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Laboratory Evaluation and Numerical Simulation to Enhance the Sustainability of Pavements Structures

Al-Hosainat, Ahmad Ghazi Jamil
http://orcid.org/0000-0002-8471-9631
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1657796433911859

Abstract Details

2022, PhD, University of Cincinnati, Engineering and Applied Science: Civil Engineering.
In this dissertation, the sustainability of asphalt pavements was investigated in three different aspects. The first part presents the first research study to evaluate the effect of adding different contents of recycled Polyethylene Tetraphthalate (PETE) to the asphalt binder on the rheological and mechanical properties of the modified binder as well as the agglomeration behavior between PETE and asphalt binder at macro-, micro-, and atomistic scales using Superpave rheological tests, Atomic Force Microscope (AFM) testing, and molecular dynamics (MD) simulation, respectively. Results indicated that Addition of PETE enhanced the high and intermediate temperature rheological properties of the PG 64-22 binder. The low-temperature rheological properties and resistance to cracking decreased slightly with increasing the PETE content in the binder. However, this reduction was not remarkable when adding 4%, 8%, or 10% PETE contents. AFM results indicated that the inclusion of PETE improved the stiffness properties and increased the roughness, reduced modulus, and bonding energy of the modified binders as compared to the control binder. MD simulation indicated that the molecular agglomeration between PETE and light asphalt binder components increased when increasing the PETE content, with highest RDF values indicated for 10% PETE modified binder. The second part of this dissertation presents the first study to evaluate the effects using tack coat material and other factors on the interlayer bond strength between the field constructed or laboratory prepared micro-surfacing single or double layers and existing pavement surface. The bond strength between micro-surfacing layer(s) and the existing pavement surface was measured in the laboratory using two types of pull-off tests and a torque bond strength test. Results indicated that samples with no tack coat had significantly lower bond strength than those with tack coat with at least 0.05 gsy total application rate. Furthermore, results indicated that using 0.75% lower residual asphalt binder content in micro-surfacing mixes resulted in significantly lower bond strength between the micro-surfacing and existing pavement. The tack coat material properties had some effect on the interlayer bond strength; however, this effect was statistically insignificant. The use of double micro-surfacing layers generally resulted in lower bond strength compared to the use of a single layer for micro-surfacing application. In addition, the bond strength was not significantly affected by the existing pavement surface texture. The third part summarizes the results of a research project that was conducted to evaluate the performance of aramid fiber-reinforced asphalt mixtures and compare it to that of polymer-modified asphalt mixtures. Two aramid fibers from different sources were selected. Results indicated that the effects of adding aramid fibers to asphalt mixture vary depending on type of aramid fiber and mixture properties. In general, both fiber types significantly improved the cracking resistance of mixtures with PG 64-22 to have a similar or higher cracking resistance as those with PG 70-22M binder. The fibers did not improve the low-temperature cracking resistance of asphalt mixtures. The statistical analysis of the test results indicated that the properties related to the cracking resistance of the fiber mixtures did not significantly change during production.
Munir Nazzal, Ph.D. (Committee Member)
Matthew Steiner, Ph.D. (Committee Member)
Nabil Nassif (Committee Member)
Sara Khoshnevisan, Ph.D. (Committee Member)
232 p.
Engineering
PETE; Rheology; Atomic Force Microscopy; Bond strength; Microsurfacing; Aramid Fiber

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Citations

  • Al-Hosainat, A. G. J. (2022). Laboratory Evaluation and Numerical Simulation to Enhance the Sustainability of Pavements Structures [Doctoral dissertation, University of Cincinnati]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1657796433911859

    APA Style (7th edition)

  • Al-Hosainat, Ahmad Ghazi Jamil. Laboratory Evaluation and Numerical Simulation to Enhance the Sustainability of Pavements Structures. 2022. University of Cincinnati, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ucin1657796433911859.

    MLA Style (8th edition)

  • Al-Hosainat, Ahmad Ghazi Jamil. "Laboratory Evaluation and Numerical Simulation to Enhance the Sustainability of Pavements Structures." Doctoral dissertation, University of Cincinnati, 2022. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1657796433911859

    Chicago Manual of Style (17th edition)

ucin1657796433911859
41
© 2022, some rights reserved.Creative Commons License Laboratory Evaluation and Numerical Simulation to Enhance the Sustainability of Pavements Structures by Ahmad Ghazi Jamil Al-Hosainat is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License. Based on a work at etd.ohiolink.edu.
This open access ETD is published by University of Cincinnati and OhioLINK.