Interface Transformation Behavior of Bonding/Lubrication of Aggregate-Asphalt System
Publication: Journal of Materials in Civil Engineering
Volume 32, Issue 12
Abstract
Asphalt binder is very sensitive to temperature and exhibits bonding or lubrication effects at different temperatures. The bonding/lubrication properties of asphalt affect the mixing, compaction, and service performance of asphalt mixture. To analyze the interface bonding/lubrication transformation behavior of aggregate-asphalt systems, the contact-slip test was conducted at different temperatures using a self-developed tester. The maximum slip force was used to evaluate the contact properties of aggregate-asphalt systems. A relational model between the maximum slip force and the temperature was established, and the asphalt content for maximum bonding was proposed. The temperature transition behavior from bonding to lubrication of asphalt was analyzed and delimited, and the critical transition temperature was determined. Test results show that the temperature intervals of lower than 90°C, from 90°C to 150°C, and above 150°C represent the bonding zone, bonding–lubrication zone and lubrication zone, respectively, for the AC-13 aggregate-asphalt system. The critical transition temperature of bonding–lubrication is 120°C. Coarse aggregates are more sensitive to the lubrication effect of asphalt; however, the bonding effect affects the particle system more significantly with an increased content of fine aggregates. The structural stability of an aggregate-asphalt system is more sensitive to the bonding part, so the interface strength formed by the coupling of the contact friction effect of the particle system and the bonding and lubrication effect of asphalt increases first and then decreases with increased asphalt content.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
The authors sincerely express our gratitude to the Key Laboratory of Road Structure & Material Ministry of Transport, PRC, for providing test instruments. Also, we gratefully acknowledge the financial support from the National Natural Science Foundation of China (Grant No. 51878061), Applied Basic Research Project Ministry of Transport of China (Grant No. 2014319812151), Natural Science Basic Research Plan in Shaanxi Province of China (Grant No. 2019JM195), and Fundamental Research Funds for the Central Universities (Grant No. 300102210703).
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Published In
Journal of Materials in Civil Engineering
Volume 32 • Issue 12 • December 2020
Copyright
© 2020 American Society of Civil Engineers.
History
Received: Feb 3, 2020
Accepted: Jun 8, 2020
Published online: Sep 25, 2020
Published in print: Dec 1, 2020
Discussion open until: Feb 25, 2021
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