Reversibility of Macroperformance of Virgin Asphalt Binder at Various Aging-Regeneration Stages Based on Rheology
Publication: Journal of Materials in Civil Engineering
Volume 35, Issue 11
Abstract
In order to effectively evaluate the regeneration effects of different rejuvenators on aged asphalt binder, this study carried out a series of tests and evaluations on the macroperformance of virgin asphalt binder at various aging-regeneration stages. A commercial rejuvenator, aromatic oil, and warm mix agent were selected as rejuvenators. Fifteen asphalt binder samples involved various aging methods, including water-ultraviolet aging, water-free ultraviolet aging, rolling thin film oven test (RTFOT), and accelerated aging by pressurized aging vessel (PAV). High-temperature properties of asphalt binders were evaluated by softening point, and low-temperature properties of asphalt binders were evaluated by stiffness modulus and m-value. The viscoelastic properties were evaluated by complex modulus . Test results show that the regeneration effects of different rejuvenators were reflected in the reduction of softening point, stiffness modulus, and complex modulus. Based on performance changes of asphalt binder before and after aging, the reversibility indexes , , , and for quantitative evaluation of macroperformance of rejuvenated asphalt binders were proposed. Through linear fitting, it was found that between the reversibility index and the reversibility index reached 0.7574, and between and reached 0.8683. This provided the possibility of mutual transformation between those reversibility indexes. Last, the macroreversibility index of virgin asphalt binder (ARIV) was proposed. The softening point and stiffness modulus were taken as representative indexes to comprehensively evaluate the recovery of high-temperature, low-temperature, and viscoelastic properties of aged asphalt binder by different rejuvenators. This study provided a unified indicator to quantitatively evaluate the regeneration effect of rejuvenator on virgin asphalt binder. It is helpful for better understanding the aging-regeneration process of virgin asphalt binder and determining the optimum regeneration time and rejuvenator.
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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
This study was supported by National Key Research and Development Program of China (2022YFE0137300), National Natural Science Foundation of China (52078018), and Key Technology Research in Shandong Province - Open Competition Mechanism to Select the Best Candidates Project (2021-KJ-068).
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Information & Authors
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Published In
Journal of Materials in Civil Engineering
Volume 35 • Issue 11 • November 2023
Copyright
© 2023 American Society of Civil Engineers.
History
Received: Nov 30, 2022
Accepted: Mar 29, 2023
Published online: Aug 25, 2023
Published in print: Nov 1, 2023
Discussion open until: Jan 25, 2024
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