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You searched for subject:(Pavement Preservation). Showing records 1 – 2 of 2 total matches.

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University of Minnesota

1. Ghosh, Debaroti. Experimental Investigation of Bio-sealants Used for Pavement Preservation and Development of a New Strength Test for Asphalt Binders at Low Temperature.

Degree: PhD, Civil Engineering, 2017, University of Minnesota

Surface treatment using sealants as a mean of pavement preservation is an important tool for cost-effectively extending service life of pavement. Sealants have become an important tool for cost-effectively extending the service life pavements. Due to the combined negative effects of asphalt aging and thermal cracking, it is always more challenging to choose an appropriate preservation technique for pavements built in cold-regions. Asphalt aging and thermal cracking negatively affect pavements built in cold climates. Therefore, it is important to evaluate the effects of sealants in laboratory conditions before application in the field to ensure effective performance. However, preservation activities cannot effectively address major distresses, such as low-temperature cracking, that can occur when the pavement was built from the very beginning with less durable materials. Therefore, an essential requirement to mitigate low-temperature cracking of pavements for asphalt materials used in the construction of pavement built in cold- regions is ensuring proper fracture properties of the asphalt materials used in construction. This study has two parts. In the first part, a laboratory evaluation of the effects of adding bio-sealants to both asphalt binder and mixture is performed. The goal is to obtain relevant properties of treated asphalt materials to understand the mechanism by which sealants improve pavement performance. For asphalt binders, a dynamic shear rheometer and a bending beam rheometer were used to obtain rheological properties of treated and untreated asphalt binders. For asphalt mixtures, field cores from both untreated and treated sections were collected and thin beam specimens were prepared from the cores to compare the creep and strength properties of the field-treated and laboratory-treated mixture. It is observed that the oil-based sealants have a significant softening effect on the control binder compared to the water-based sealant and traditional emulsion. Oil-based sealants increased rutting and fatigue potential of the binder and helped the low-temperature cracking resistance. For asphalt mixtures, different trends are observed for the field samples compared to the laboratory prepared samples. Similar to binder results, significant differences are observed between the asphalt mixtures treated with oil-based and water-based sealants, respectively. Additional analyses were performed to better understand the sealant effects. Fourier transform infrared spectroscopy (FTIR) analysis showed that the sealant products could not be detected in mixture samples collected from the surface of the treated section. Semi-empirical Hirsch model was able to predict asphalt mixture creep stiffness from binder stiffness. The results of a distress survey of the test sections correlated well with the laboratory findings. In the second part, a news binder strength testing method is proposed with the goal to provide an effective tool for selecting asphalt binders that are crack resistant. A modified Bending Beam Rheometer…

Subjects/Keywords: Bending Beam Rheometer; Binder Strength; Bio-Sealant; Dynamic Rheometer; Pavement Preservation; Rheology

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

APA (6th Edition):

Ghosh, D. (2017). Experimental Investigation of Bio-sealants Used for Pavement Preservation and Development of a New Strength Test for Asphalt Binders at Low Temperature. (Doctoral Dissertation). University of Minnesota. Retrieved from http://hdl.handle.net/11299/192677

Chicago Manual of Style (16th Edition):

Ghosh, Debaroti. “Experimental Investigation of Bio-sealants Used for Pavement Preservation and Development of a New Strength Test for Asphalt Binders at Low Temperature.” 2017. Doctoral Dissertation, University of Minnesota. Accessed June 18, 2018. http://hdl.handle.net/11299/192677.

MLA Handbook (7th Edition):

Ghosh, Debaroti. “Experimental Investigation of Bio-sealants Used for Pavement Preservation and Development of a New Strength Test for Asphalt Binders at Low Temperature.” 2017. Web. 18 Jun 2018.

Vancouver:

Ghosh D. Experimental Investigation of Bio-sealants Used for Pavement Preservation and Development of a New Strength Test for Asphalt Binders at Low Temperature. [Internet] [Doctoral dissertation]. University of Minnesota; 2017. [cited 2018 Jun 18]. Available from: http://hdl.handle.net/11299/192677.

