the most well established methods used in determining the best alternative pavement project. The two main pillars of LCCA are user costs and agency costs. User costs are incurred during normal transportation operation and when there is a work zone present. Costs that occur during normal operating conditions are due to pavement surface profile, while costs that occur during work zone activities are due to agency decisions on work zone conditions. In traditional LCCA, it is assumed that work zones costs are the main part of user costs. The work zone costs include vehicle delay costs, vehicle operating costs, crash costs, and emission costs. On the other hand, costs associated with normal operating conditions, such as vehicle operating costs, are independent of project alternatives and thus they are negligible. However, recent studies have suggested that vehicle operating costs are more sensitive to roughness and texture profile than initially thought. Therefore, even slight changes in pavement surface profile may affect user costs. This study introduces a methodology that considers normal operating conditions in LCCA; including pavement surface properties. The approach is presented in a Microsoft Excel Visual Basic (VBA) tool. Finally, a case study is presented to illustrate the importance of user costs for normal operating conditions and their effect on LCCA. Analysis showed that for medium to low traffic roadways, the impact of normal operating costs is significant when compared to work zone costs. Furthermore, decreasing the number of treatment activities may increase the user costs because the pavement is less frequently improved. In addition, as would be expected, it was found that with increasing discount rates, the significance of normal operating costs further increase. Advisors/Committee Members: Champaign%22%20%2Bcontributor%3A%28%22Al-Qadi%2C%20Imad%20L.%22%29&pagesize-30">Al-Qadi, Imad L. (advisor), Champaign%22%20%2Bcontributor%3A%28%22Ozer%2C%20Hasan%22%29&pagesize-30">Ozer, Hasan (committee member).

Subjects/Keywords: Pavement LCA LCCA User Cost

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Okte, E. (2018). Effect of pavement surface properties on life cycle cost analysis. (Thesis). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/102814

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Okte, Egemen. “Effect of pavement surface properties on life cycle cost analysis.” 2018. Thesis, University of Illinois – Urbana-Champaign. Accessed April 14, 2021. http://hdl.handle.net/2142/102814.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Okte, Egemen. “Effect of pavement surface properties on life cycle cost analysis.” 2018. Web. 14 Apr 2021.

Vancouver:

Okte E. Effect of pavement surface properties on life cycle cost analysis. [Internet] [Thesis]. University of Illinois – Urbana-Champaign; 2018. [cited 2021 Apr 14]. Available from: http://hdl.handle.net/2142/102814.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Okte E. Effect of pavement surface properties on life cycle cost analysis. [Thesis]. University of Illinois – Urbana-Champaign; 2018. Available from: http://hdl.handle.net/2142/102814

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Illinois – Urbana-Champaign

12. Zhu, Zehui. Impact of laboratory simulated aging on asphalt concrete flexibility.

Degree: MS, Civil Engineering, 2018, University of Illinois – Urbana-Champaign

URL: http://hdl.handle.net/2142/102939

► The aging of asphalt materials is considered an important factor contributing to the deterioration of asphalt concrete (AC) pavements. Asphalt binder aging is a combination… (more)

▼ The aging of asphalt materials is considered an important factor contributing to the deterioration of asphalt concrete (AC) pavements. Asphalt binder aging is a combination of various complex mechanisms that affect its rheological properties causing AC to become stiffer and more brittle. As a result of aging, the resistance of AC pavements to various forms of cracking including fatigue, thermal, and/or block is reduced. Hence, AC aging presents challenges for preserving an adequate level of pavement serviceability. Therefore, it is critical to understand the effect of aging on AC pavement cracking development and identify the effect of AC mix design parameters on the aging rate. A wide range of AC mixes were investigated in this study using the Illinois Flexibility Index Test (I-FIT) after the specimens were subjected to various lab-simulated long-term aging conditions. The flexibility index (FI), an outcome of the I-FIT and a measure of the AC flexibility. decreases consistently after long-term aging. This effect is primarily due to changes in the post-peak slope, an indication of crack propagation speed. The impact of aging on various AC mixtures varies and results in different FI deductions because of the mix type and aging condition. Simple and multiple linear regression were used to analyze the impact of mix design parameters on AC aging rate. The effect of voids in mineral aggregate (VMA), low-temperature performance-grade (PG), asphalt binder replacement (ABR), AC mix type, water absorption of the aggregate blend, and effective asphalt binder content was found to be significant. Several aging levels were examined using a conventional oven and utilizing both compacted and loose AC mixes. The various aging levels were compared to the standard five-day aging at 85 °C (5D/85C). The study found that aging compacted I-FIT specimens at 3D/95C is practical and is equivalent to that at 5D/85. Additionally, because the parameters impacting aging at 1D/95C and 3D/95C are the same and have the same trend, 1D/95C may be used as an initial indicator for long-term aging. Advisors/Committee Members: Champaign%22%20%2Bcontributor%3A%28%22Al-Qadi%2C%20Imad%20L.%22%29&pagesize-30">Al-Qadi, Imad L. (advisor), Champaign%22%20%2Bcontributor%3A%28%22Ozer%2C%20Hasan%22%29&pagesize-30">Ozer, Hasan (advisor).

Subjects/Keywords: Asphalt concrete; Flexibility index; Long-term aging; Aging rate; Mixture design

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Zhu, Z. (2018). Impact of laboratory simulated aging on asphalt concrete flexibility. (Thesis). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/102939

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Zhu, Zehui. “Impact of laboratory simulated aging on asphalt concrete flexibility.” 2018. Thesis, University of Illinois – Urbana-Champaign. Accessed April 14, 2021. http://hdl.handle.net/2142/102939.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Zhu, Zehui. “Impact of laboratory simulated aging on asphalt concrete flexibility.” 2018. Web. 14 Apr 2021.

Vancouver:

Zhu Z. Impact of laboratory simulated aging on asphalt concrete flexibility. [Internet] [Thesis]. University of Illinois – Urbana-Champaign; 2018. [cited 2021 Apr 14]. Available from: http://hdl.handle.net/2142/102939.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Zhu Z. Impact of laboratory simulated aging on asphalt concrete flexibility. [Thesis]. University of Illinois – Urbana-Champaign; 2018. Available from: http://hdl.handle.net/2142/102939

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

13. El Khatib, Ahmad K. Development of a performance-based test method for quantification of cracking potential in asphalt pavement materials.

Degree: MS, Civil Engineering, 2016, University of Illinois – Urbana-Champaign

URL: http://hdl.handle.net/2142/95336

► With the increasing use of recycled materials in the construction of roadways, it is more critical now than ever to understand the impact that these… (more)

Subjects/Keywords: Illinois flexibility index test (I-FIT); Cracking; Crack; Asphalt; Hot-mix asphalt; Pavement; Transportation; Semicircle bending beam (SCB); Flexibility index; Balanced mix design

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

El Khatib, A. K. (2016). Development of a performance-based test method for quantification of cracking potential in asphalt pavement materials. (Thesis). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/95336

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

El Khatib, Ahmad K. “Development of a performance-based test method for quantification of cracking potential in asphalt pavement materials.” 2016. Thesis, University of Illinois – Urbana-Champaign. Accessed April 14, 2021. http://hdl.handle.net/2142/95336.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

El Khatib, Ahmad K. “Development of a performance-based test method for quantification of cracking potential in asphalt pavement materials.” 2016. Web. 14 Apr 2021.

Vancouver:

El Khatib AK. Development of a performance-based test method for quantification of cracking potential in asphalt pavement materials. [Internet] [Thesis]. University of Illinois – Urbana-Champaign; 2016. [cited 2021 Apr 14]. Available from: http://hdl.handle.net/2142/95336.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

El Khatib AK. Development of a performance-based test method for quantification of cracking potential in asphalt pavement materials. [Thesis]. University of Illinois – Urbana-Champaign; 2016. Available from: http://hdl.handle.net/2142/95336

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

14. Kanaan, Ahmad. Impact of recycled asphalt shingles on asphalt concrete characteristics.

Degree: MS, 0106, 2013, University of Illinois – Urbana-Champaign

URL: http://hdl.handle.net/2142/45354

► The use of recycled materials in asphalt mixtures such as reclaimed asphalt pavements (RAP) and more recently recycled asphalt shingles (RAS) have become widely accepted… (more)

▼ The use of recycled materials in asphalt mixtures such as reclaimed asphalt pavements (RAP) and more recently recycled asphalt shingles (RAS) have become widely accepted in the United States as a replacement for virgin asphalt binder or virgin aggregates. However, the economics and the challenges of using them were not viable until recently. The use of RAP and RAS thus represents one of the most convenient ways of reducing production costs even while improving the sustainability of pavement systems by replacing part of the virgin materials in Hot-Mix Asphalt (HMA). This study examined the effect of high asphalt binder replacement for a low N-design asphalt mixture, including RAP and RAS on the different asphalt mixture performance indicators such as permanent deformation, fracture, fatigue potentials, and stiffness. In addition, fine asphalt mixture (FAM) samples were prepared using fine aggregates (FM-20) and different RAS percentages mixed with either PG46-34 or PG64-22 asphalt binder. The main objective of this part of the study was to develop time efficient protocols to evaluate the influence of recycled materials on asphalt mixture performance. An experimental program for the regular mixes included complex modulus, fracture, overlay reflective cracking resistance, wheel track permanent deformations, and push-pull fatigue tests. The asphalt binder replacement levels in the mix using combinations of RAS and RAP were in the range of 43% to 64%. For the FMA, in addition to the control mix with PG64-22 (0.0% RAS), mixes with 7.1% RAS content, and RAS contents at 2.5% and 7.1% were used with PG46-34. The testing program for the FAM specimens included complex shear modulus, shear strength and fatigue. For the asphaltic mixtures, RAS reduced rutting potential. However, fracture tests at low temperature did not reveal any significant difference between the specimens prepared with varying percentages of asphalt binder replacement. The fatigue potential of mixtures increased with increasing RAS content and asphalt binder replacement. The specimens prepared with 2.5% RAS and PG46-34 showed the best fatigue performance. The impact of asphalt binder bumping was noticeable when the asphalt binder type was changed from PG 58-28 to PG 46-34 at the highest asphalt binder replacement level; fatigue life and fracture energy were improved. The results showed that complex modulus test results can provide crucial information about the mix viscoelastic properties such as relaxation potential and long-term stiffness that can be used, along with fracture tests, to evaluate mix brittleness at relatively high asphalt binder replacement levels. Results obtained from FAM testing shown to be comparable to the asphalt mixture results. A good correlation was observed between both asphalt mixture complex modulus and the FMA complex shear modulus obtained using the DSR. The results from the FAM specimens were shown to be consistent and sensitive to varying RAS percentages. Results obtained from the DSR testing showed that the mixes prepared… Advisors/Committee Members: Champaign%22%20%2Bcontributor%3A%28%22Al-Qadi%2C%20Imad%20L.%22%29&pagesize-30">Al-Qadi, Imad L. (advisor).

