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Comprehensive Evaluation of Permanent Deformation Behavior for Asphalt Mixtures under High Stresses

Saqer, Hamzeh
http://orcid.org/0000-0003-2190-9021
http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1557235662629231

Abstract Details

2019, Master of Science (MS), Ohio University, Civil Engineering (Engineering and Technology).
In the last decades, the world has witnessed a drastic increase in traffic volumes and truck weights. The pressure of increasing traffic volumes and weights introduces more issues into the roadway system, but civil engineers can help in designing more efficient and durable pavements. Asphalt pavement is the predominant type of pavement in the world. However, it suffers from different distresses during its lifetime due to traffic and environmental conditions. One of the major distresses of asphalt pavement is rutting, and it is primarily a load-related distress. Asphalt mixtures that can provide high resistance to rutting are needed, especially for high stress locations, such as airports and intersections. In this thesis, an asphalt mixture was designed to have high resistance to permanent deformation under high stresses. In addition, different asphalt mixtures were produced and evaluated using different polymer-modified and GTR-modified asphalt binders. The polymer-modified binders were graded as PG70-22M, PG 76-22M, and PG 88-22M, while the GTR-modified binder was graded as PG 70-22M. The produced mixes were evaluated for their performance by conducting an extensive laboratory testing program. The laboratory testing program was conducted in two phases. Phase 1 was performed on lab-produced mixes, while phase 2 was performed on plant-produced mixes. A control mix, typically used for interstate surface course in Ohio, was included in phase 1 to provide a baseline for comparison. One of the GTR mixes included in phase 2 contained excessive amounts of natural sand and was expected to exhibit premature rutting. The mixtures’ resistance to permanent deformation, moisture damage, and cracking were evaluated using a variety of tests. The flow number, asphalt pavement analyzer, Hamburg wheel-tracking device, modified Lottman test, and semi-circular bending test were employed to assess the performance of mixes included in the study. Statistical analysis was performed on all test results to provide ranking based on mixtures’ performance in these tests. Using different asphalt binders allowed to investigate the effect of using different binder grades on asphalt pavement performance. The results of the study indicate that the designed asphalt mixture showed adequate resistance to permanent deformation, moisture damage, and cracking. The designed mix made using PG 88-22M provided superior properties compared to other mixes included in the study. Furthermore, the dissipated energy concept was used to explain the permanent deformation behavior of asphalt mixes. It was found to provide information about the degree of internal damage occurring during the repeated axial load test. It was able to identify different phases in asphalt pavement behavior: consolidation, stability, and failure. A new proposed method of determining the flow number was developed based on the change in dissipated energy during repeated load tests. One main advantage of using the dissipated energy approach is that it reflects both strength and deformational state of the specimen as the number of load cycles increases. Ranking of mixtures based on the dissipated energy approach was in good agreement with that resulting from the flow number test, which validates the use of this method.
Munir Nazzal (Advisor)
99 p.
Civil Engineering; Geotechnology; Transportation
Rutting; airport mix; dissipated energy; polymer-modified asphalt; GTR

Recommended Citations

Citations

  • Saqer, H. (2019). Comprehensive Evaluation of Permanent Deformation Behavior for Asphalt Mixtures under High Stresses [Master's thesis, Ohio University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1557235662629231

    APA Style (7th edition)

  • Saqer, Hamzeh. Comprehensive Evaluation of Permanent Deformation Behavior for Asphalt Mixtures under High Stresses. 2019. Ohio University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1557235662629231.

    MLA Style (8th edition)

  • Saqer, Hamzeh. "Comprehensive Evaluation of Permanent Deformation Behavior for Asphalt Mixtures under High Stresses." Master's thesis, Ohio University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1557235662629231

    Chicago Manual of Style (17th edition)

ohiou1557235662629231
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This open access ETD is published by Ohio University and OhioLINK.