+publisher:"University of Illinois – Urbana-Champaign" +contributor:("Thompson, Marshall")

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University of Illinois – Urbana-Champaign

1. 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 (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 January 16, 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. 16 Jan 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 Jan 16]. 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

2. 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 January 16, 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. 16 Jan 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 Jan 16]. 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

3. 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 January 16, 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. 16 Jan 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 Jan 16]. 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

4. 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 January 16, 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. 16 Jan 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 Jan 16]. 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

5. Moaveni, Maziar. Advanced image analysis and techniques for degradation characterization of aggregates.

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

URL: http://hdl.handle.net/2142/78734

► Morphological or shape properties of virgin and recycled aggregate sources are known to affect pavement and railroad track mechanistic behavior and performance significantly in terms… (more)

▼ Morphological or shape properties of virgin and recycled aggregate sources are known to affect pavement and railroad track mechanistic behavior and performance significantly in terms of strength, modulus and permanent deformation. Under repeated traffic loading aggregate particles used in construction of pavement and railroad track are routinely subjected to degradation through attrition, impact, grinding and polishing type mechanisms, which result in altering their shape and size properties. The recent advances in digital image acquisition and processing techniques have the potential to be used for objective and accurate measurement of aggregate particle size and shape properties in a rapid, reliable and automated fashion both in the laboratory and in the field. The primary focus of this dissertation includes the design, manufacturing, calibration and validation of different hardware and software components of an Enhanced-University of Illinois Aggregate Image Analyzer (E-UIAIA) with many improvements over the first generation device. A new fully automated color image segmentation algorithm was developed as part of this research which showed excellent performance in detecting aggregate particles with different sizes and natural colors. Customized Look Up Tables (LUTs) were developed to enhance the Hue (H) and Saturation (S) representations of dark and bright aggregate images which improved the thresholding results. The different binary image processing modules available in the original UIAIA device for computing size and shape properties of aggregate particles were updated and merged into a single user friendly interface. Moreover, a new processing algorithm for image arithmetic operations and thresholding was developed and validated for computing the percentages of asphalt coating on Reclaimed Asphalt Pavement (RAP) aggregates. The research findings presented in this dissertation include the implementation of newly developed E-UIAIA in capturing the rate and magnitude of changes in shape and size properties of aggregate particles caused by abrasion, polishing and breakage actions at different degradation levels. The standard laboratory degradation test results including Los Angeles Abrasion (LAA) and Micro-Deval (MD) were combined with imaging based particle shape indices to successfully classify different aggregate sources according to their resistance to degradation. As a step forward for bringing the advances in aggregate imaging methods to project sites and quarries, this dissertation introduces a field aggregate image acquisition and processing procedure. Advanced image analysis and segmentation techniques that combine a Markov Random Field (MRF) approach for image modeling, graph cut for optimization and user interaction for enforcing hard constraints were used. The developed algorithm was utilized for extraction and analyses of individual aggregate particle size and shape properties from 2D field images of multi-aggregate particles captured in a single frame using a Digital Single Lens Reflex (DSLR)… 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%22Thompson%2C%20Marshall%20R.%22%29&pagesize-30">Thompson, Marshall R. (committee member), Champaign%22%20%2Bcontributor%3A%28%22Barkan%2C%20Christopher%20P.L.%22%29&pagesize-30">Barkan, Christopher P.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%22Mahmoud%2C%20Enad%22%29&pagesize-30">Mahmoud, Enad (committee member).

Subjects/Keywords: Aggregate shape properties; Image processing; Aggregate degradation; Machine vision; Image segmentation; Reclaimed Asphalt Pavement (RAP)

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

APA (6^th Edition):

Moaveni, M. (2015). Advanced image analysis and techniques for degradation characterization of aggregates. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/78734

Chicago Manual of Style (16^th Edition):

Moaveni, Maziar. “Advanced image analysis and techniques for degradation characterization of aggregates.” 2015. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed January 16, 2021. http://hdl.handle.net/2142/78734.

MLA Handbook (7^th Edition):

Moaveni, Maziar. “Advanced image analysis and techniques for degradation characterization of aggregates.” 2015. Web. 16 Jan 2021.

Vancouver:

Moaveni M. Advanced image analysis and techniques for degradation characterization of aggregates. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2015. [cited 2021 Jan 16]. Available from: http://hdl.handle.net/2142/78734.