Subjects/Keywords: Recycled materials; asphalt Binder replacement (ABR); recycled asphalt shingles (RAS); reclaimed asphalt pavements (RAP)

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Kanaan, A. (2013). Impact of recycled asphalt shingles on asphalt concrete characteristics. (Thesis). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/45354

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Kanaan, Ahmad. “Impact of recycled asphalt shingles on asphalt concrete characteristics.” 2013. Thesis, University of Illinois – Urbana-Champaign. Accessed April 14, 2021. http://hdl.handle.net/2142/45354.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Kanaan, Ahmad. “Impact of recycled asphalt shingles on asphalt concrete characteristics.” 2013. Web. 14 Apr 2021.

Vancouver:

Kanaan A. Impact of recycled asphalt shingles on asphalt concrete characteristics. [Internet] [Thesis]. University of Illinois – Urbana-Champaign; 2013. [cited 2021 Apr 14]. Available from: http://hdl.handle.net/2142/45354.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Kanaan A. Impact of recycled asphalt shingles on asphalt concrete characteristics. [Thesis]. University of Illinois – Urbana-Champaign; 2013. Available from: http://hdl.handle.net/2142/45354

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

15. Hasiba, Khaled. Development of a testing approach for tack coat application rate at pavement layer interfaces.

Degree: MS, 0106, 2012, University of Illinois – Urbana-Champaign

URL: http://hdl.handle.net/2142/30977

► Pavement interlayer bonding is one of the critical factors that affect the pavement service life. In addition to difficulties in compaction, lack of interface bonding… (more)

▼ Pavement interlayer bonding is one of the critical factors that affect the pavement service life. In addition to difficulties in compaction, lack of interface bonding can lead to serious pavement deterioration including slippage cracking, de-bonding, and early fatigue cracking, all of which eventually reduce the pavement service life. Several experimental programs and numerical research have been conducted to investigate factors that affect the interface bonding. According to the existing literature, interface bonding is affected by different factors including tack coat material, application rate and temperature, as well as pavement mix type, volumetric characteristics, surface texture and cleanliness. Tack coat is a light layer of diluted asphalt that is applied to hot mix asphalt concrete (HMA) or Portland cement concrete (PCC) pavement surfaces to ensure good interface bonding between layers. This study evaluated interface bonding between two HMA layers utilizing a laboratory shear performance test. The main objective of this study was to evaluate the performance of various tack coats and determine the optimum residual application rates for three various pavement surface conditions: unmilled aged non-trafficked, milled aged, and unmilled aged trafficked HMA. The study also examined the influences of tack coat curing time, temperature, HMA type, and surface texture on the performance of tack coats. The study considered four tack coat materials: SS-1hp, high float emulsion (HFE), SS-1vh (very hard non track emulsion), and straight asphalt (PG 64-22). The tack coat was optimized at residual rates of 0.00, 0.02, 0.04, 0.06, and 0.08 gal/yd2 (0.00, 0.09, 0.18, 0.26, and 0.36 L/m2). Three curing times were considered: 0.25, 2, and 24 hrs. Two overlay mixes (9.5-mm surface mix and 4.75-mm mix) were used. Prior to testing, the specimens were conditioned at four temperatures: 5°F, 41°F, 77°F, and 113°F (–15°C, 5°C, 25°C, and 45°C). The study found that the optimum tack coat residual rate was 0.04 gal/yd2 (0.18 L/m2) for trafficked and non-trafficked unmilled aged HMA surface, while the optimum residual rate for milled HMA was 0.06 gal/yd2 (0.26 L/m2). SS-1vh tack coat showed superior performance compared to other tested tack coats. The optimum curing time was determined at 2 hrs. Milling the surface improved interface shear strength. The interface shear resistance was greater when the surface nominal maximum aggregate size (NMAS) increased from 4.75 mm to 9.5 mm. Increasing the temperature resulted in a reduction in shear strength. The initial tangent stiffness for different tack coat materials was calculated and studied at various temperatures between 5°F (-15°C) and 113°F (45°C). The analysis showed that SS-1vh had the highest stiffness compared to the materials used. However, a continuous reduction in the initial tangent stiffness was observed when increasing the temperature within the temperature range used in this study. Advisors/Committee Members: Champaign%22%20%2Bcontributor%3A%28%22Al-Qadi%2C%20Imad%20L.%22%29&pagesize-30">Al-Qadi, Imad L. (advisor).

Subjects/Keywords: interface; interlayer; shear strength; tack coat; SS-1vh; bonding; HMA-HMA; temperature; curing time; mix type; application rate; surface texture; Hot Mix Asphalt Concrete (HMA)

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Hasiba, K. (2012). Development of a testing approach for tack coat application rate at pavement layer interfaces. (Thesis). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/30977

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Hasiba, Khaled. “Development of a testing approach for tack coat application rate at pavement layer interfaces.” 2012. Thesis, University of Illinois – Urbana-Champaign. Accessed April 14, 2021. http://hdl.handle.net/2142/30977.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Hasiba, Khaled. “Development of a testing approach for tack coat application rate at pavement layer interfaces.” 2012. Web. 14 Apr 2021.

Vancouver:

Hasiba K. Development of a testing approach for tack coat application rate at pavement layer interfaces. [Internet] [Thesis]. University of Illinois – Urbana-Champaign; 2012. [cited 2021 Apr 14]. Available from: http://hdl.handle.net/2142/30977.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Hasiba K. Development of a testing approach for tack coat application rate at pavement layer interfaces. [Thesis]. University of Illinois – Urbana-Champaign; 2012. Available from: http://hdl.handle.net/2142/30977

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Illinois – Urbana-Champaign

16. Son, Songsu. Development of a phenomenological constitutive model for fracture resistance degradation of asphalt concrete with damage growth due to repeated loading.

Degree: PhD, 0106, 2014, University of Illinois – Urbana-Champaign

URL: http://hdl.handle.net/2142/49825

► Discontinuous areas under the asphalt concrete (AC) layer, such as joints and cracks in an underlying layer, induce higher stress concentration than the designed strength.… (more)

▼ Discontinuous areas under the asphalt concrete (AC) layer, such as joints and cracks in an underlying layer, induce higher stress concentration than the designed strength. Stress concentration in the vicinity of discontinuities accelerates distress on the AC layer. Repeated traffic and environmental loading applied to the AC layer also induce degradation of the layer’s strength as microcracks grow at stress levels lower than the layer’s designed strength. In addition, this could be magnified when combined with low temperature cracking, one of the main distresses in AC pavements resulting from extreme temperature changes. When loading is applied near the joints or discontinuity, it amplifies the tensile stress at the bottom of the AC layer as well as the shear stress when the Portland cement concrete (PCC) slab or discontinuity moves vertically. Repetitive traffic loading and environmental changes cause continuous damage accumulations which consequently results in the acceleration of movement in the AC layer at the localized area close to the discontinuity region, thus leading to mechanical degradation of the AC materials which become less resistant to fracture. Even a small load can result in fracture failure of AC pavements when the loss of strength in AC pavements progresses significantly through repeated loading. The current approach to determine the critical properties of AC materials is to conduct laboratory testing under monotonic loading and cyclic loading separately. The fatigue testing under cyclic loading can only provide bulk material properties without consideration to any discontinuities, such as cracks in underlying pavement or joints. On the other hand, the current fracture tests conducted under monotonic loading fail to capture the loss of material strength as repeated loading is applied on pavements. For an accurate estimation of pavement life, it is essential to consider the effect of repeated traffic and thermal loading on the fracture resistance of the AC materials. This study investigates the degradation of the fracture resistance of AC materials as a result of the progressive damages caused by repeated loading application. The study develops the phenomenological constitutive model for fracture resistance degradation with damage growth caused by repeated loading. An experimental program was designed to apply monotonic and cyclic loading to the same test geometry and to examine the degradation of fracture properties with damage growth at the crack tip. Fracture and fatigue tests were implemented using semi-circular bending (SCB) test geometry with notched specimens at various temperatures, loading frequencies, and loading amplitudes. It is observed that damage functions and proposed parameters reflect the degradation rate of fracture resistance with respect to damage growth at the notch tip region. A presented constitutive model accurately predicts the remaining service life of existing pavements. It is further observed that the model coefficient distinguishes AC materials in terms of sensitivity… Advisors/Committee Members: Champaign%22%20%2Bcontributor%3A%28%22Al-Qadi%2C%20Imad%20L.%22%29&pagesize-30">Al-Qadi, Imad L. (advisor), Champaign%22%20%2Bcontributor%3A%28%22Al-Qadi%2C%20Imad%20L.%22%29&pagesize-30">Al-Qadi, Imad L. (Committee Chair), Champaign%22%20%2Bcontributor%3A%28%22Thompson%2C%20Marshall%20R.%22%29&pagesize-30">Thompson, Marshall R. (committee member), Champaign%22%20%2Bcontributor%3A%28%22Buttlar%2C%20William%20G.%22%29&pagesize-30">Buttlar, William G. (committee member), Champaign%22%20%2Bcontributor%3A%28%22Duarte%2C%20C.%20Armando%22%29&pagesize-30">Duarte, C. Armando (committee member), Champaign%22%20%2Bcontributor%3A%28%22Ozer%2C%20Hasan%22%29&pagesize-30">Ozer, Hasan (committee member).

Subjects/Keywords: Pavements; Asphalt Concrete; Fracture Resistance; Fatigue; Continuum Damage Model; Semi-Circular Bending Test

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Son, S. (2014). Development of a phenomenological constitutive model for fracture resistance degradation of asphalt concrete with damage growth due to repeated loading. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/49825

Chicago Manual of Style (16^th Edition):

Son, Songsu. “Development of a phenomenological constitutive model for fracture resistance degradation of asphalt concrete with damage growth due to repeated loading.” 2014. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed April 14, 2021. http://hdl.handle.net/2142/49825.

MLA Handbook (7^th Edition):

Son, Songsu. “Development of a phenomenological constitutive model for fracture resistance degradation of asphalt concrete with damage growth due to repeated loading.” 2014. Web. 14 Apr 2021.

Vancouver:

Son S. Development of a phenomenological constitutive model for fracture resistance degradation of asphalt concrete with damage growth due to repeated loading. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2014. [cited 2021 Apr 14]. Available from: http://hdl.handle.net/2142/49825.

