Abstract
This paper investigates the damage-healing properties of unmodified and polymer modified asphalt binders under different aging levels using newly developed linear amplitude sweep based healing (LASH) test. One neat asphalt 70# and one Styrene-Butadiene-Styrene (SBS) modified asphalt are selected in this study. The original binders are subjected to the Rolling Thin Film Oven (RTFO) and Pressurized Aging Vessel (PAV) tests for stimulating the short- and long-term aging of asphalt binders during the pavement construction and service phases. Through the LASH tests under different aging levels of the two binders, it is found that the damage-healing performance of both neat and modified asphalt binders gradually decrease with the increasing aging levels. It is also observed that the healing performance of 70# neat asphalt is higher than that of SBS binder in pre-failure conditions, however, the healing behaviors of SBS binder is becoming obviously better than that of 70# binder after fatigue failure. Furthermore, a promising relationship is found between the macroscale healing properties of asphalt binders and their microscale chemical composition under various aging levels.
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Acknowledgements
The authors would like to gratefully acknowledge the sponsorship from National Natural Science Foundation of China (51608018), Beijing Municipal Education Commission (KM201810005020) and Beijing Natural Science Foundation (8174059).
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Chen, Y., Wang, C. (2020). Oxidative Aging Effects on Damage-Healing Performance of Unmodified and Polymer Modified Asphalt Binders. In: Pasetto, M., Partl, M., Tebaldi, G. (eds) Proceedings of the 5th International Symposium on Asphalt Pavements & Environment (APE). ISAP APE 2019. Lecture Notes in Civil Engineering, vol 48. Springer, Cham. https://doi.org/10.1007/978-3-030-29779-4_39
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DOI: https://doi.org/10.1007/978-3-030-29779-4_39
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