Council of Science Editors:

Moaveni M. Advanced image analysis and techniques for degradation characterization of aggregates. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2015. Available from: http://hdl.handle.net/2142/78734

University of Illinois – Urbana-Champaign

6. 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 January 16, 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. 16 Jan 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 Jan 16]. 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

7. 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 January 16, 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. 16 Jan 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 Jan 16]. 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

University of Illinois – Urbana-Champaign

8. 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 January 16, 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. 16 Jan 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 Jan 16]. 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

9. 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 January 16, 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. 16 Jan 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 Jan 16]. 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

10. McGovern, Megan E. Non-destructive quantitative assessment of oxidation in aged and rejuvenated asphalt concrete pavements using a non-collinear wave mixing approach.

Degree: PhD, Systems & Entrepreneurial Engr, 2016, University of Illinois – Urbana-Champaign

URL: http://hdl.handle.net/2142/92755

► Oxidative aging in asphalt concrete pavements is one of the chief contributors to pavement degradation. Oxidation contributes to the formation of a diffuse micro-flaw population… (more)

▼ Oxidative aging in asphalt concrete pavements is one of the chief contributors to pavement degradation. Oxidation contributes to the formation of a diffuse micro-flaw population in the mastic. This damage is primarily concentrated at the top (surface) of the pavement, where exposure to oxygen is the greatest. These flaws serve as the nuclei to crack formation and propagation, and adversely affect the pavement's structural integrity. It is more cost effective to perform maintenance when the pavement contains relatively little damage, than it is to defer maintenance until more drastic measures must be taken. Currently, engineers lack the proper tools for non-destructive, quick, and reliable inspection. The work in this report addresses this need by employing non-collinear wave mixing, a nonlinear acoustic technique, to evaluate the level of oxidation of the pavement. To implement the nonlinear technique, the linear acoustic parameters, i.e., dilatational and shear velocities and attenuations, of asphalt concrete specimens with various levels of oxidative aging were characterized. In non-collinear wave mixing, two waves are propagated so that they cross paths. Under the right conditions, these two waves will interact to produce a third wave. Taking advantage of critically refracted longitudinal waves enabled the non-collinear wave mixing measurements to be taken from the pavement surface. Two nonlinear parameters were measured as a function of oxidative aging: the efficiency of interaction, β/β0 , and the frequency at which the interaction takes place, ƒ2/ƒ1. A nonlinear damage characterization curve was introduced, which is generated for a particular mixture under laboratory conditions, by plotting β/β0 versus ƒ2/ƒ1 for various levels of oxidative aging. Field pavement measurements of (β/β0, ƒ2/ƒ1) can then be referenced against the nonlinear damage characterization curve to evaluate the state of the pavement. The testing set-up was configured to be one-sided, hence truly non-destructive, via the use of these subsurface waves. Two data-collection approaches are presented, which can be used even if the linear acoustic properties are unknown a priori, for practical field implementation. The efficacy of an asphalt rejuvenation product was also studied using this technique. Pavement engineers can thus continuously monitor the pavement and make decisions (such as the application of rejuvenators) to prolong its service life. Advisors/Committee Members: Champaign%22%20%2Bcontributor%3A%28%22Reis%2C%20Henrique%22%29&pagesize-30">Reis, Henrique (advisor), Champaign%22%20%2Bcontributor%3A%28%22Reis%2C%20Henrique%22%29&pagesize-30">Reis, Henrique (Committee Chair), 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%22O%27Brien%2C%20William%20%20D.%22%29&pagesize-30">O'Brien, William D. (committee member), Champaign%22%20%2Bcontributor%3A%28%22Sreenivas%2C%20Ramavarapu%20S.%22%29&pagesize-30">Sreenivas, Ramavarapu S. (committee member), Champaign%22%20%2Bcontributor%3A%28%22Thompson%2C%20Marshall%20R.%22%29&pagesize-30">Thompson, Marshall R. (committee member).

Subjects/Keywords: Non-collinear wave mixing; Nonlinear acoustics; Asphalt pavements; Rejuvenators; Oxidation; Oxidative aging; Non-destructive testing; Damage characterization; Quantitative assessment; One-sided

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

APA (6^th Edition):

McGovern, M. E. (2016). Non-destructive quantitative assessment of oxidation in aged and rejuvenated asphalt concrete pavements using a non-collinear wave mixing approach. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/92755

Chicago Manual of Style (16^th Edition):

McGovern, Megan E. “Non-destructive quantitative assessment of oxidation in aged and rejuvenated asphalt concrete pavements using a non-collinear wave mixing approach.” 2016. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed January 16, 2021. http://hdl.handle.net/2142/92755.

MLA Handbook (7^th Edition):

McGovern, Megan E. “Non-destructive quantitative assessment of oxidation in aged and rejuvenated asphalt concrete pavements using a non-collinear wave mixing approach.” 2016. Web. 16 Jan 2021.

Vancouver:

McGovern ME. Non-destructive quantitative assessment of oxidation in aged and rejuvenated asphalt concrete pavements using a non-collinear wave mixing approach. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2016. [cited 2021 Jan 16]. Available from: http://hdl.handle.net/2142/92755.

