Low-Temperature and Fatigue Characteristics of Degraded Crumb Rubber–Modified Bitumen Before and After Aging
Publication: Journal of Materials in Civil Engineering
Volume 34, Issue 3
Abstract
The high viscosity and poor storage stability of crumb rubber–modified asphalt (CRMA) can be partially addressed by the appropriate degree of degradation of the crumb rubber modifier. However, the low-temperature and fatigue characteristics of degraded crumb rubber–modified bitumen (DCRMB) in different aging states are not well understood. In this study, two types of DCRMB—namely, terminal blend rubberized asphalt (TBRA) and terminal blend hybrid asphalt (TBHA)—were prepared with sulfur, styrene-butadiene-styrene (SBS) polymer, and crumb rubber (CR). All DCRMB binders were short-term aged with a rolling thin film oven test (RTFOT) and long-term aged with a pressure aging vessel (PAV). Afterward, a bending beam rheometer (BBR) test and a linear amplitude sweep (LAS) test were conducted to characterize the low-temperature and fatigue properties of DCRMB binders at different aging degrees, respectively. Based on the rheological test results, several conclusions can be drawn. First, the BBR results indicated that the increase in CR content led to a slight increase in creep rate and a significant decrease in stiffness. Especially in PAV aging, the low-temperature properties of DCRMB were much better than those of neat asphalt. Meanwhile, DCRMB demonstrated an advantage over neat asphalt in integrity and fatigue resistance before and after aging. Finally, based on correlation analysis, the LAS test is recommended for evaluating the fatigue properties of DCRMB before and after aging.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
The authors appreciate financial support from the National Natural Science Foundation of China (Grant No. 51978518).
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Published In
Journal of Materials in Civil Engineering
Volume 34 • Issue 3 • March 2022
Copyright
© 2021 American Society of Civil Engineers.
History
Received: May 10, 2021
Accepted: Jul 30, 2021
Published online: Dec 30, 2021
Published in print: Mar 1, 2022
Discussion open until: May 30, 2022
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