Fatigue Behavior and Healing Properties of Aged Asphalt Binders
Publication: Journal of Materials in Civil Engineering
Volume 34, Issue 7
Abstract
This study aims to investigate the fatigue behavior and healing properties of aged asphalt binders. Both 70# and SBS-modified asphalt binders were aged using a rolling thin-film oven test (RTFOT), and their physical properties were analyzed. Their fatigue behavior and healing properties were investigated using a dynamic-shear-rheometer time-sweep test. The influence of healing on fatigue behavior was evaluated in terms of the fatigue life ratio (FLR), and a new index was defined (accumulated dissipation-energy ratio, ADER) to evaluate the healing properties of aged asphalt binders. Aging reduced the penetration and ductility of both the asphalt binders, and large aging degrees increased their softening points. Small aging degrees slightly decreased the softening point of the SBS-modified asphalt binder but increased that of 70# asphalt binder. The former had a better thermal-oxidative aging resistance than the latter. Aging increased the complex shear modulus of the binders, resulting in a longer fatigue life under controlled-stress conditions. The fatigue life of aging asphalt binders obeyed a good () double-logarithmic linear relationship with the stress level. Healing recovers the asphalt complex shear modulus and extends its fatigue life. Additionally, the FLR and ADER increased with a decrease in aging degree and an increase in the healing period.
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Data Availability Statement
Some or all data that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
The work described in this paper is supported by the Open Fund Project of the State Key Laboratory of Road Engineering Safety and Health in Alpine and High-Altitude Areas (YGY 2017 KYPT-02), the Postgraduate Research Innovation Project of Chongqing (CYB21211).
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Journal of Materials in Civil Engineering
Volume 34 • Issue 7 • July 2022
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Aug 13, 2021
Accepted: Oct 27, 2021
Published online: Apr 19, 2022
Published in print: Jul 1, 2022
Discussion open until: Sep 19, 2022
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Cited by
- Fuquan Ma, Fengxia Chi, Hui Li, Xue Luo, Yuqing Zhang, Zhiyi Huang, Kinetics-based formulation of relationship between healing and ageing of asphalt binder, International Journal of Pavement Engineering, 10.1080/10298436.2022.2120992, (1-13), (2022).