Council of Science Editors:

McGovern ME. Non-destructive quantitative assessment of oxidation in aged and rejuvenated asphalt concrete pavements using a non-collinear wave mixing approach. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2016. Available from: http://hdl.handle.net/2142/92755

University of Illinois – Urbana-Champaign

11. 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 January 16, 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. 16 Jan 2021.

Vancouver:

Yousefi SS. Model development and validation of bituminous-based crack sealants. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2019. [cited 2021 Jan 16]. 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

12. Qamhia, Issam I.A. Sustainable pavement applications utilizing quarry by-products and recycled/nontraditional aggregate materials.

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

URL: http://hdl.handle.net/2142/104851

► Quarry By-products (QB), usually less than 0.25 in. (6 mm) in size, are the residual deposits from the production of required grades of aggregates and… (more)

▼ Quarry By-products (QB), usually less than 0.25 in. (6 mm) in size, are the residual deposits from the production of required grades of aggregates and are often stockpiled in excess quantities at the quarries. More than 175 million US tons of QB are produced every year from the 3,000 operating quarries around the US. QB pose environmental and economic challenges as they accumulate in large quantities in landfills or interfere with quarry operations. With recent focus on sustainable construction practices and the scarcity of natural resources, more common and sustainable uses of by-product materials such as QB are becoming imperative. This dissertation focuses on the introduction and evaluation of new sustainable applications of QB and/or QB mixed with other marginal, virgin or recycled aggregate materials in pavements. The selected QB applications were evaluated through the construction of full-scale pavement test sections utilizing QB in targeted sustainable applications, and testing them with heavy wheel loads through Accelerated Pavement Testing (APT). The QB applications studied included both unbound and bound (chemically stabilized) pavement subsurface/foundation layers. The studied QB pavement applications were in five categories: (1) Using QB for filling voids between large stones as aggregate subgrade on soft subgrades; (2) increased fines content (e.g. 15% QB fines passing No. 200 sieve) in dense-graded aggregate subbase over soft subgrade soils; (3) using QB as a cement or fly ash-treated subbase (e.g., in inverted pavements); (4) using QB as a cement-treated base material; and (5) for base course applications, blending QB with coarse aggregate fractions of recycled materials and stabilizing the blends with 3% cement or 10% class C fly ash. In preparation for the field evaluations, several laboratory studies were conducted to finalize the designs of intended QB applications. The main laboratory studies were: (1) A packing study of QB with recycled coarse aggregates to determine the optimum blending ratio; (2) a packing study to aid the construction of large aggregate subgrade with QB materials filling the inherent voids; and, (3) Unconfined Compressive Strength (UCS) tests for chemically stabilized QB samples. Fifteen full-scale pavement test sections utilizing QB applications and one conventional flexible section were constructed in three ‘Test Cells.’ Cell 1 had four paved and four unpaved test sections to study construction platforms and low volume road applications of QB. Cells 2 and 3 studied chemically stabilized QB applications for base and subbase layers. Construction activities included engineering the top 305 mm (12 in.) of existing subgrade to a California Bearing Ratio (CBR) = 1% for Cell 1 test sections and to a CBR = 6% for all the pavement test sections in Cells 2 and 3. Subgrade modification was achieved through moisture adjustment and compaction. The construction of the QB layers were successfully achieved and extensively monitored. The data for nuclear density measurements and moisture… 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%22Ozer%2C%20Hasan%22%29&pagesize-30">Ozer, Hasan (committee member), Champaign%22%20%2Bcontributor%3A%28%22Puppala%2C%20Anand%22%29&pagesize-30">Puppala, Anand (committee member).

Subjects/Keywords: Quarry By-Products; Accelerated Pavement Testing; Life Cycle Assessment; Life Cycle Cost Analysis; Sustainability; Mechanistic Modelling; Pavement; Stabilized; Aggregates; Transportation Geotechnics; Nontraditional Aggregates; FRAP; FRCA

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APA (6^th Edition):

Qamhia, I. I. A. (2019). Sustainable pavement applications utilizing quarry by-products and recycled/nontraditional aggregate materials. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/104851

Chicago Manual of Style (16^th Edition):

Qamhia, Issam I A. “Sustainable pavement applications utilizing quarry by-products and recycled/nontraditional aggregate materials.” 2019. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed January 16, 2021. http://hdl.handle.net/2142/104851.

MLA Handbook (7^th Edition):

Qamhia, Issam I A. “Sustainable pavement applications utilizing quarry by-products and recycled/nontraditional aggregate materials.” 2019. Web. 16 Jan 2021.

