Research on Moisture Susceptibility of Asphalt Mixture Based on Surface Energy Theory

摘要

According to surface energy theory and adhesion-peeling model, Wilhelmy plate method and sessile drop method are respectively used to test the surface free energy parameters of asphalt and aggregates so that adhesion work and peeling work can be calculated. ER is an evaluation product based on adhesion work and peeling work, which can reflect the moisture susceptibility of asphalt mixture because of its good correlation with macroscopic index. The higher ER is, the better the mixture performs. Results show that short-term aging, contrary to long-term aging, improves the moisture susceptibility of asphalt mixture; soaking will decrease the anti-stripping ability; freezing has no effect on moisture susceptibility, but additional high temperature thawing process will reduce the resistance to water damage. Anti-stripping ability of asphalt mixture is improved with the increasing of surface roughness; an increase in surface water and clay content is detrimental to moisture susceptibility.