Effect of Healing Conditions on Fatigue-Healing of Asphalt Binder and Asphalt Mixture
Publication: Journal of Materials in Civil Engineering
Volume 32, Issue 5
Abstract
To study the effects that healing conditions have on the fatigue-healing properties of asphalt materials, we conducted a fatigue-healing-fatigue test on asphalt materials using a dynamic shear rheometer and four-point bending-fatigue-testing machine. We analyzed the changes in the fatigue-healing properties of the asphalt materials with exposure to different healing conditions. The results showed that the fatigue-healing performance of the styrene butadiene styrene (SBS)-modified asphalt and asphalt mixture was better than those of the #70 asphalt and asphalt mixture. Increases in the healing temperature, within a certain range, promoted the healing of the asphalt mixture. Excessive temperatures led to asphalt aging and inhibited healing. The optimal healing temperatures for the #70 asphalt and SBS-modified asphalt mixtures were 50°C and 60°C, respectively. Extending the healing time was beneficial to healing. The healing efficiency decreased with an increase in the healing time. The most effective healing times for the asphalt binder and asphalt mixture were approximately 30 min and 12 h, respectively. We do not advise the excessive prolongation of the healing time to pursue a 100% healing recovery.
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Data Availability Statement
All data, models, or code generated or used during the study are available from the corresponding author by request.
Acknowledgments
The investigation described in this paper is supported by the National Natural Science Foundation of China (51278513) and the Maintenance Technology Project of Qilu Transportation Development Group Co., Ltd. in 2018, China (2018YHKY-01), which are greatly acknowledged.
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Published In
Journal of Materials in Civil Engineering
Volume 32 • Issue 5 • May 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: Apr 18, 2019
Accepted: Sep 23, 2019
Published online: Feb 20, 2020
Published in print: May 1, 2020
Discussion open until: Jul 20, 2020
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