Vancouver:

Qamhia IIA. Sustainable pavement applications utilizing quarry by-products and recycled/nontraditional aggregate materials. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2019. [cited 2021 Jan 16]. Available from: http://hdl.handle.net/2142/104851.

Council of Science Editors:

Qamhia IIA. Sustainable pavement applications utilizing quarry by-products and recycled/nontraditional aggregate materials. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2019. Available from: http://hdl.handle.net/2142/104851

13. Mallela, Jagannath. Development of the Duomorph Asphalt Rheology Tester (DART): a self-contained, portable device for quality assurance testing of asphalt binders.

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

URL: http://hdl.handle.net/2142/55155

► This dissertation developed a bench prototype device, named as the Duomorph Asphalt Rheology Tester or DART, for use in quality assurance (QA) testing of asphalt… (more)

▼ This dissertation developed a bench prototype device, named as the Duomorph Asphalt Rheology Tester or DART, for use in quality assurance (QA) testing of asphalt binders. This self-contained, portable device was re-engineered from its original version developed in the 1970s to test the structural integrity of solid rocket propellant fuels. Central to the DART system is a circular piezoelectric duomorph or bimorph with strain sensors that record its response to an applied alternating current (AC) electrical voltage signal. The strain signal’s amplitude and lag relative to the drive signal vary as a function of the properties of the medium it is operating in. The goal of this research was to provide a methodology, using the outputs from the duomorph as a basis, to rapidly and cost-effectively test virgin and modified asphalt binders for specification compliance either at the refinery, the blending terminal, the asphalt plant, or at the job site. The DART was evaluated both as a surrogate test device to the Dynamic Shear Rheometer (DSR) and also as a device capable of directly estimating the AASHTO M320 Table 1 specification parameters—the complex shear modulus (G*) and phase angle (d). The first phase of the research evaluated the physical and operational characteristics of a prototype DART system and its feasibility to test asphalt binders. Various DART gage instrumentation techniques and piezo driving and grounding methods were also examined. It was determined that the DART gage and the associated electronics can withstand normal laboratory use for extended periods of time. Further the DART gage’s primary outputs— bending strains and phase shifts—were repeatable and correlated well with G* and . The gage responses were found to be unique to each asphalt binder grade tested thereby establishing the ability of the system to “fingerprint” asphalt binders and function as an effective QA tool. Finally, the range of asphalt binder storage moduli and phase angles over which the DART was system was effective was established. The next phase involved making direct comparisons of the DART estimated G* and d using an existing data reduction technique developed in the 1970s with those determined from the DSR. These comparisons indicated the need to develop a theoretical framework to more accurately predict asphalt binder G* and d from the DART gage responses. A finite element (FE) model was subsequently configured to simulate the gage behavior in air and when embedded in an asphalt medium. After establishing suitable load equivalencies, the finite element analysis was performed entirely in the mechanical domain. This was done primarily to reduce input complexity associated with performing a coupled piezoelectric-steady state analysis. The FE model’s results compared well with laboratory measured DART responses across a range of binders tested, thereby validating the model. A parametric study was then conducted using the FE model over a range of assumed asphalt binder viscoelastic properties to develop… Advisors/Committee Members: Champaign%22%20%2Bcontributor%3A%28%22Carpenter%2C%20Samuel%20H.%22%29&pagesize-30">Carpenter, Samuel H. (advisor), Champaign%22%20%2Bcontributor%3A%28%22Carpenter%2C%20Samuel%20H.%22%29&pagesize-30">Carpenter, Samuel H. (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%22Dempsey%2C%20Barry%20J.%22%29&pagesize-30">Dempsey, Barry J. (committee member), Champaign%22%20%2Bcontributor%3A%28%22L.M.%20dos%20Reis%2C%20Henrique%22%29&pagesize-30">L.M. dos Reis, Henrique (committee member).

Subjects/Keywords: asphalt rheology; asphalt binder testing; binder rheology; Superpave binder grading; performance grade; quality control; acceptance; duomorph; bimorph; binder testing

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APA (6^th Edition):

Mallela, J. (2014). Development of the Duomorph Asphalt Rheology Tester (DART): a self-contained, portable device for quality assurance testing of asphalt binders. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/55155

Chicago Manual of Style (16^th Edition):

Mallela, Jagannath. “Development of the Duomorph Asphalt Rheology Tester (DART): a self-contained, portable device for quality assurance testing of asphalt binders.” 2014. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed January 16, 2021. http://hdl.handle.net/2142/55155.

MLA Handbook (7^th Edition):

Mallela, Jagannath. “Development of the Duomorph Asphalt Rheology Tester (DART): a self-contained, portable device for quality assurance testing of asphalt binders.” 2014. Web. 16 Jan 2021.

