Researches On Thermal Expansion Coefficient Of Asphalt Mixture Based On Micromechanics

As is known to all, asphalt pavement has many advantages, such as smoothness,wear-resistance, low noise, short construction period and so on. Therefore it is widely used in high-grade road. With the rapid development of economy, traffic volume and vehicle capacity keep increasing. That brings about diseases of asphalt pavement such as rutting. In addition, global warming and climate instability also speed up the damage of the asphalt.This series of change influence the safety of road. Therefore, to ensure road traffic safety,the research on mechanical and thermal properties of asphalt mixture is particularly important.Based on classical mesomechanical theory, combined with elastic-viscoelastic correspondence principle, firstly it analyzes and contrasts Eshelby equivalent inclusion method, self-consistent method and generalized self-consistent method, then shows the good and bad of them in the prediction of effective mechanical and thermal properties of asphalt mixture. Then considering the universality of two-phase composite material and the uniqueness of asphalt mixture, it figures out the pre-estimation method of equivalent thermal expansion coefficient of asphalt mixture, and compares it with the pre-estimation method of classic two-phase composite material thermal expansion coefficient and analysis of micro-mechanics FEM. Result shows that the equivalent thermal expansion coefficient of asphalt mixture is largely related to its inclusion percentage. It decreases with the increase of volume fraction of the inclusion. In addition, its equivalent thermal expansion coefficient also has a close relation with the bonding degree between matrix and inclusions,namely, interfacial effect.