Council of Science Editors:

Son S. Development of a phenomenological constitutive model for fracture resistance degradation of asphalt concrete with damage growth due to repeated loading. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2014. Available from: http://hdl.handle.net/2142/49825

University of Illinois – Urbana-Champaign

17. Hernandez, Jaime Alberto. Development of deformable tire-pavement interaction: contact stresses and rolling resistance prediction under various driving conditions.

Degree: PhD, Civil Engineering, 2015, University of Illinois – Urbana-Champaign

URL: http://hdl.handle.net/2142/89127

► Even though continuous improvements have been seen in the analysis of flexible pavements, one of the most important factors is still oversimplified: the tire. This… (more)

▼ Even though continuous improvements have been seen in the analysis of flexible pavements, one of the most important factors is still oversimplified: the tire. This can result in costly decisions, such as poor structural road design, incorrect damage prediction, and inappropriate adoption of maintenance/rehabilitation techniques. Moreover, accurate analysis of the tire-pavement system improves predictions of rolling resistance, fuel consumption, and greenhouse gas emissions. The main contribution of this research lies in the evaluation of tire and pavement as a semi-coupled system, assuming both are deformable bodies, while focusing on contact stresses, rolling resistance, and pavement responses. In addition to load and tire inflation pressure, temperature, speed, and rolling conditions were considered. A series of necessary advancements in the tire model, such as appropriate material characterization (hyperelastic and visco-hyperelastic), accurate geometry, and model validation using experimental measurements, were implemented. The experimental program provided information for validation (contact area, tire deflection, and contact stresses/loads). In addition, based on the experimental measurements, a procedure including analytical expression was proposed to predict the variation of the vertical and transverse contact loads along the contact length. Four tire finite element (FE) models having accurate geometry and material characterization were developed to predict contact stresses and rolling resistance force. First, a hyperelastic tire was used on a rigid surface to predict contact stresses under various rolling and loading conditions. Second, the influence of tire speed and temperature was investigated using a visco-hyperelastic tire rolling on rigid surface. Third, hyperelastic tire on deformable elastic body was used to assess the sensitivity of the contact stresses to the body's stiffness. Fourth, the relevance of surface temperature and tire speed was determined using a hyperelastic tire on a deformable viscoelastic body. Finally, the deformable tire and pavement model were integrated to evaluate critical pavement responses, rolling resistance force, and structure-induced rolling resistance. Vertical and transverse contact loads for all conditions and longitudinal contact stresses at full braking were successfully fitted to analytical expressions, thus easing their potential application in pavement analysis. Based on the hyperelastic tire FE results, the vertical contact stresses were unaffected by traveling speed and rolling condition, and the rolling condition mainly modified the longitudinal contact stresses. After altering the rubber component’s material model to visco-hyperelastic, the contact area increased 6.8% due to temperature and decreased 3.8% due to speed. In addition, longitudinal contact stresses were the most affected by temperature and speed: increments in peak value caused by speed were as high as 17%, and the reduction caused by temperature reached 33.1%. On the other hand,… Advisors/Committee Members: Champaign%22%20%2Bcontributor%3A%28%22Al-Qadi%2C%20Imad%20L%22%29&pagesize-30">Al-Qadi, Imad L (advisor), Champaign%22%20%2Bcontributor%3A%28%22Al-Qadi%2C%20Imad%20L%22%29&pagesize-30">Al-Qadi, Imad L (Committee Chair), Champaign%22%20%2Bcontributor%3A%28%22Little%2C%20Dallas%22%29&pagesize-30">Little, Dallas (committee member), Champaign%22%20%2Bcontributor%3A%28%22Masud%2C%20Arif%22%29&pagesize-30">Masud, Arif (committee member), Champaign%22%20%2Bcontributor%3A%28%22Ozer%2C%20Hasan%22%29&pagesize-30">Ozer, Hasan (committee member), Champaign%22%20%2Bcontributor%3A%28%22Radulescu%2C%20Robert%22%29&pagesize-30">Radulescu, Robert (committee member), Champaign%22%20%2Bcontributor%3A%28%22Thompson%2C%20Marshall%22%29&pagesize-30">Thompson, Marshall (committee member).

Subjects/Keywords: Tire-pavement interaction; pavement responses; rolling resistance; contact stresses; finite element modeling

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Hernandez, J. A. (2015). Development of deformable tire-pavement interaction: contact stresses and rolling resistance prediction under various driving conditions. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/89127

Chicago Manual of Style (16^th Edition):

Hernandez, Jaime Alberto. “Development of deformable tire-pavement interaction: contact stresses and rolling resistance prediction under various driving conditions.” 2015. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed April 14, 2021. http://hdl.handle.net/2142/89127.

MLA Handbook (7^th Edition):

Hernandez, Jaime Alberto. “Development of deformable tire-pavement interaction: contact stresses and rolling resistance prediction under various driving conditions.” 2015. Web. 14 Apr 2021.

Vancouver:

Hernandez JA. Development of deformable tire-pavement interaction: contact stresses and rolling resistance prediction under various driving conditions. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2015. [cited 2021 Apr 14]. Available from: http://hdl.handle.net/2142/89127.

Council of Science Editors:

Hernandez JA. Development of deformable tire-pavement interaction: contact stresses and rolling resistance prediction under various driving conditions. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2015. Available from: http://hdl.handle.net/2142/89127

University of Illinois – Urbana-Champaign

18. Abauwad, Ibrahim M. Mechanical and surface free energy characterization of asphalt concrete for moisture damage detection.

Degree: PhD, Civil Engineering, 2016, University of Illinois – Urbana-Champaign

URL: http://hdl.handle.net/2142/90813

► Moisture damage is defined as the degradation of the mechanical properties of asphalt concrete (AC) caused by moisture. Moisture damage causes a severe loss in… (more)

▼ Moisture damage is defined as the degradation of the mechanical properties of asphalt concrete (AC) caused by moisture. Moisture damage causes a severe loss in the strength and durability of asphalt pavements, leading to a major decrease in pavement performance. Hence, many additives are used to mitigate the effect of moisture on AC. The moisture sensitivity of AC depends on many factors, including aggregates, binders, and AC properties, environmental conditions (e.g., temperature and humidity), traffic loading, quality of construction, and pavement design. Many laboratory tests have been developed to understand and evaluate moisture damage. Laboratory tests are conducted at two levels, AC mixture and its components (binder and aggregate), using various conditioning procedures to introduce the effects of moisture. Current AC moisture susceptibility identification laboratory tests have three main drawbacks: limited ability of simulating environmental conditions, dependence of results on test conditioning process, and limited correlation between laboratory and field results. These shortcomings have compelled the need for the development of new tools to study moisture damage; especially at the component level. The main objective of this study is to predict the impact of several additives/modifiers and recycled asphalt pavement (RAP) on moisture susceptibility of AC at the mixture- and component-level. The impact was evaluated under different aging and conditioning levels. In addition, an assessment of the impact was performed within mixture-level tests and between mixture- and component-level tests. The study is focused primarily on investigating the effects of moisture on AC mixtures. Two AC mixes (in addition to selected additives and modifiers), typically used in the State of Illinois, were considered: 19.0-mm nominal maximum aggregate size (NMAS) binder mix and 19.0-mm NMAS mix with 50% RAP. The additives and modifiers consist of liquid anti-strip (LAS), hydrated lime (HL), styrene butadiene styrene (SBS), SBS with LAS, and polyphosphoric acid (PPA) with HL. The effects of the additives and modifiers on the moisture susceptibility of the proposed AC mixtures were evaluated through several mixture- and component-level tests. The mixture-level tests are the modified AASHTO T-283 and dynamic modulus tests. The surface free energy (SFE), direct adhesion test (DAT) and blister test (BT) represent the component-level types. Samples for the mixture-level tests were prepared at different aging and conditioning durations. Aging durations include one hour and four hours after mixing and prior to compaction; conditioning durations comprise one thawing cycle, three freezing and thawing (FT) cycles, and five FT cycles. Aging was also being considered at the component level by using the rolling thin film oven (RTFO) and pressure aging vessel (PAV). Each binder was tested at the virgin, RTFO, and PAV aging status. The results from modified AASHTO T-283 test indicate that LAS and HL improved moisture… Advisors/Committee Members: Champaign%22%20%2Bcontributor%3A%28%22Al-Qadi%2C%20Imad%22%29&pagesize-30">Al-Qadi, Imad (advisor), Champaign%22%20%2Bcontributor%3A%28%22Al-Qadi%2C%20Imad%22%29&pagesize-30">Al-Qadi, Imad (Committee Chair), Champaign%22%20%2Bcontributor%3A%28%22Buttlar%2C%20William%22%29&pagesize-30">Buttlar, William (committee member), Champaign%22%20%2Bcontributor%3A%28%22Harvey%2C%20John%22%29&pagesize-30">Harvey, John (committee member), Champaign%22%20%2Bcontributor%3A%28%22Thompson%2C%20Marshall%22%29&pagesize-30">Thompson, Marshall (committee member), Champaign%22%20%2Bcontributor%3A%28%22Ozer%2C%20%20Hasan%22%29&pagesize-30">Ozer, Hasan (committee member).

Subjects/Keywords: Moisture Damage; Component - Level testing; Mixture - Level testing; Lottman test; Dynamic Modulus Test; Surface Free Energy; Direct Adhesion Test; Blister Test; Aging; Conditioning; Freezing and Thawing Cycles; Rolling thin film oven (RTFO); Pressure aging vessel (PAV); Tensile stress ration (TSR); E* Ratio; Master Curve; Statistical Package for the Social Sciences (SPSS); Work of Adhesion; Work of Cohesion

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Abauwad, I. M. (2016). Mechanical and surface free energy characterization of asphalt concrete for moisture damage detection. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/90813

Chicago Manual of Style (16^th Edition):

Abauwad, Ibrahim M. “Mechanical and surface free energy characterization of asphalt concrete for moisture damage detection.” 2016. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed April 14, 2021. http://hdl.handle.net/2142/90813.

MLA Handbook (7^th Edition):

Abauwad, Ibrahim M. “Mechanical and surface free energy characterization of asphalt concrete for moisture damage detection.” 2016. Web. 14 Apr 2021.

Vancouver:

Abauwad IM. Mechanical and surface free energy characterization of asphalt concrete for moisture damage detection. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2016. [cited 2021 Apr 14]. Available from: http://hdl.handle.net/2142/90813.

