摘要
为了研究植物油微胶囊沥青混合料的微观力学性能及自愈合机制,利用分子动力学方法基于12分子沥青模型构建沥青微裂缝模型,采用植物油提取物油酸、亚油酸以及石油基再生剂乙基四氢化萘作为芯材,探究三种芯材释放后沥青微裂缝的自愈合进程,计算沥青分子的自扩散系数并分析不同芯材的作用机制,同时构建沥青-集料模型,采用粘聚能、粘附能、粘附强度等指标分析融入不同芯材后沥青-集料界面的微观力学性能。结果表明:芯材的释放加速了沥青分子的自扩散,提高了微裂缝的自愈合能力,且微裂缝自愈合能力随温度的升高而增强;与芯材融合后老化沥青的粘聚能和粘附能分别提高了37.2%和36.8%以上,并且老化沥青-集料界面的粘附强度增加;与石油基再生剂相比,植物油能更好地促进微裂缝的愈合。通过分子动力学技术可以更深入地探查微胶囊沥青路面的自愈合机制,从而为微胶囊芯材的设计与选择提供可行的方法。
To study the micromechanical properties and self-healing mechanism of vegetable oil microencapsulated asphalt mixture,the asphalt microcracks model was constructed based on the 12-molecule asphalt model by molecular dynamics methods.Oleic acid,linoleic acid,and ethyl tetralin were used as the core material of the microcapsules.The self-healing process of asphalt microcracks was investigated during the release of core materials.And the self-diffusion coefficients of asphalt molecules were calculated to explore the healing mechanism with different core materials.Moreover,the asphalt-aggregate interface model was constructed,and indexes including cohesion energy,adhesion energy,and adhesion strength were used to analyze the microscopic properties of the asphalt-aggregate interface incorporating different core materials.The results implied that the release of the core material accelerated the self-diffusion of asphalts,improved the self-healing efficiency of micro-cracks,and the self-healing efficiency increased with temperature.Due to the release of core materials,the cohesion energy and adhesion energy of aged asphalts increased by more than 37.2%and 36.8%,and the adhesion strength of the interface was also improved.Furthermore,compared with petroleum-based regenerant,vegetable oil could be better in promoting micro-cracks healing.Molecular dynamics could be utilized in deeply exploring the self-healing mechanism of microcapsule asphalt pavement,and providing a feasible method for the design and selection of microcapsule core materials.
作者
汤文
旷强
张宇翔
吕悦晶
TANG Wen;KUANG Qiang;ZHANG Yuxiang;LYU Yuejing(College of Automobile and Traffic Engineering,Wuhan University of Science and Technology,Wuhan 430065,China)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2024年第4期254-260,共7页
Materials Reports
基金
国家自然科学基金(51508428)
青海省重点研发与转化计划项目(2021-QY-207)
青海省交通运输厅科技项目(2022-01)。
关键词
沥青混合料
微胶囊
自愈合
分子动力学
粘聚能
粘附能
粘附强度
asphalt mixture
microcapsules
self-healing
molecular dynamics
cohesion energy
adhesion energy
adhesion strength