Council of Science Editors:

Ghosh D. Experimental Investigation of Bio-sealants Used for Pavement Preservation and Development of a New Strength Test for Asphalt Binders at Low Temperature. [Doctoral Dissertation]. University of Minnesota; 2017. Available from: http://hdl.handle.net/11299/192677

2. King, Daniel E. Surface and microstructural properties of photocatalytic cements for pavement applications.

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

Thin concrete inlays incorporating flowable fibrous concrete (FFC) mix designs as well as titanium dioxide (TiO2)-containing photocatalytic cements are a promising pavement preservation solution. These multi-functional inlays offer enhanced constructability and structural properties while also benefiting the environment by reacting with harmful nitrogen oxides (NOx) and removing them from the near-road environment. Photocatalytic FFC mixes were prepared in the laboratory to verify feasibility of field application and to characterize how mixture and microstructural properties and environmental factors affect photocatalytic performance. Testing of fresh and hardened concrete confirmed the ease of application of photocatalytic FFC and its benefits to the pavement's structural properties, particularly to residual strength ratio and fracture toughness. Laboratory photoreactor testing of mortar samples established that photocatalytic FFC is an effective tool to mitigate NOx pollution in the urban environment. Carbonation of the sample surface was shown to have the potential to significantly reduce NOx removal ability, but this effect could be curtailed by replacing some of the cement with fly ash or increasing TiO2 content by mass of cement. Spectrophotometer testing showed that reflectance of the mortar samples also factored into photocatalytic performance. More reflective specimens demonstrated greater NOx removal ability, which was most apparent when comparing the performance of white cement specimens to gray cement specimens. Finally, analysis of cement paste specimens using scanning electron microscopy (SEM) and related techniques suggested the importance of porosity to photocatalytic ability. These findings will be useful in helping design and optimize photocatalytic concrete mix designs for applications in pavements and other structures. Based on the results of the mixes and materials tested, a white cement photocatalytic concrete with 15% fly ash replacement would offer the most optimal balance between high photocatalytic efficiency and resilience to carbonation. Advisors/Committee Members: Roesler, Jeffery R (advisor).

Subjects/Keywords: Photocatalytic Concrete; Photocatalytic Cement; Titanium Dioxide; Pavement Preservation; Concrete Overlays; Sustainability; Albedo

…feasibility of incorporating photocatalytic cements into thin FFC inlays for pavement preservation… …preservation and minor rehabilitation of pavements. Preservation is a strategy to enhance pavement… …used for pavement preservation (Peshkin et al. 2011). Flowable fibrous concrete… …single edge notched beam specimen. 2.6. CONCLUSIONS Thin inlays for pavement preservation have… …the pavement structure, it may be possible to improve air quality by attacking the problem… 

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

APA (6th Edition):

King, D. E. (2016). Surface and microstructural properties of photocatalytic cements for pavement applications. (Thesis). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/92656

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

Chicago Manual of Style (16th Edition):

King, Daniel E. “Surface and microstructural properties of photocatalytic cements for pavement applications.” 2016. Thesis, University of Illinois – Urbana-Champaign. Accessed June 18, 2018. http://hdl.handle.net/2142/92656.

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

MLA Handbook (7th Edition):

King, Daniel E. “Surface and microstructural properties of photocatalytic cements for pavement applications.” 2016. Web. 18 Jun 2018.

Vancouver:

King DE. Surface and microstructural properties of photocatalytic cements for pavement applications. [Internet] [Thesis]. University of Illinois – Urbana-Champaign; 2016. [cited 2018 Jun 18]. Available from: http://hdl.handle.net/2142/92656.

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

Council of Science Editors:

King DE. Surface and microstructural properties of photocatalytic cements for pavement applications. [Thesis]. University of Illinois – Urbana-Champaign; 2016. Available from: http://hdl.handle.net/2142/92656

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

.