Council of Science Editors:

Abauwad IM. Mechanical and surface free energy characterization of asphalt concrete for moisture damage detection. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2016. Available from: http://hdl.handle.net/2142/90813

University of Illinois – Urbana-Champaign

19. Yang, Rebekah Y. Development and implementation of comprehensive regionalized pavement life-cycle assessment.

Degree: PhD, Civil Engineering, 2017, University of Illinois – Urbana-Champaign

URL: http://hdl.handle.net/2142/97737

► The use of life-cycle assessment (LCA) to evaluate the environmental impacts of pavement systems is a topic that stakeholders in academia, industry, and government have… (more)

▼ The use of life-cycle assessment (LCA) to evaluate the environmental impacts of pavement systems is a topic that stakeholders in academia, industry, and government have actively engaged with in the last two decades. The LCA methodology aims to provide quantitative environmental metrics such as energy consumption and greenhouse gases regarding the cradle-to-grave impacts accumulated over the pavement’s life-cycle. While research progress has been made to improve the inventory data and models used in pavement LCA, the connectivity between development of the LCA, application of an LCA software, and interpretation of LCA results have not yet been thoroughly addressed. Thus, in order to further the practical utilization of pavement LCA, work must be done to evaluate how LCA consumers and decision makers can apply and interpret LCA results and how methodological issues may affect LCA results. The first portion of this dissertation concerns the compilation and application of regional life-cycle inventory data for initial pavement construction. Using data modeled to represent the Northern Illinois region, various pavement mixtures and pay item activities are evaluated for initial environmental impacts due to material production and construction processes. To address the limitations in possessing only partial LCA impacts, a scenario-based analysis is used to consider the effect of future pavement performance on life-cycle environmental impacts. In addition, economic impacts are also calculated for mixes and pay items, and a cost-effectiveness analysis is conducted to expand the pay item environmental assessment into a useful set of metrics for agencies. Building upon the inventory data compiled, a full LCA framework and software is then implemented. The roadway/roadside software is designed to consider each life-cycle stage (i.e., materials and construction, maintenance and rehabilitation, use, and end-of-life) of major roadway/roadside elements including drainage, landscape, lighting, pavement, and structures using pay items to facilitate agency utilization. A set of fourteen diverse pavement construction contracts are analyzed using the LCA software and their results are visualized and interpreted as relevant to transportation agencies. The final portion of this dissertation evaluates key interpretation issues related to pavement LCA. A series of sensitivity analyses are performed on major methodological choices to determine which decisions and parameters ultimately have a significant effect on the overall LCA results. Furthermore, two methods for incorporating uncertainty into the LCA are also implemented - one using a simplistic probabilistic approach and the other using an informed Bayesian updating approach. The effects of considering data uncertainty in LCA, especially for comparative analyses, are addressed. Advisors/Committee Members: Champaign%22%20%2Bcontributor%3A%28%22Al-Qadi%2C%20Imad%20L%22%29&pagesize-30">Al-Qadi, Imad L (advisor), Champaign%22%20%2Bcontributor%3A%28%22Al-Qadi%2C%20Imad%20L%22%29&pagesize-30">Al-Qadi, Imad L (Committee Chair), Champaign%22%20%2Bcontributor%3A%28%22Harvey%2C%20John%22%29&pagesize-30">Harvey, John (committee member), Champaign%22%20%2Bcontributor%3A%28%22Ouyang%2C%20Yanfeng%22%29&pagesize-30">Ouyang, Yanfeng (committee member), Champaign%22%20%2Bcontributor%3A%28%22Ozer%2C%20Hasan%22%29&pagesize-30">Ozer, Hasan (committee member), Champaign%22%20%2Bcontributor%3A%28%22Roesler%2C%20Jeffery%22%29&pagesize-30">Roesler, Jeffery (committee member).

Subjects/Keywords: Life-cycle assessment; Pavement; Highway construction; Environmental impacts

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Yang, R. Y. (2017). Development and implementation of comprehensive regionalized pavement life-cycle assessment. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/97737

Chicago Manual of Style (16^th Edition):

Yang, Rebekah Y. “Development and implementation of comprehensive regionalized pavement life-cycle assessment.” 2017. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed April 14, 2021. http://hdl.handle.net/2142/97737.

MLA Handbook (7^th Edition):

Yang, Rebekah Y. “Development and implementation of comprehensive regionalized pavement life-cycle assessment.” 2017. Web. 14 Apr 2021.

Vancouver:

Yang RY. Development and implementation of comprehensive regionalized pavement life-cycle assessment. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2017. [cited 2021 Apr 14]. Available from: http://hdl.handle.net/2142/97737.

Council of Science Editors:

Yang RY. Development and implementation of comprehensive regionalized pavement life-cycle assessment. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2017. Available from: http://hdl.handle.net/2142/97737

University of Illinois – Urbana-Champaign

20. Yousefi, Seyed Saleh. Model development and validation of bituminous-based crack sealants.

Degree: PhD, Civil Engineering, 2019, University of Illinois – Urbana-Champaign

URL: http://hdl.handle.net/2142/104853

► A wide spectrum of sealant types commonly used in the United States were installed in eight different test sites using two types of sealing treatment… (more)

▼ A wide spectrum of sealant types commonly used in the United States were installed in eight different test sites using two types of sealing treatment techniques. The performance of sealants was monitored after each winter for three years to determine a performance index (PI) consisting primarily of adhesive, cohesive, and overband wear. Field samples were collected from the sites to conduct laboratory testing and validate the sealant grading system. According to the field results, most sealants failed below a PI threshold of 70% after three years. In general, rout and seal sections performed better than the clean and seal sections. Field performance results highlighted the importance of test site selection, especially for clean and seal application. Statistical correlations of tests parameters with the field performance were performed. A composite score approach, combining ranking and correlation, was used to develop a quantitative scale for determining the level of acceptance. Based on the composite score, a strong or acceptable correlation was obtained between field performance and laboratory test parameters for field test sites. After confirming the correlation between field performance and lab results, the thresholds for test method were selected or fine-tuned. In addition to test methods validation, an investigation was also conducted to evaluate the short-term and long-term aging effects of hot-poured crack sealants through a differential aging test. Rheological and mechanical properties of sealants at different aging stages were monitored to characterize the aging effects. Laboratory aging of sealants was studied using three different aging methods: Kettle aging, melter aging, and vacuum oven aging (VOA). The aging index was used to evaluate the effect of these aging methods. Comparing the stiffness master curves obtained from the crack sealant bending beam rheometer (CSBBR) test for field-aged samples and laboratory-aged samples, VOA was validated as a reasonable aging method for simulating two-five years of field aging. Finally, sealant rheological, mechanical and chemical properties were analyzed, implementing different performance-based tests and FTIR test to characterize sealants aging. A set of eight types of crack sealants was exposed to approximately four years of weathering conditions. Aging mechanisms were investigated by comparing the critical properties with those obtained at the time of installation inside a small kettle. Samples were collected every six months after installation for laboratory characterization. Laboratory characterization includes low temperature stiffness, high temperature modulus, viscosity, and FTIR spectrum. According to the results of the experimental program, a consistent increase was observed in the low temperature stiffness and high temperature shear modulus of crack sealants due to weathering. The study showed that the low- and high-temperature properties of surface portion are significantly influenced by weathering effects even within a short period of life time. A… Advisors/Committee Members: Champaign%22%20%2Bcontributor%3A%28%22Al-Qadi%2C%20Imad%22%29&pagesize-30">Al-Qadi, Imad (advisor), Champaign%22%20%2Bcontributor%3A%28%22Al-Qadi%2C%20Imad%22%29&pagesize-30">Al-Qadi, Imad (Committee Chair), Champaign%22%20%2Bcontributor%3A%28%22Thompson%2C%20Marshall%22%29&pagesize-30">Thompson, Marshall (committee member), Champaign%22%20%2Bcontributor%3A%28%22Tutumluer%2C%20Erol%22%29&pagesize-30">Tutumluer, Erol (committee member), Champaign%22%20%2Bcontributor%3A%28%22Ozer%2C%20Hasan%22%29&pagesize-30">Ozer, Hasan (committee member), Champaign%22%20%2Bcontributor%3A%28%22Sharma%2C%20BK%22%29&pagesize-30">Sharma, BK (committee member).

Subjects/Keywords: Hot-Poured Crack Sealant; Rheology; Aging; DSR; BBR; AASHTO; FTIR; pavement preservation; Asphalt

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Yousefi, S. S. (2019). Model development and validation of bituminous-based crack sealants. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/104853

Chicago Manual of Style (16^th Edition):

Yousefi, Seyed Saleh. “Model development and validation of bituminous-based crack sealants.” 2019. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed April 14, 2021. http://hdl.handle.net/2142/104853.

MLA Handbook (7^th Edition):

Yousefi, Seyed Saleh. “Model development and validation of bituminous-based crack sealants.” 2019. Web. 14 Apr 2021.

Vancouver:

Yousefi SS. Model development and validation of bituminous-based crack sealants. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2019. [cited 2021 Apr 14]. Available from: http://hdl.handle.net/2142/104853.

Council of Science Editors:

Yousefi SS. Model development and validation of bituminous-based crack sealants. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2019. Available from: http://hdl.handle.net/2142/104853

University of Illinois – Urbana-Champaign

21. Ziyadi, Mojtaba. Uncertainty quantification for pavement life-cycle stages.

Degree: PhD, Civil Engineering, 2017, University of Illinois – Urbana-Champaign

URL: http://hdl.handle.net/2142/99231

► Life-cycle assessment (LCA), a common sustainability metric, is usually adopted to quantify the environmental consequences of a product. It has been shown that rolling resistance… (more)

