Self-healing Mechanism of Bio-oil Recycled Asphalt

被引：0
|
作者：
Gao X.-W. [1 ,2 ]
Liu Z.-H. [1 ]
机构：
[1] School of Traffic & Transportation Engineering, Changsha University of Science & Technology, Changsha, 410004, Hunan
[2] Department of Transportation of Shanxi Province, Taiyuan, 030002, Shanxi
来源：
Zhongguo Gonglu Xuebao/China Journal of Highway and Transport | 2019年 / 32卷 / 04期
关键词：
Bio-oil recycled asphalt; Fatigue-healing-fatigue; Molecular dynamic; Road engineering; Self-healing mechanism;
D O I：
10.19721/j.cnki.1001-7372.2019.04.021
中图分类号：
学科分类号：
摘要：
To understand the self-healing mechanism of bio-oil recycled asphalt (BRA), rheological properties, microstructure characteristics, and macroscopic properties of recycled asphalt were studied. The structure-function relationship between the microstructure and the macroscopic properties of recycled asphalt was established. Molecular dynamics software and Wool-O'Connor model were used to calculate the shortest healing temperature and minimum healing time. The self-healing mechanism of BRA includes viscous flow and elastic recovery. Viscous flow was dominant at high temperatures (60℃ and 80℃), near the softening point; elastic recovery was dominant at lower temperatures (20℃ and 40℃); and the two healing mechanisms operated simultaneously at 60℃ and 80℃. The optimum healing time and shortest complete healing time for BRA are 30 min and 32 min, respectively, when the healing temperature is 60℃ and the fatigue strain is 5%. The results of the experiment were similar to that of Wool-O'Connor's model. The self-healing model can be used to analyze the complete healing time of BRA. The shortest complete healing times of BRA, aged for 3, 5, and 10 years, were 32, 52, and 78 min, respectively. Moreover, bio-oil could improve the self-healing properties of asphalt, which was partially extracted from an old asphalt pavement. © 2019, Editorial Department of China Journal of Highway and Transport. All right reserved.
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页码：235 / 242
页数：7
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