| 生物油再生沥青自愈合机理分析（双语出版） |
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| 引用本文： | 高新文,刘朝晖.生物油再生沥青自愈合机理分析（双语出版）[J].中国公路学报,2019,32(4):235-242. |
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| 作者姓名： | 高新文 刘朝晖 |
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| 作者单位： | 1. 长沙理工大学 交通运输工程学院, 湖南 长沙 410004;
2. 山西省交通运输厅, 山西 太原 030002 |
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| 基金项目： | 山西省重点研发计划-国际合作项目（201603D421027）；山西省科技成果转化引导专项项目（201804D131034）；山西交通控股集团有限公司科技项目（18-JKKJ-13） |
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| 摘 要： | 对再生沥青进行流变性能测试、微观结构表征、结构特性分析及宏观性能测试，研究生物油对老化沥青自愈合性能的影响，建立了再生沥青微观结构和宏观性能的构效关系。借助分子动力学软件及Wool-O'Connor自愈合模型计算得到最佳愈合温度时的最短愈合时间。研究结果表明：生物油再生沥青（BRA）的愈合行为包括黏性流动和弹性恢复，在高温（60℃和80℃）环境下，BRA的愈合行为取决于黏性流动，而在低温（20℃和40℃）环境下BRA的愈合行为取决于弹性恢复。在60℃的愈合试验温度、5%的疲劳应变条件下，BRA的最佳愈合时间为30 min，最短完全愈合时间为32 min；试验结果和模型计算结果相近，自愈合模型可较好地分析BRA的完全愈合时间。老化3年、5年、10年的BRA在其最佳愈合温度时的最短愈合时间分别为32，52，78 min，表明生物油可在一定程度上提高旧路面老化沥青的部分自愈合性能。
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| 关 键 词： | 道路工程 自愈合机理 分子动力学 生物油沥青 疲劳-愈合-再疲劳 |
| 收稿时间： | 2018-03-26 |
Self-healing Mechanism of Bio-oil Recycled Asphalt（in English） |
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| GAO Xin-wen,LIU Zhao-hui.Self-healing Mechanism of Bio-oil Recycled Asphalt（in English）[J].China Journal of Highway and Transport,2019,32(4):235-242. |
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| Authors: | GAO Xin-wen LIU Zhao-hui |
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| Affiliation: | 1. School of Traffic & Transportation Engineering, Changsha University of Science & Technology, Changsha 410004, Hunan, China;
2. Department of Transportation of Shanxi Province, Taiyuan 030002, Shanxi, China |
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| Abstract: | 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. |
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| Keywords: | road engineering self-healing mechanism molecular dynamic bio-oil recycled asphalt fatigue-healing-fatigue |
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