▼ Life-cycle assessment (LCA), a common sustainability metric, is usually adopted to quantify the environmental consequences of a product. It has been shown that rolling resistance (RR), a major component of pavement LCA use stage, has significant impact on transportation-related energy consumption. Pavement related RR mainly includes pavement structure, surface roughness (or smoothness) and texture. This research aims at addressing current challenges in pavement LCA use stage. A robust framework is proposed to evaluate RR via developing models for pavement roughness- and structural-induced RR. A roughness–speed impact (RSI) model was developed to quantify the energy and environmental impacts due to RR. The model uses vehicle-specific power as part of the pavement–vehicle interaction (PVI) analysis. According to the model, one unit change of IRI (1 m/km) results in 3% and 2% fuel consumption, respectively, at high and low speeds (105 and 56 km/h) for passenger cars. In addition to the RSI model, the study proposes a practical approach to assess the vehicle excess fuel consumption (EFC) due to pavement deflection. The developed relationship relies on the fundamental energy-deformation principles obtained by conducting nonlinear regression analysis on 3-D finite element (FE) simulations. The proposed model is formulated using a quadratic form of maximum pavement deflection. Factors affect EFC includes, truck loading and speed and pavement temperature. It was found that the estimated EFC for a heavy truck could be as low as 0.03% for a half loaded truck at a temperature of 0 °C a speed of 115 km/h and as high as 6.5% for a fully loaded truck at a temperature of 40 °C and a speed of 8 km/h. This could be increased for low volume road pavement structure. At a speed of 100 km/h, a typical HS20-44 truck could consume an additional 0.5% fuel due to structural rolling resistance (SRR). Uncertainty of pavement roughness has significant impact on the energy and emission output of the pavement-vehicle system depending on the precision level of the model used, input variabilities, and prior knowledge of the model parameters. When quantified uncertainties, successfully utilized in this study, are implemented, LCA parameters prediction would be improved. The introduced RR models may be used as part of the decision-making for short-term energy and emission reduction policies. Advisors/Committee Members: Champaign%22%20%2Bcontributor%3A%28%22Al-Qadi%2C%20Imad%22%29&pagesize-30">Al-Qadi, Imad (advisor), Champaign%22%20%2Bcontributor%3A%28%22Al-Qadi%2C%20Imad%22%29&pagesize-30">Al-Qadi, Imad (Committee Chair), Champaign%22%20%2Bcontributor%3A%28%22Harvey%2C%20John%22%29&pagesize-30">Harvey, John (committee member), Champaign%22%20%2Bcontributor%3A%28%22Birgisson%2C%20Bjorn%22%29&pagesize-30">Birgisson, Bjorn (committee member), Champaign%22%20%2Bcontributor%3A%28%22Ouyang%2C%20Yanfeng%22%29&pagesize-30">Ouyang, Yanfeng (committee member), Champaign%22%20%2Bcontributor%3A%28%22Meidani%2C%20Hadi%22%29&pagesize-30">Meidani, Hadi (committee member), Champaign%22%20%2Bcontributor%3A%28%22Ozer%2C%20Hasan%22%29&pagesize-30">Ozer, Hasan (committee member).

Subjects/Keywords: Uncertainty quantification; Sustainability; Life-cycle assessment; Pavement; Rolling resistance; Machine learning; Roughness; Deflection-induced energy; Excess energy; Emissions

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Ziyadi, M. (2017). Uncertainty quantification for pavement life-cycle stages. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/99231

Chicago Manual of Style (16^th Edition):

Ziyadi, Mojtaba. “Uncertainty quantification for pavement life-cycle stages.” 2017. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed April 14, 2021. http://hdl.handle.net/2142/99231.

MLA Handbook (7^th Edition):

Ziyadi, Mojtaba. “Uncertainty quantification for pavement life-cycle stages.” 2017. Web. 14 Apr 2021.

Vancouver:

Ziyadi M. Uncertainty quantification for pavement life-cycle stages. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2017. [cited 2021 Apr 14]. Available from: http://hdl.handle.net/2142/99231.

Council of Science Editors:

Ziyadi M. Uncertainty quantification for pavement life-cycle stages. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2017. Available from: http://hdl.handle.net/2142/99231

University of Illinois – Urbana-Champaign

22. Evangelista, Francisco, Jr. Three-dimensional modeling of failure in quasi-brittle materials and structures.

Degree: PhD, 0106, 2012, University of Illinois – Urbana-Champaign

URL: http://hdl.handle.net/2142/29543

► In most serviceability conditions, concrete structures present quasi-brittle behavior and failure due to the presence of a nonlinear fracture process zone ahead of the crack… (more)

▼ In most serviceability conditions, concrete structures present quasi-brittle behavior and failure due to the presence of a nonlinear fracture process zone ahead of the crack front. Predictive models and design methodologies have to be able to reliably calculate the load capacity, or structural strength, of structures while taking into account the nonlinearity of the material behavior and the consideration of realistic boundary conditions such as geometry, size, and loading configuration. The main objective of this study is to develop models and to apply numerical tools to predict the cracking potential in three-dimensional concrete structures. Firstly, a cohesive zone model is formulated and implemented to simulate mode I crack growth in quasi-brittle materials based on the thermodynamics of irreversible processes allowing for loading, unloading, and re-loading. The model is a step forward to improve existing cohesive zone formulations to consider three-dimensional geometries and also overcome numerical instability, lack of convergence, and oscillations in the traction profile commonly reported in cohesive models. This study also explores the novel computational framework of the generalized finite element method (GFEM) to predict the potential for crack propagation in large scale problems such as three-dimensional airfield concrete slabs. A multi-scale approach, using the global-local concept within the GFEM framework (GFEMg-l), is applied to multi-site damage problems (MSD), where several crack geometries are placed simultaneously at different positions in a slab and loaded by different aircraft gears. This approach efficiently simulates multiple cracks not discretized in the global mesh, but only modeled in the local problem domains. The GFEMg-l enrichment functions allow the kinematics to be represented in the global domain through enrichment function from the local problems rather than explicitly modeling each crack discretely in the global domain. This research effort also proposes an integrated approach called nonlinear strength fracture model (NLSFM) to predict the structural strength or load capacity of three-dimensional concrete structures considering the structure geometry, loading configuration, and the nonlinearities ahead of the crack front. In this approach, the extraction of crack front quantities, such as stress intensity factors, are performed through finite element analysis, and then a high-order approximation based on the equivalent elastic crack approach for quasi-brittle materials accounts for the FPZ effects on the nominal strength of the structure under mode I fracture. The NLSFM uses the size- and shape-independent fracture properties defined through the critical energy release rate, Gf, and size of fracture process zone, c (as provided by the two-parameter fracture model and size effect model for quasi-brittle materials). As a result, the model predicts a material independent strength-curve, given the structural geometry, boundary conditions, loading, initial crack length are… Advisors/Committee Members: Champaign%22%20%2Bcontributor%3A%28%22Roesler%2C%20Jeffery%20R.%22%29&pagesize-30">Roesler, Jeffery R. (advisor), Champaign%22%20%2Bcontributor%3A%28%22Duarte%2C%20C.%20Armando%22%29&pagesize-30">Duarte, C. Armando (committee member), Champaign%22%20%2Bcontributor%3A%28%22Al-Qadi%2C%20Imad%20L.%22%29&pagesize-30">Al-Qadi, Imad L. (committee member), Champaign%22%20%2Bcontributor%3A%28%22Lambros%2C%20John%22%29&pagesize-30">Lambros, John (committee member).

Subjects/Keywords: fracture mechanics, cohesive zone model; quasi-brittle materials, concrete materials; three-dimensional modeling; multi-scale modeling

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Evangelista, Francisco, J. (2012). Three-dimensional modeling of failure in quasi-brittle materials and structures. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/29543

Chicago Manual of Style (16^th Edition):

Evangelista, Francisco, Jr. “Three-dimensional modeling of failure in quasi-brittle materials and structures.” 2012. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed April 14, 2021. http://hdl.handle.net/2142/29543.

MLA Handbook (7^th Edition):

Evangelista, Francisco, Jr. “Three-dimensional modeling of failure in quasi-brittle materials and structures.” 2012. Web. 14 Apr 2021.

Vancouver:

Evangelista, Francisco J. Three-dimensional modeling of failure in quasi-brittle materials and structures. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2012. [cited 2021 Apr 14]. Available from: http://hdl.handle.net/2142/29543.

Council of Science Editors:

Evangelista, Francisco J. Three-dimensional modeling of failure in quasi-brittle materials and structures. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2012. Available from: http://hdl.handle.net/2142/29543

University of Illinois – Urbana-Champaign

23. Kazmee, Hasan. Performance evaluation of unconventional aggregates from primary and recycled sources for construction platform and low volume road applications.

Degree: PhD, Civil Engineering, 2018, University of Illinois – Urbana-Champaign

URL: http://hdl.handle.net/2142/101130

► Unbound aggregate layers are frequently used as remedial alternatives for weak subgrade soils. With the recent focus on sustainable construction practices, ever-increasing transportation cost, and… (more)

▼ Unbound aggregate layers are frequently used as remedial alternatives for weak subgrade soils. With the recent focus on sustainable construction practices, ever-increasing transportation cost, and scarcity of natural resources, nontraditional and locally available recycled materials have become viable for the construction of unsurfaced and low volume roads. Although large-size unconventional virgin aggregates (also referred to as ‘rock cap’, ‘primary crusher run’ and ‘macadam stone base’) have been successfully used by several transportation agencies previously, performances of recycled materials, e.g. reclaimed asphalt pavement (RAP) and recycled concrete aggregate (RCA) with possible large particle sizes, are not readily available in current engineering literature. The main objective of this research study was to evaluate engineering applications and field performances of unconventional aggregates from virgin and recycled sources used in both construction platform type pavement foundation and low volume road applications. A total of seven different aggregate materials varying in particle size distributions and material compositions were selected for this study. Since conventional laboratory testing could not accommodate engineering property characterizations and performance evaluations of large size unconventional aggregates, a field evaluation study was essentially undertaken involving accelerated pavement testing of twelve full-scale working platform and twelve asphalt concrete surfaced low volume road test sections constructed with the aforementioned materials. Regular base course type virgin crushed dolomite and 100% reclaimed asphalt pavement (RAP) materials were used as a thin capping layer to limit the movement of large particles over weak subgrade condition. Among the 24 test sections, 16 test sections comprising of large rocks were constructed over an engineered subgrade with a California bearing ratio (CBR) of 1%; meanwhile, the remaining 8 test sections were built with regular size dense-graded base course aggregates over a modified subgrade with a design strength of CBR = 3%. Considering the dimension-specific requirements of standardized test protocols, limited laboratory characterization tests could be conducted to evaluate the physical and mechanical properties of selected aggregate materials. A state of the art field imaging technique was adopted to measure the size and shape properties of these large size, so-called ‘aggregate subgrade’ materials. For the virgin aggregates, imaging-based angularity and surface texture indices were found to increase when particles sizes were mechanically reduced through the aggregate crushing effort from primary to tertiary stage quarry processes. Conversely, RAP materials had comparatively lower angularity and surface texture owing to the presence of asphalt binder coating around those particles. Visual observations and laboratory test results indicated that uniformly graded large size aggregates underwent significant particle reorientation during the monotonic… Advisors/Committee Members: Champaign%22%20%2Bcontributor%3A%28%22Tutumluer%2C%20Erol%22%29&pagesize-30">Tutumluer, Erol (advisor), Champaign%22%20%2Bcontributor%3A%28%22Tutumluer%2C%20Erol%22%29&pagesize-30">Tutumluer, Erol (Committee Chair), Champaign%22%20%2Bcontributor%3A%28%22Al-Qadi%2C%20Imad%22%29&pagesize-30">Al-Qadi, Imad (committee member), Champaign%22%20%2Bcontributor%3A%28%22Thompson%2C%20Marshall%22%29&pagesize-30">Thompson, Marshall (committee member), Champaign%22%20%2Bcontributor%3A%28%22Roesler%2C%20Jeffery%22%29&pagesize-30">Roesler, Jeffery (committee member), Champaign%22%20%2Bcontributor%3A%28%22Mishra%2C%20Debakanta%22%29&pagesize-30">Mishra, Debakanta (committee member).

