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Mechanical performance and fatigue crack growth behavior of polymer-modified asphalt concrete mixtures

Othman, Ayman Mahmoud
http://rave.ohiolink.edu/etdc/view?acc_num=case1058531669

Abstract Details

1995, Doctor of Philosophy, Case Western Reserve University, Civil Engineering.
The mechanical performance and fatigue crack growth behavior of SBS modified asphalt concrete mixtures subjected to varying loading and environmental conditions were studied. Paris' and the Modified Crack Layer (MCL) models have been used to characterize the resistance of asphalt concrete mixtures to fatigue crack propagation. Both models successfully discriminate the effect of processing conditions on the fracture resistance of the AC-20 asphalt concrete mixtures as well as the effect of SBS content on the fracture resistance of the modified AC-5 mixture. SEM examination of the fracture surface of the SBS modified mixtures revealed ridge formation in binder rich areas which increases in intensity with the SBS percent in the mixture. Using AC-20 asphalt concrete mixture, the current study demonstrates the dependency of the Paris' and the MCL models parameters on the level of stress during fatigue loading. Fatigue crack growth analysis of SBS modified mixtures at various temperatures also revealed that Paris' model parameters (C* and m*) are both independent of temperature. However, the MCL model indicates only the consistency of the specific energy of damage γ′ with temperature, while the dissipative coefficient β′ showed d ependency on the temperature. The accumulated dissipated energy through fatigue failure which is introduced in this research as a fracture criteria, was correlated to fatigue life through temperature independent parameters. A cyclic thermal aging program was performed in an environmental chamber between 0° F and 70° F for five different numbers of cycles. The current investigation revealed that the SBS modifier helps maintain a constant fatigue resistance of the mixture over a moderate number of low temperature thermal cycles. A decrease in the fatigue resistance was observed at higher number of thermal cycles. The fatigue performance of the mixtures as predicted from Paris' and the MCL models was found to be consistent with what was predicted from the conventional indirect tensile strength and the critical energy release rate (J1c).
J. Figueroa (Advisor)
196 p.
Engineering, Civil
Polymer asphalt concrete; mechanical performance and crack growth

Recommended Citations

Citations

  • Othman, A. M. (1995). Mechanical performance and fatigue crack growth behavior of polymer-modified asphalt concrete mixtures [Doctoral dissertation, Case Western Reserve University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=case1058531669

    APA Style (7th edition)

  • Othman, Ayman. Mechanical performance and fatigue crack growth behavior of polymer-modified asphalt concrete mixtures. 1995. Case Western Reserve University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=case1058531669.

    MLA Style (8th edition)

  • Othman, Ayman. "Mechanical performance and fatigue crack growth behavior of polymer-modified asphalt concrete mixtures." Doctoral dissertation, Case Western Reserve University, 1995. http://rave.ohiolink.edu/etdc/view?acc_num=case1058531669

    Chicago Manual of Style (17th edition)

case1058531669
1,089
© 1995, all rights reserved.
This open access ETD is published by Case Western Reserve University School of Graduate Studies and OhioLINK.
Release 3.2.12