Vancouver:

Mallela J. Development of the Duomorph Asphalt Rheology Tester (DART): a self-contained, portable device for quality assurance testing of asphalt binders. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2014. [cited 2021 Jan 16]. Available from: http://hdl.handle.net/2142/55155.

Council of Science Editors:

Mallela J. Development of the Duomorph Asphalt Rheology Tester (DART): a self-contained, portable device for quality assurance testing of asphalt binders. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2014. Available from: http://hdl.handle.net/2142/55155

14. Gonzalez, Carlos R. Development and validation of a stress-based procedure for the design of military flexible pavements.

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

URL: http://hdl.handle.net/2142/78316

► This research study focuses on the development, validation and implementation of a new stress-based design procedure for military flexible airfield pavements. This proposed new procedure… (more)

▼ This research study focuses on the development, validation and implementation of a new stress-based design procedure for military flexible airfield pavements. This proposed new procedure is based on the U.S. Army Corps of Engineers California Bearing Ratio (CBR) design methodology. The CBR design methodology has its roots on a very simple, but still reasonable theoretical approach, where the pavement is modeled by a single layer system described by the Boussinesq half-space stress model. The objective to develop a new stress-based design procedure was fostered by the results of an extensive literature review on the early work done during the development of the original CBR procedure. This literature review revealed that the CBR procedure was fundamentally derived from sound theoretical basis and was actually developed as a stress-based methodology that followed a soil stress model proposed by O. K. Fröhlich in 1934. It was found that Fröhlich’s stress equations for vertical stress, which make use of a stress concentration factor to improve predictions of stresses within a soil mass, can be used to derive the current form of the fundamental equation in which the CBR procedure is based on. The discovery that the original CBR procedure pointed to a stress-based design approach led to the further investigation of the mathematical basis of the original CBR equation. This research focused its effort in the re-formulation of the basic CBR equation, corroborating its validity and developing a complete system for the design of flexible pavements using a stress-based approach. To develop, validate and implement the proposed stress-based design procedure, this research study was undertaken to fulfill the following objectives. The first objective was to review and consolidate all historical information on the origins of the classical CBR equation and to reformulate its mathematical derivation into a stress-based approach. The second objective was to introduce a new stress-based criterion, called the CBR-Beta procedure, for design of flexible pavements. The third objective consisted of performing experiments to help validate the stress distribution within pavement structures subjected to various aircraft loadings. A full-scale experiment was developed to construct twelve flexible pavement test sections so that the proposed CBR-Beta procedure could be implemented and studied in the field. The fourth objective was to further validate the proposed stress-based CBR design procedure utilizing the results of field traffic experiments, laboratory testing and modeling. Finally, the fifth objective was to consolidate all the results from full-scale traffic testing, validation of stress distribution within a pavement structure and modeling into a cohesive and complete stress-based design procedure. The results of this PhD study have demonstrated that the new re-formulation of the CBR procedure can be applied to the structural thickness designs of flexible pavements. The new form of the CBR-Beta criterion was found to be of… 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%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), 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%22Anderton%2C%20Gary%20L.%22%29&pagesize-30">Anderton, Gary L. (committee member).

Subjects/Keywords: airfields; CBR-Beta Criteria; military; concentration factor; Frohlich; Stress-based Design of flexible pavements; Pavement Design; California Bearing Ratio (CBR) Method

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APA (6^th Edition):

Gonzalez, C. R. (2015). Development and validation of a stress-based procedure for the design of military flexible pavements. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/78316

Chicago Manual of Style (16^th Edition):

Gonzalez, Carlos R. “Development and validation of a stress-based procedure for the design of military flexible pavements.” 2015. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed January 16, 2021. http://hdl.handle.net/2142/78316.

MLA Handbook (7^th Edition):

Gonzalez, Carlos R. “Development and validation of a stress-based procedure for the design of military flexible pavements.” 2015. Web. 16 Jan 2021.

Vancouver:

Gonzalez CR. Development and validation of a stress-based procedure for the design of military flexible pavements. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2015. [cited 2021 Jan 16]. Available from: http://hdl.handle.net/2142/78316.