Subjects/Keywords: Unbound granular layer; aggregate; low volume roads; accelerated pavement testing; rutting; falling weight deflectometer; large-scale triaxial testing

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Kazmee, H. (2018). Performance evaluation of unconventional aggregates from primary and recycled sources for construction platform and low volume road applications. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/101130

Chicago Manual of Style (16^th Edition):

Kazmee, Hasan. “Performance evaluation of unconventional aggregates from primary and recycled sources for construction platform and low volume road applications.” 2018. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed April 14, 2021. http://hdl.handle.net/2142/101130.

MLA Handbook (7^th Edition):

Kazmee, Hasan. “Performance evaluation of unconventional aggregates from primary and recycled sources for construction platform and low volume road applications.” 2018. Web. 14 Apr 2021.

Vancouver:

Kazmee H. Performance evaluation of unconventional aggregates from primary and recycled sources for construction platform and low volume road applications. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2018. [cited 2021 Apr 14]. Available from: http://hdl.handle.net/2142/101130.

Council of Science Editors:

Kazmee H. Performance evaluation of unconventional aggregates from primary and recycled sources for construction platform and low volume road applications. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2018. Available from: http://hdl.handle.net/2142/101130

University of Illinois – Urbana-Champaign

24. Sarker, Priyanka. Analyses and prediction of granular layer rutting trends in airport pavements due to heavy aircraft wheel loading and wander patterns.

Degree: PhD, Civil Engineering, 2020, University of Illinois – Urbana-Champaign

URL: http://hdl.handle.net/2142/107949

► This study focuses on establishing a better understanding of the combined influences of various aircraft with complex gear configuration and the gear load wanders on… (more)

▼ This study focuses on establishing a better understanding of the combined influences of various aircraft with complex gear configuration and the gear load wanders on the rut (i.e., permanent deformation) accumulation in unbound layers of airfield flexible pavement. As such, the challenge is to investigate and propose proper rut prediction models that can capture such influences from full-scale accelerated pavement test studies. This was achieved by studying pavement test sections constructed and full scale pavement tested at Federal Aviation Administration’s (FAA’s) National Airport Pavement Test Facility in New Jersey. Referred to herein as the Construction Cycle 5 (CC5) experiment, CC5 sections were built with different subbase materials (crushed quarry screenings and dense graded aggregates) with varying thicknesses over a low-strength subgrade and were trafficked by six-wheel and 10-wheel landing gears with wander. These pavement sections were instrumented with various sensors such as multi-depth deflectometer (MDD), pressure sensor, and asphalt strain gauge. The MDD sensors provided the most valuable data for this research since both elastic (or resilient) and plastic deformation response values of individual layers were measured in the pavement system due to the passages of both six-wheel and 10-wheel landing gears applied with wander. Analyses of the MDD data indicated that the effects of load wander were evident on the residual (non-recoverable) deformation accumulations because changes in wander locations influenced the directional nature (either upward or downward) of residual deformation values. The residual deformation data separation showed that the first pass on each wander position in the west to east direction typically caused the highest deformation response and the return pass along the same wander position showed significantly less residual deformation. This finding clearly indicated the presence of the so-called shakedown effect with load wander governing the behavior of unbound aggregate layers. Also, it was noted that shakedown was more readily happening when the wander width was kept narrow. Especially in the 6-wheel sections, the residual deformations were not increasing much due to increased traffic. An observation was made to clearly show the presence of anti-shakedown in granular layers subjected to loading with wander by calculating individual pavement layer permanent deformation values with traffic passes from the MDD sensor collected data at the MDD location. It was observed that in all cases for all the available sections, the contribution of rutting from the rather thick subbase layers (34 and 38 in.) were significant when compared to those of the other layers. Furthermore, accumulations of permanent deformation in subbase layers did not slow down but rather increased as traffic progressed. This phenomenon contradicted the shakedown theory according to which all unbound layers are expected to undergo shakedown with increasing traffic. Post traffic trenching study showed that the… Advisors/Committee Members: Champaign%22%20%2Bcontributor%3A%28%22Tutumluer%2C%20Erol%22%29&pagesize-30">Tutumluer, Erol (advisor), Champaign%22%20%2Bcontributor%3A%28%22Tutumluer%2C%20Erol%22%29&pagesize-30">Tutumluer, Erol (Committee Chair), Champaign%22%20%2Bcontributor%3A%28%22Al-Qadi%2C%20Imad%20L%22%29&pagesize-30">Al-Qadi, Imad L (committee member), Champaign%22%20%2Bcontributor%3A%28%22Roesler%2C%20Jeffery%20R%22%29&pagesize-30">Roesler, Jeffery R (committee member), Champaign%22%20%2Bcontributor%3A%28%22Thompson%2C%20Marshall%20R%22%29&pagesize-30">Thompson, Marshall R (committee member), Champaign%22%20%2Bcontributor%3A%28%22Garg%2C%20Navneet%22%29&pagesize-30">Garg, Navneet (committee member).

Subjects/Keywords: Airport pavements; Rutting; Unbound granular layer; Accelerated pavement testing; Rut predictions; Statistical modeling; Performance based evaluation; Load wander; Multi-depth deflectometer (MDD); NAPTF

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Sarker, P. (2020). Analyses and prediction of granular layer rutting trends in airport pavements due to heavy aircraft wheel loading and wander patterns. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/107949

Chicago Manual of Style (16^th Edition):

Sarker, Priyanka. “Analyses and prediction of granular layer rutting trends in airport pavements due to heavy aircraft wheel loading and wander patterns.” 2020. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed April 14, 2021. http://hdl.handle.net/2142/107949.

MLA Handbook (7^th Edition):

Sarker, Priyanka. “Analyses and prediction of granular layer rutting trends in airport pavements due to heavy aircraft wheel loading and wander patterns.” 2020. Web. 14 Apr 2021.

Vancouver:

Sarker P. Analyses and prediction of granular layer rutting trends in airport pavements due to heavy aircraft wheel loading and wander patterns. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2020. [cited 2021 Apr 14]. Available from: http://hdl.handle.net/2142/107949.

Council of Science Editors:

Sarker P. Analyses and prediction of granular layer rutting trends in airport pavements due to heavy aircraft wheel loading and wander patterns. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2020. Available from: http://hdl.handle.net/2142/107949

University of Illinois – Urbana-Champaign

25. Behnia, Behzad. An acoustic emission-based test to evaluate low temperature behavior of asphalt materials.

Degree: PhD, 0106, 2013, University of Illinois – Urbana-Champaign

URL: http://hdl.handle.net/2142/45584

► Low temperature cracking in asphalt pavements located in cold climates is a major cause of pavement deterioration. Accurate evaluation of low temperature cracking behavior of… (more)

Subjects/Keywords: Acoustic emission; Thermal cracking; Asphalt material; Non-destructive testing (NDT)

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Behnia, B. (2013). An acoustic emission-based test to evaluate low temperature behavior of asphalt materials. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/45584

Chicago Manual of Style (16^th Edition):

Behnia, Behzad. “An acoustic emission-based test to evaluate low temperature behavior of asphalt materials.” 2013. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed April 14, 2021. http://hdl.handle.net/2142/45584.

MLA Handbook (7^th Edition):

Behnia, Behzad. “An acoustic emission-based test to evaluate low temperature behavior of asphalt materials.” 2013. Web. 14 Apr 2021.

Vancouver:

Behnia B. An acoustic emission-based test to evaluate low temperature behavior of asphalt materials. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2013. [cited 2021 Apr 14]. Available from: http://hdl.handle.net/2142/45584.

Council of Science Editors:

Behnia B. An acoustic emission-based test to evaluate low temperature behavior of asphalt materials. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2013. Available from: http://hdl.handle.net/2142/45584

University of Illinois – Urbana-Champaign

26. Na Chiangmai, Chaiwat. Experimental evaluation of monotonic and cyclic fracture behavior using disk-shaped compact tension test and released energy approach.

Degree: PhD, 0106, 2015, University of Illinois – Urbana-Champaign

URL: http://hdl.handle.net/2142/73043

► This thesis involves the evaluation of fracture behavior of asphalt concrete under monotonic and cyclic loading using the disk-shaped compact tension (DC(T)) test and a… (more)

▼ This thesis involves the evaluation of fracture behavior of asphalt concrete under monotonic and cyclic loading using the disk-shaped compact tension (DC(T)) test and a released-energy based approach. The standard DC(T) test was revised to facilitate both monotonic and cyclic loading tests, including some modifications of the test geometry and testing modes. The research was motivated to explore possible extensions of the DC(T) test device to consider cyclic fracture phenomena such as cyclic thermal cracking, block cracking and reflective cracking. Five different asphalt concrete mixtures were tested for both loading mechanisms across four test temperatures (-12, 0, 10, and 20 °C). After an extensive exploratory stage, the load-controlled testing mode utilizing a sine waveform and a frequency of 0.5 Hz with no rest period were selected as the main testing parameters for this study. In addition, peak load obtained from the monotonic DC(T) test was used as a reference value for determining loading magnitudes of the cyclic DC(T) test for a given mixture and test temperature. For data analysis, the released energy approach was introduced as a key concept to characterize the cyclic fracture data generated in this study. Stemming from this approach, a released energy rate parameter, R2, was identified with the characteristic of mixture and temperature independence. By correlating a fracture energy parameter (Gf) to released energy rate (R2), cyclic loading behavior could be predicted based upon three different data sets deriving from the DC(T) test: one involving a comprehensive cyclic loading testing suite; a slightly simpler method involving a limited number of required cyclic tests, and; a highly simplified approach where cyclic fracture behavior was predicted form monotonic fracture test results alone (standard DC(T) fracture energy). All three prediction methods were shown to be plausible, but as expected, the more rigorous the testing suite, the more accurate the prediction. Furthermore, monotonic and cyclic fracture behaviors were monitored using a webcam-based imaging technique to investigate fracture processes at a macro-scale level. As a result, each stage of cracking, including crack initiation and crack propagation, could be potentially predicted based on the cyclic test data through a relation of the crack initiation to number of cycles to a failure and crack propagation ratios, respectively. Advisors/Committee Members: Champaign%22%20%2Bcontributor%3A%28%22Buttlar%2C%20William%20G.%22%29&pagesize-30">Buttlar, William G. (advisor), Champaign%22%20%2Bcontributor%3A%28%22Buttlar%2C%20William%20G.%22%29&pagesize-30">Buttlar, William G. (Committee Chair), Champaign%22%20%2Bcontributor%3A%28%22Al-Qadi%2C%20Imad%20L.%22%29&pagesize-30">Al-Qadi, Imad L. (committee member), Champaign%22%20%2Bcontributor%3A%28%22Thompson%2C%20Marshall%20R.%22%29&pagesize-30">Thompson, Marshall R. (committee member), Champaign%22%20%2Bcontributor%3A%28%22Dave%2C%20Eshan%20V.%22%29&pagesize-30">Dave, Eshan V. (committee member).

