Study on Self-healing Behavior of Polyurethane Modified Bitumen Based on Molecular Dynamics
The self-healing model of matrix asphalt and PU modified asphalt was established by molecu-lar dynamics method.The self-healing behavior of PU modified asphalt was studied by density,ener-gy,temperature and Z-axis concentration curves.The influence of PU on asphalt self-healing was ana-lyzed by diffusion coefficient,free volume fraction and hydrogen bond.The results show that the self-healing behavior of PU modified asphalt can be divided into four stages:energy acquisition,flow dif-fusion,self-healing and molecular balance.When the temperature is the same,PU can promote the self-healing of asphalt.Meanwhile,the formation of hydrogen bonds between PU and asphalt mole-cules makes the model with the end of healing stronger.
万方数据
维普