Council of Science Editors:

Gonzalez CR. Development and validation of a stress-based procedure for the design of military flexible pavements. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2015. Available from: http://hdl.handle.net/2142/78316

15. Hakimzadeh Khoee, Salman. Evaluation of bond between pavement layers: fracture mechanics approach.

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

URL: http://hdl.handle.net/2142/78656

► Bonding between adjacent pavement layers is one of the most important factors affecting pavement service life. Poor bonding between adjacent layers of hot mix asphalt… (more)

▼ Bonding between adjacent pavement layers is one of the most important factors affecting pavement service life. Poor bonding between adjacent layers of hot mix asphalt can lead to different types of distresses in pavement system such as slippage cracking, top-down cracking, premature fatigue cracking, and in some cases complete delamination. A considerable number of research projects have been conducted to examine interface bonding and many test methods have been proposed to evaluate the bonding between pavement layers. However, a review of the literature has shown that research on interface bonding using fundamental fracture mechanics has been very limited and is still in its early stage. Furthermore, laboratory tests and analyses that capture a broad range of fracture behavior, such as opening and shearing, have yet to be developed. The main objectives of this study were to investigate the capability of fracture mechanics approach for assessment of bonding between pavement layers and to identify performance-related tests that can be used to generate fundamental fracture data that can be readily utilized in computational models in order to facilitate system optimization and linkage between material properties and field performance. This dissertation describes the development, application, and validation of three new fracture energy based interface bond tests including the Interface Bond Test (IBT), Three-Point Bending Notched Beam Test, and Four-Point Shear Notched Beam Test that can be used for the characterization of interface behavior between adjacent pavement layers (HMA-HMA or HMA-PCC) under different modes of failure including Mode I (tensile Mode), Mode II (shear Mode), and Mixed-Mode (combination of Mode I and Mode II). The tests were evaluated in the context of laboratory and field samples produced with different interface treatments along with finite element simulations. The obtained results clearly demonstrate the ability of the newly developed tests to evaluate the quality of the bonding between pavement layers and to generate fundamental fracture data that can be used in computational models. 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%22%29&pagesize-30">Dave, Eshan (committee member), Champaign%22%20%2Bcontributor%3A%28%22Exline%2C%20Marvin%22%29&pagesize-30">Exline, Marvin (committee member).

Subjects/Keywords: Interface bonding; Fracture energy

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APA (6^th Edition):

Hakimzadeh Khoee, S. (2015). Evaluation of bond between pavement layers: fracture mechanics approach. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/78656

Chicago Manual of Style (16^th Edition):

Hakimzadeh Khoee, Salman. “Evaluation of bond between pavement layers: fracture mechanics approach.” 2015. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed January 16, 2021. http://hdl.handle.net/2142/78656.

MLA Handbook (7^th Edition):

Hakimzadeh Khoee, Salman. “Evaluation of bond between pavement layers: fracture mechanics approach.” 2015. Web. 16 Jan 2021.

Vancouver:

Hakimzadeh Khoee S. Evaluation of bond between pavement layers: fracture mechanics approach. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2015. [cited 2021 Jan 16]. Available from: http://hdl.handle.net/2142/78656.

Council of Science Editors:

Hakimzadeh Khoee S. Evaluation of bond between pavement layers: fracture mechanics approach. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2015. Available from: http://hdl.handle.net/2142/78656

16. Mishra, Debakanta. Aggregate characteristics affecting response and performance of unsurfaced pavements on weak subgrades.

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

URL: http://hdl.handle.net/2142/31136

► Design of low volume roads and unsurfaced pavements traditionally involves covering the prepared subgrade with an unbound aggregate layer of sufficient thickness such that traffic-induced… (more)

▼ Design of low volume roads and unsurfaced pavements traditionally involves covering the prepared subgrade with an unbound aggregate layer of sufficient thickness such that traffic-induced wheel loads are adequately distributed and stresses on the subgrade can be tolerated. Aggregate gradation and field-density requirements are commonly the only considerations for constructing "acceptable" aggregate cover layers. Aggregate quality aspects and properties are not considered in detail while selecting aggregate sources often with the lowest material hauling and transportation costs. This approach based solely on economic considerations may result in the selection of locally available poor quality material for routine use as the primary pavement load bearing layer. The primary objective of this PhD research was to evaluate individual effects of selected aggregate physical properties (test factors), such as particle shape, texture and angularity, type and amount of fines, and compaction (moisture-density) conditions on the response and performance of unsurfaced pavements. Three different aggregate types, namely crushed limestone, crushed dolomite and uncrushed gravel were selected to first quantify the effects of individual test factors on aggregate shear strength, permanent deformation and directional modulus characteristics through a controlled laboratory test matrix. Laboratory test results showed that the effects of individual test factors on aggregate behavior changed significantly depending on the levels assigned to other test factors. Crushed aggregates showed consistently higher shear strength and modulus, and lower permanent deformations due to improved particle interlock when compared to the uncrushed gravel. The effect of type of fines on aggregate behavior was erratic at low fines contents, and was more pronounced when the fines fraction occupied a significant proportion of the voids in the aggregate matrix. Plastic fines when combined with excessive moisture, were found to destroy the inter-particle load transfer in the aggregate matrix, thus inducing excessive deformations under loading leading to specimen failure. The concept of anisotropic modulus ratio, an indicator of compaction induced anisotropy in aggregates, was successfully applied as a material quality indicator for predicting unbound aggregate behavior. Important findings from laboratory testing of aggregates served as the basis for material selection and thickness design of full-scale unsurfaced pavement sections for accelerated testing. Five different test "cells" were constructed at different combinations of aggregate material quality and engineered subgrade strength, and were tested to failure using an Accelerated Transportation Loading Assembly (ATLAS) under near-optimum and flooded aggregate moisture conditions. Test section performances under simulated traffic loading were monitored through surface profile measurements and transverse scanning with Ground Penetrating Radar (GPR) for assessment of subsurface deformations. Transverse… 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%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%22Butt%2C%20Abbas%20A.%22%29&pagesize-30">Butt, Abbas A. (committee member).