Subjects/Keywords: Monotonic Fracture; Cyclic Fracture; Released Energy; disk-shaped compact tension (DC(T)) Test; Fatigue Test

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Na Chiangmai, C. (2015). Experimental evaluation of monotonic and cyclic fracture behavior using disk-shaped compact tension test and released energy approach. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/73043

Chicago Manual of Style (16^th Edition):

Na Chiangmai, Chaiwat. “Experimental evaluation of monotonic and cyclic fracture behavior using disk-shaped compact tension test and released energy approach.” 2015. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed April 14, 2021. http://hdl.handle.net/2142/73043.

MLA Handbook (7^th Edition):

Na Chiangmai, Chaiwat. “Experimental evaluation of monotonic and cyclic fracture behavior using disk-shaped compact tension test and released energy approach.” 2015. Web. 14 Apr 2021.

Vancouver:

Na Chiangmai C. Experimental evaluation of monotonic and cyclic fracture behavior using disk-shaped compact tension test and released energy approach. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2015. [cited 2021 Apr 14]. Available from: http://hdl.handle.net/2142/73043.

Council of Science Editors:

Na Chiangmai C. Experimental evaluation of monotonic and cyclic fracture behavior using disk-shaped compact tension test and released energy approach. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2015. Available from: http://hdl.handle.net/2142/73043

University of Illinois – Urbana-Champaign

27. Moreu-Alonso, Fernando. Framework for risk-based management and safety of railroad bridge infrastructure using wireless smart sensors (WSS).

Degree: PhD, Civil Engineering, 2015, University of Illinois – Urbana-Champaign

URL: http://hdl.handle.net/2142/78448

► To increase overall profitability, add capacity to rail operations to meet projected needs, and comply with new federal regulations on bridge safety, North American railroads… (more)

▼ To increase overall profitability, add capacity to rail operations to meet projected needs, and comply with new federal regulations on bridge safety, North American railroads are exploring means and methods to improve the management of their bridge networks. Current maintenance, repair, and replacement (MRR) decisions are informed by bridge inspections and ratings. Inspection and rating practices recommend observing the response of bridges under revenue traffic. However, an objective relationship between bridge responses and the impact to railroad operations has yet to be established. Moreover, measuring responses while trains are on the bridge can be quite challenging and sometimes may not be possible. As a result, current MRR decisions are not optimal and in general conservative, prioritizing safety to overcome the uncertainty of consequences of inaction. If the consequences of MRR decisions could be better determined, then the railroads could more effectively allocate their limited resources. This dissertation addresses this issue by developing an approach for consequence-based management of bridge networks, adopted from the field of seismic risk assessment, for making MRR decisions on a network-wide basis. The proposed framework assesses bridge service state condition based on fragility relations. Fragility curves are developed relating bridge responses under revenue service traffic to service condition limit states. Additionally, this research conducted specific Structural Health Monitoring (SHM) campaigns for railroad bridges employing Wireless Smart Sensors (WSS). Wireless strain gages installed in the rail measured real-time trainloads and speeds, while wireless accelerometers and magnetic strain gages measured associated bridge responses. The sensing system was deployed and validated on multiple railroad bridges in North America under different types of traffic and capacity. The measured bridge data can be used to update periodically the fragilities to have more accurate estimates of the bridge condition. The expenses associated with these service conditions estimate the total costs of a given MRR policy. In this way, MRR decisions can be prioritized minimizing negative consequences to railroad operations. This framework provides a consistent approach for intelligent management of railroad bridges, and more specifically, for the prioritization of railroad bridge MRR decisions. Using this framework the rail owner can identify the most efficient use of a limited budget while maintaining safe railroad operations. Advisors/Committee Members: Champaign%22%20%2Bcontributor%3A%28%22Spencer%2C%20Billie%20F.%2C%20Jr.%22%29&pagesize-30">Spencer, Billie F., Jr. (advisor), Champaign%22%20%2Bcontributor%3A%28%22Spencer%2C%20Billie%20F.%2C%20Jr.%22%29&pagesize-30">Spencer, Billie F., Jr. (Committee Chair), Champaign%22%20%2Bcontributor%3A%28%22LaFave%2C%20James%20M.%22%29&pagesize-30">LaFave, James M. (committee member), Champaign%22%20%2Bcontributor%3A%28%22Foutch%2C%20Douglas%20A.%22%29&pagesize-30">Foutch, Douglas A. (committee member), Champaign%22%20%2Bcontributor%3A%28%22Al-Qadi%2C%20Imad%20L.%22%29&pagesize-30">Al-Qadi, Imad L. (committee member), Champaign%22%20%2Bcontributor%3A%28%22Scola%2C%20Sandro%22%29&pagesize-30">Scola, Sandro (committee member).

Subjects/Keywords: railroad bridges; structural health monitoring; bridge maintenance; monitoring; fragility; decision making; assessment; wireless smart sensors

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Moreu-Alonso, F. (2015). Framework for risk-based management and safety of railroad bridge infrastructure using wireless smart sensors (WSS). (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/78448

Chicago Manual of Style (16^th Edition):

Moreu-Alonso, Fernando. “Framework for risk-based management and safety of railroad bridge infrastructure using wireless smart sensors (WSS).” 2015. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed April 14, 2021. http://hdl.handle.net/2142/78448.

MLA Handbook (7^th Edition):

Moreu-Alonso, Fernando. “Framework for risk-based management and safety of railroad bridge infrastructure using wireless smart sensors (WSS).” 2015. Web. 14 Apr 2021.

Vancouver:

Moreu-Alonso F. Framework for risk-based management and safety of railroad bridge infrastructure using wireless smart sensors (WSS). [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2015. [cited 2021 Apr 14]. Available from: http://hdl.handle.net/2142/78448.

Council of Science Editors:

Moreu-Alonso F. Framework for risk-based management and safety of railroad bridge infrastructure using wireless smart sensors (WSS). [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2015. Available from: http://hdl.handle.net/2142/78448

University of Illinois – Urbana-Champaign

28. Wang, Dong. Analytical solutions for temperature profile prediction in multi-layered pavement systems.

Degree: PhD, 0106, 2011, University of Illinois – Urbana-Champaign

URL: http://hdl.handle.net/2142/18241

► Accurate prediction of pavement temperature profile is essential to better characterize the mechanistic properties of paving materials and predict pavement responses under traffic and environmental… (more)

▼ Accurate prediction of pavement temperature profile is essential to better characterize the mechanistic properties of paving materials and predict pavement responses under traffic and environmental loadings. In practice, characterizing the field temperature profiles are desired in order to calculate the moduli of various pavement layers, analyze Falling Weight Deflectometer (FWD) testing data, as well as assess the load transfer efficiency across joints in concrete pavements. To facilitate estimation of pavement temperature profiles, one-dimensional (1-D) analytical solutions for temperature profiles in multi-layered pavements have been derived using the method of separation of variables and the Laplace transforms. The derived theoretical solutions consider the pavement geometries, material thermal properties, solar radiation, and air temperature. Field validation justified that these analytical solutions generate reasonable temperature profiles in the concrete slab of a four-layered continuously reinforced concrete pavement (CRCP) test section. The main advantages of these solutions are that they can rapidly predict the pavement temperature profile for short time durations, e.g., a few days, with limited input data. Under the assumption of axisymmetric thermal conditions, analytical solution for two-dimensional (2-D) temperature profiles in a multi-layered pavement system has been derived using the Hankel transform and the method of separation of variables, and validated for predicting the temperature profile in the concrete slab of a four-layered CRCP test section. Finally, rapidly varying temperature profiles in pavement systems due to transient thermal loadings generated by vertical take-off aircraft engines are systematically studied. 1-D analytical solutions for temperature fields in a two-layered pavement system using Laplace transforms are proposed for two different surface boundary conditions, i.e., specified transient surface temperature and mixed boundary condition involving heat flux emanating from the aircraft engine. Furthermore, 2-D axisymmetric temperature field in a homogeneous half-space subjected to transient thermal loading was solved using the specified surface temperature condition. Two solution methods, one based on the Hankel transforms and the method of separation of variables while another based on the Hankel and Laplace transforms, were introduced. Numerical experiments suggest that the combined results based on those two methods give reasonable approximation to the rapidly varying temperature profile. Advisors/Committee Members: Champaign%22%20%2Bcontributor%3A%28%22Roesler%2C%20Jeffery%20R.%22%29&pagesize-30">Roesler, Jeffery R. (advisor), Champaign%22%20%2Bcontributor%3A%28%22Roesler%2C%20Jeffery%20R.%22%29&pagesize-30">Roesler, Jeffery R. (Committee Chair), Champaign%22%20%2Bcontributor%3A%28%22Al-Qadi%2C%20Imad%20L.%22%29&pagesize-30">Al-Qadi, Imad L. (committee member), Champaign%22%20%2Bcontributor%3A%28%22Buttlar%2C%20William%20G.%22%29&pagesize-30">Buttlar, William G. (committee member), Champaign%22%20%2Bcontributor%3A%28%22Khazanovich%2C%20Lev%22%29&pagesize-30">Khazanovich, Lev (committee member).

Subjects/Keywords: Analytical methods; Pavement temperature profile; Integral transform techniques; Layered elastic theory; Displacement field; Stress field.

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Wang, D. (2011). Analytical solutions for temperature profile prediction in multi-layered pavement systems. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/18241

Chicago Manual of Style (16^th Edition):

Wang, Dong. “Analytical solutions for temperature profile prediction in multi-layered pavement systems.” 2011. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed April 14, 2021. http://hdl.handle.net/2142/18241.

