摘要
沥青砂浆是沥青混合料的重要组成部分之一,其界面行为严重影响着沥青混合料的使用性能。基于分子动力学理论研究,建立沥青砂浆界面模型,分析沥青砂浆界面上沥青的扩散、迁移及结构变化情况,并计算其界面能,分析其界面结合情况。结果表明:高温将导致砂浆界面沥青分子扩散加剧,二面角变小,蜷曲程度变大,沥青分子支链的变化最大,并严重影响沥青砂浆界面粘附性。
Asphalt mortar is one of the important components of asphalt mixtures. The interface behavior of asphalt mortar seriously affects the performance of asphalt mixture. Asphalt mortar interface model was constructed and based on molecular dynamics theory. The diffusion, migration and structural changes were studied and the interface bonding strength was analyzed. Results showed that the high temperature would lead to increase the diffusion coefficient of as- phalt, the degree of curled up of asphalt and decrease the dihedral angle. Meanwhile, with the increase of the tempera- ture, the molecular branched chains of asphalt and the interface adhesion of asphalt mortar changed greatly.
出处
《建材世界》
2015年第3期65-67,共3页
The World of Building Materials
关键词
沥青砂浆
界面行为
分子动力学
扩散
asphalt mortar
interface behavior
molecular dynamics theory
diffusion