Subjects/Keywords: Unsurfaced Pavements; Unbound Aggregates; Pavement Working Platforms; Gravel Roads; Uncrushed Aggregates; Accelerated Pavement Testing; Rutting; Shear Failure; Aggregate Shape; Type of Fines; Fines Content

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APA (6^th Edition):

Mishra, D. (2012). Aggregate characteristics affecting response and performance of unsurfaced pavements on weak subgrades. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/31136

Chicago Manual of Style (16^th Edition):

Mishra, Debakanta. “Aggregate characteristics affecting response and performance of unsurfaced pavements on weak subgrades.” 2012. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed January 16, 2021. http://hdl.handle.net/2142/31136.

MLA Handbook (7^th Edition):

Mishra, Debakanta. “Aggregate characteristics affecting response and performance of unsurfaced pavements on weak subgrades.” 2012. Web. 16 Jan 2021.

Vancouver:

Mishra D. Aggregate characteristics affecting response and performance of unsurfaced pavements on weak subgrades. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2012. [cited 2021 Jan 16]. Available from: http://hdl.handle.net/2142/31136.

Council of Science Editors:

Mishra D. Aggregate characteristics affecting response and performance of unsurfaced pavements on weak subgrades. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2012. Available from: http://hdl.handle.net/2142/31136

University of Illinois – Urbana-Champaign

17. Kim, Minkyum. Development of differential scheme micromechanics modeling framework for predictions of hot-mix asphalt (HMA) complex modulus and experimental validations.

Degree: PhD, 0106, 2010, University of Illinois – Urbana-Champaign

URL: http://hdl.handle.net/2142/14609

► The viscoelastic modulus of hot-mix asphalt (HMA) such as the complex modulus, E*, is an essential material parameter for better paving mixture design and asphalt… (more)

▼ The viscoelastic modulus of hot-mix asphalt (HMA) such as the complex modulus, E*, is an essential material parameter for better paving mixture design and asphalt pavement design. Under certain circumstances, it is desirable that a reasonable modulus value of certain HMA mixtures be estimated for this purpose. Empirical and semi empirical models have been proposed and used. However, these non-fundamental approaches have significant drawbacks, particularly with application of the model for materials that vary from those used in the calibration of the model, and their reliance on large calibration data sets, which led to introducing some fuzzy factors in their predictions. In order to overcome the limitations of an empirical approach, a fundamental micromechanics modeling framework based on the differential scheme effective medium theory has been developed and introduced herein. To verify and validate the prediction accuracy and applicability, a series of various asphalt-aggregate mixtures starting from the homogeneous asphalt binder phase up to a very highly packed composite of dense HMA mixtures were produced in the lab by progressively increasing the aggregate volume concentration in the composite from 0 to nearly 0.9. These various mixtures were tested in the Hollow Cylinder Tensile Tester (HCT) to obtain the extensional complex modulus (E*) at three low temperatures within -25 to 5 °C range and at various loading frequencies from 10 Hz to 0.01 Hz. Comparisons between the model predicted E* and the experimental E* showed good agreement with reasonable accuracies. Remaining challenges for the practical implementation of the proposed model such as the applicability at intermediate to high temperature materials property prediction and particle orientation effects were discussed based on the analysis and additional model predictions for an independent experimental data set. 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%22Thompson%2C%20Marshall%20R.%22%29&pagesize-30">Thompson, Marshall R. (committee member), Champaign%22%20%2Bcontributor%3A%28%22Jasiuk%2C%20Iwona%20M.%22%29&pagesize-30">Jasiuk, Iwona M. (committee member), Champaign%22%20%2Bcontributor%3A%28%22Yin%2C%20Huiming%22%29&pagesize-30">Yin, Huiming (committee member).