MLA Handbook (7^th Edition):

Wang, Dong. “Analytical solutions for temperature profile prediction in multi-layered pavement systems.” 2011. Web. 14 Apr 2021.

Vancouver:

Wang D. Analytical solutions for temperature profile prediction in multi-layered pavement systems. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2011. [cited 2021 Apr 14]. Available from: http://hdl.handle.net/2142/18241.

Council of Science Editors:

Wang D. Analytical solutions for temperature profile prediction in multi-layered pavement systems. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2011. Available from: http://hdl.handle.net/2142/18241

University of Illinois – Urbana-Champaign

29. Xiao, Yuanjie. Performance-based evaluation of unbound aggregates affecting mechanistic response and performance of flexible pavements.

Degree: PhD, 0106, 2014, University of Illinois – Urbana-Champaign

URL: http://hdl.handle.net/2142/50366

► Unbound aggregates are widely used in road construction to replace unsuitable soil, prepare pavement working platform or construct pavement foundation layers. Their primary function in… (more)

▼ Unbound aggregates are widely used in road construction to replace unsuitable soil, prepare pavement working platform or construct pavement foundation layers. Their primary function in flexible pavements is to distribute wheel loads and provide adequate protection of the subgrade. However, the empirical strength based quality evaluations and current “recipe-based” specifications have little direct consideration of the actual performance of materials used in unbound aggregate layers. Based on a comprehensive set of laboratory repeated load triaxial test results archived for a variety of unbound aggregate materials, research efforts in this dissertation are aimed at linking aggregate physical and mechanical properties to pavement response and performance, identifying correlations among resilient modulus (MR), plastic deformation and shear strength behavior under repeated loading, and developing viable models to predict engineering behavior and field performance. This thesis is organized into three sections. First, statistical and generic algorithm (GA) based models are developed to estimate MR and shear strength properties for performance prediction using aggregate properties. The MR sensitivities are assessed using both Monte Carlo type simulation and First-order Reliability Method (FORM) with the interactions between aggregate properties properly taken into account. Both gradation and aggregate shape properties are identified as influential factors affecting MR. The effects of unbound aggregate quality on mechanistic response and performance (MR, shear strength and rutting) and layer characteristics on pavement life expectancies are investigated. Secondly, aggregate gradation effects on strength and modulus characteristics of unbound aggregates are analyzed from laboratory test results to develop improved material specifications. The most significant correlations are found between a gravel-to-sand ratio (proposed based on ASTM D2487-11) and aggregate shear strength properties. A certain value of gravel-to-sand ratio is proposed to optimize aggregate gradations for improved unbound layer performances primarily influenced by shear strength. To further confirm the optimal range of the gravel-to-sand ratio and verify existing packing theory based analytical gradation framework, a validated image-aided DEM approach is also employed to realistically study optimum contact and packing arrangements of the aggregate skeleton from various gradations and morphological levels for better aggregate interlock. Guidelines are recommended for engineering the aggregate shape and gradation properties to achieve such desired improved engineering performances of unbound aggregate layers. Finally, this research described employs the shakedown concept to interpret laboratory single-stage repeated load triaxial permanent deformation test results performed at varying dynamic stress states and aggregate physical conditions. A stable permanent strain rate is highlighted to give a viable criterion for ranking the rutting potential of unbound… Advisors/Committee Members: Champaign%22%20%2Bcontributor%3A%28%22Tutumluer%2C%20Erol%22%29&pagesize-30">Tutumluer, Erol (advisor), Champaign%22%20%2Bcontributor%3A%28%22Tutumluer%2C%20Erol%22%29&pagesize-30">Tutumluer, Erol (Committee Chair), Champaign%22%20%2Bcontributor%3A%28%22Wilde%2C%20W.%20James%22%29&pagesize-30">Wilde, W. James (committee member), Champaign%22%20%2Bcontributor%3A%28%22Al-Qadi%2C%20Imad%20L.%22%29&pagesize-30">Al-Qadi, Imad L. (committee member), Champaign%22%20%2Bcontributor%3A%28%22Thompson%2C%20Marshall%20R.%22%29&pagesize-30">Thompson, Marshall R. (committee member), Champaign%22%20%2Bcontributor%3A%28%22Roesler%2C%20Jeffery%20R.%22%29&pagesize-30">Roesler, Jeffery R. (committee member).

Subjects/Keywords: Unbound Aggregates; Flexible Pavements; Performance-based Evaluation; Resilient Modulus; Shear Strength; Permanent Deformation; Rutting; Mechanistic-Empirical Pavement Design Guide (MEPDG)

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Xiao, Y. (2014). Performance-based evaluation of unbound aggregates affecting mechanistic response and performance of flexible pavements. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/50366

Chicago Manual of Style (16^th Edition):

Xiao, Yuanjie. “Performance-based evaluation of unbound aggregates affecting mechanistic response and performance of flexible pavements.” 2014. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed April 14, 2021. http://hdl.handle.net/2142/50366.

MLA Handbook (7^th Edition):

Xiao, Yuanjie. “Performance-based evaluation of unbound aggregates affecting mechanistic response and performance of flexible pavements.” 2014. Web. 14 Apr 2021.

Vancouver:

Xiao Y. Performance-based evaluation of unbound aggregates affecting mechanistic response and performance of flexible pavements. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2014. [cited 2021 Apr 14]. Available from: http://hdl.handle.net/2142/50366.

Council of Science Editors:

Xiao Y. Performance-based evaluation of unbound aggregates affecting mechanistic response and performance of flexible pavements. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2014. Available from: http://hdl.handle.net/2142/50366

University of Illinois – Urbana-Champaign

30. Pekcan, Onur. Soft computing based parameter identification in pavements and geomechanical systems.

Degree: PhD, 0106, 2012, University of Illinois – Urbana-Champaign

URL: http://hdl.handle.net/2142/29519

► Accurate estimation of road pavement geometry and layer material properties through the use of proper nondestructive testing and sensor technologies is essential for evaluating pavement’s… (more)

▼ Accurate estimation of road pavement geometry and layer material properties through the use of proper nondestructive testing and sensor technologies is essential for evaluating pavement’s structural condition and determining options for maintenance and rehabilitation. For these purposes, pavement deflection basins produced by the nondestructive Falling Weight Deflectometer (FWD) test data are commonly used. The nondestructive FWD test drops weights on the pavement to simulate traffic loads and measures the created pavement deflection basins. Backcalculation of pavement geometry and layer properties using FWD deflections is a difficult inverse problem, and the solution with conventional mathematical methods is often challenging due to the ill-posed nature of the problem. In this dissertation, a hybrid algorithm was developed to seek robust and fast solutions to this inverse problem. The algorithm is based on soft computing techniques, mainly Artificial Neural Networks (ANNs) and Genetic Algorithms (GAs) as well as the use of numerical analysis techniques to properly simulate the geomechanical system. A widely used pavement layered analysis program ILLI-PAVE was employed in the analyses of flexible pavements of various pavement types; including full-depth asphalt and conventional flexible pavements, were built on either lime stabilized soils or untreated subgrade. Nonlinear properties of the subgrade soil and the base course aggregate as transportation geomaterials were also considered. A computer program, Soft Computing Based System Identifier or SOFTSYS, was developed. In SOFTSYS, ANNs were used as surrogate models to provide faster solutions of the nonlinear finite element program ILLI-PAVE. The deflections obtained from FWD tests in the field were matched with the predictions obtained from the numerical simulations to develop SOFTSYS models. The solution to the inverse problem for multi-layered pavements is computationally hard to achieve and is often not feasible due to field variability and quality of the collected data. The primary difficulty in the analysis arises from the substantial increase in the degree of non-uniqueness of the mapping from the pavement layer parameters to the FWD deflections. The insensitivity of some layer properties lowered SOFTSYS model performances. Still, SOFTSYS models were shown to work effectively with the synthetic data obtained from ILLI-PAVE finite element solutions. In general, SOFTSYS solutions very closely matched the ILLI-PAVE mechanistic pavement analysis results. For SOFTSYS validation, field collected FWD data were successfully used to predict pavement layer thicknesses and layer moduli of in-service flexible pavements. Some of the very promising SOFTSYS results indicated average absolute errors on the order of 2%, 7%, and 4% for the Hot Mix Asphalt (HMA) thickness estimation of full-depth asphalt pavements, full-depth pavements on lime stabilized soils and conventional flexible pavements, respectively. The field validations of SOFTSYS… Advisors/Committee Members: Champaign%22%20%2Bcontributor%3A%28%22Tutumluer%2C%20Erol%22%29&pagesize-30">Tutumluer, Erol (advisor), Champaign%22%20%2Bcontributor%3A%28%22Ghaboussi%2C%20Jamshid%22%29&pagesize-30">Ghaboussi, Jamshid (advisor), Champaign%22%20%2Bcontributor%3A%28%22Tutumluer%2C%20Erol%22%29&pagesize-30">Tutumluer, Erol (Committee Chair), Champaign%22%20%2Bcontributor%3A%28%22Ghaboussi%2C%20Jamshid%22%29&pagesize-30">Ghaboussi, Jamshid (committee member), Champaign%22%20%2Bcontributor%3A%28%22Thompson%2C%20Marshall%20R.%22%29&pagesize-30">Thompson, Marshall R. (committee member), Champaign%22%20%2Bcontributor%3A%28%22Al-Qadi%2C%20Imad%20L.%22%29&pagesize-30">Al-Qadi, Imad L. (committee member).

Subjects/Keywords: transportation geotechnics; pavements; geomechanical systems; inverse problems; Parameter identification; backcalculation; falling weight deflectometer; artificial neural networks; genetic algorithms; soft computing; nondestructive testing; asphalt concrete; lime stabilization; subgrade; SOFTSYS; finite element method; nonlinear finite element method; ILLI-PAVE

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Pekcan, O. (2012). Soft computing based parameter identification in pavements and geomechanical systems. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/29519

Chicago Manual of Style (16^th Edition):

Pekcan, Onur. “Soft computing based parameter identification in pavements and geomechanical systems.” 2012. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed April 14, 2021. http://hdl.handle.net/2142/29519.

MLA Handbook (7^th Edition):

Pekcan, Onur. “Soft computing based parameter identification in pavements and geomechanical systems.” 2012. Web. 14 Apr 2021.

Vancouver:

Pekcan O. Soft computing based parameter identification in pavements and geomechanical systems. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2012. [cited 2021 Apr 14]. Available from: http://hdl.handle.net/2142/29519.

Council of Science Editors:

Pekcan O. Soft computing based parameter identification in pavements and geomechanical systems. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2012. Available from: http://hdl.handle.net/2142/29519

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