Investigation on Self-Healing Behavior of Asphalt Binder Using a Six-Fraction Molecular Model
Publication: Journal of Materials in Civil Engineering
Volume 31, Issue 5
Abstract
The service life of asphalt pavement is influenced by many factors, of which the properties of asphalt binder are the most important. The self-healing properties of asphalt binder counteract the progression of fatigue and have been studied using experiments and molecular dynamics (MD) simulations by numerous researchers to ultimately extend the service life of asphalt pavements. In this paper, asphalt binder is separated into six fractions (saturates, monoaromatics, diaromatics, polyaromatics, resins, and asphaltenes). Then a six-fraction model of asphalt binder is created and employed to investigate the self-healing behavior of asphalt binder. The effect of crack width, temperature, and state of molecular aggregation, as well as aggregate on the self-healing process of asphalt binder is studied on a microscale by means of MD simulations. The results show that these factors have influences on the self-healing behavior of asphalt binder; in addition, graphene is found to exhibit some positive impacts on the self-healing process of asphalt binder.
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Acknowledgments
This paper is based on a part of the research project carried out at the request of the German Research Foundation (DFG), under research project No. OE 514/1-2 (FOR 2089), and the National Science Foundation of China (Grant No. 51708026). The China Scholarship Council (CSC No.: 201408080059) is also gratefully acknowledged. The authors are solely responsible for the content.
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Published In
Journal of Materials in Civil Engineering
Volume 31 • Issue 5 • May 2019
Copyright
©2019 American Society of Civil Engineers.
History
Received: Jun 5, 2018
Accepted: Oct 22, 2018
Published online: Mar 13, 2019
Published in print: May 1, 2019
Discussion open until: Aug 13, 2019
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