Microstructure, Fatigue, and Self-Healing Properties of SBS-Modified Asphalt under Ultraviolet Radiation
Publication: Journal of Materials in Civil Engineering
Volume 35, Issue 7
Abstract
Asphalt gradually deteriorates under the influence of ultraviolet light, especially at high altitudes or low latitudes, significantly shortening the service life of pavements. In this study, styrene-butadiene-styrene copolymer–modified asphalt was selected to investigate the effects of ultraviolet aging on the basic indexes and micromorphology of asphalt, as well as on the fatigue performance and self-healing ability of asphalt mixtures. The experimental results indicate that ultraviolet radiation exposure increased the content of polar molecules in the asphalt, which gradually aggregated, and the surface roughness of the asphalt increased. With the prolongation of irradiation time, the average value and dispersion degree of Young’s modulus associated with the asphalt surface gradually increased. Moisture accelerated the aging of asphalt, increasing penetration and surface roughness; however, it prevented the aggregation of polar molecules. Ultraviolet light weakened the fatigue properties of asphalt mixtures, and the self-healing effect after fatigue gradually deteriorated. The self-healing effect of the asphalt mixture was inversely proportional to the degree of aging and damage, and was proportional to the healing temperature and healing time.
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Data Availability Statement
All of the data, models, and code generated or used during the study appear in the published article.
Acknowledgments
This research was financially supported by Basic Scientific Research Expenses Program of universities directly under Inner Mongolia Autonomous Region (Grant No. JY20220297 and JY20220005) and National Natural Science Foundation of China (Grant No. 52168063).
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Published In
Journal of Materials in Civil Engineering
Volume 35 • Issue 7 • July 2023
Copyright
© 2023 American Society of Civil Engineers.
History
Received: Aug 20, 2022
Accepted: Oct 28, 2022
Published online: Apr 17, 2023
Published in print: Jul 1, 2023
Discussion open until: Sep 17, 2023
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