Subjects/Keywords: Micromechanics; Differential scheme; particulate composite; Hot-Mix Asphalt; Complex modulus; Stiffening

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

APA (6^th Edition):

Kim, M. (2010). Development of differential scheme micromechanics modeling framework for predictions of hot-mix asphalt (HMA) complex modulus and experimental validations. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/14609

Chicago Manual of Style (16^th Edition):

Kim, Minkyum. “Development of differential scheme micromechanics modeling framework for predictions of hot-mix asphalt (HMA) complex modulus and experimental validations.” 2010. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed January 16, 2021. http://hdl.handle.net/2142/14609.

MLA Handbook (7^th Edition):

Kim, Minkyum. “Development of differential scheme micromechanics modeling framework for predictions of hot-mix asphalt (HMA) complex modulus and experimental validations.” 2010. Web. 16 Jan 2021.

Vancouver:

Kim M. Development of differential scheme micromechanics modeling framework for predictions of hot-mix asphalt (HMA) complex modulus and experimental validations. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2010. [cited 2021 Jan 16]. Available from: http://hdl.handle.net/2142/14609.

Council of Science Editors:

Kim M. Development of differential scheme micromechanics modeling framework for predictions of hot-mix asphalt (HMA) complex modulus and experimental validations. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2010. Available from: http://hdl.handle.net/2142/14609

University of Illinois – Urbana-Champaign

18. Huang, Hai. Discrete element modeling of railroad ballast using imaging based aggregate morphology characterization.

Degree: PhD, 0106, 2010, University of Illinois – Urbana-Champaign

URL: http://hdl.handle.net/2142/16060

► Ballast is an essential layer of the railroad track structure, and provides primarily drainage and load distribution. In general, ballast aggregates are considered as uniformly… (more)

▼ Ballast is an essential layer of the railroad track structure, and provides primarily drainage and load distribution. In general, ballast aggregates are considered as uniformly graded, angular shaped with crushed faces. However, various ballast aggregate gradations and particle shapes are in use yet their effects on ballast performances remain unknown. In previous designs and modeling practices, railroad ballast has usually been treated as a homogeneous and continuous layer. This approach is not suitable to model the deformation behavior of the particulate nature railroad ballast aggregates under dynamic moving loads. Further, continuum solutions do not take into account realistically the morphological characteristics of aggregates such as particle size distribution and shapes. A combined digital image and Discrete Element Modeling (DEM) methodology has been developed in this PhD thesis to study effects of aggregate particle size and morphological characteristics on ballast performances. The approach has been calibrated using actual ballast aggregates through laboratory shear box texts and validated by further laboratory as well as field experiments. Using the DEM ballast model, individual effects of aggregate particle size distributions and shape properties on railroad ballast strength, lateral stability, and settlement potential were studied. From the DEM simulation results, it was found that aggregate particle size distribution and shape have significant impact on ballast performances. Ballast with broader size distribution was shown to yield less settlement potential than ballast with more uniformly graded aggregates. Also, ballast with angular aggregate particles were found from the DEM simulations to have higher strength as well as better lateral stability than ballast with rounded aggregate particles due to better stone on stone contact and aggregate interlock. In summary, the developed DEM ballast model has been proven in this PhD research to be a promising tool for studying railroad ballast load and deformation characteristics and could lead to the ultimate goal of designing better ???engineered ballast.??? 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%22Barkan%2C%20Christopher%20P.L.%22%29&pagesize-30">Barkan, Christopher P.L. (committee member), Champaign%22%20%2Bcontributor%3A%28%22Hashash%2C%20Youssef%20M.%22%29&pagesize-30">Hashash, Youssef M. (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%22Ghaboussi%2C%20Jamshid%22%29&pagesize-30">Ghaboussi, Jamshid (committee member).

Subjects/Keywords: Discrete Element Modeling; Railroad Ballast; Digital Image Technology; Track Dynamics

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APA (6^th Edition):

Huang, H. (2010). Discrete element modeling of railroad ballast using imaging based aggregate morphology characterization. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/16060

Chicago Manual of Style (16^th Edition):

Huang, Hai. “Discrete element modeling of railroad ballast using imaging based aggregate morphology characterization.” 2010. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed January 16, 2021. http://hdl.handle.net/2142/16060.

MLA Handbook (7^th Edition):

Huang, Hai. “Discrete element modeling of railroad ballast using imaging based aggregate morphology characterization.” 2010. Web. 16 Jan 2021.

Vancouver:

Huang H. Discrete element modeling of railroad ballast using imaging based aggregate morphology characterization. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2010. [cited 2021 Jan 16]. Available from: http://hdl.handle.net/2142/16060.

Council of Science Editors:

Huang H. Discrete element modeling of railroad ballast using imaging based aggregate morphology characterization. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2010. Available from: http://hdl.handle.net/2142/16060

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