关键词: 道路工程, 黏弹性, 微观力学, 沥青混合料, 逾渗理论, 增强系数, 静态蠕变试验

Abstract:

he viscoelasticity of the asphalt mixture was predicted by micromechanics and percolation theory. The asphalt mixture was regarded as the composite consisting of the coarse aggregate as the rigid inclusion and the mixture of the fine aggregate, filler and binder as the viscoelastic matrix. A model to predict the viscoelasticity of the asphalt mixture from that of the fine aggregatefillerbinder matrix(AFBM) was deduced in Laplace domain using the Mori-Tanaka equivalent inclusion theory and the macroscopic average theory. The parameters in the prediction model were modified based on the percolation theory, and the predicted results were compared with the ones measured by the static creep test. The results show the coarse aggregate enhances the viscoelastic performance of the fine AFBM. The viscoelastic constitutive relation of the asphalt mixture can be expressed as the product of an enhancement coefficient(EC) and the viscoelastic relation of the fine AFBM. The micromechanics predicted ECs appear smaller than the ones measured by the creep test because the prediction accuracy of the Mori-Tanaka method decreases with the increase of the coarse aggregate volumatric fraction. The ECs modified by the percolation theory agree better with the measured results.

Key words: road engineering, viscoelasticity, micromechanics, asphalt mixture, percolation theory, enhancement coefficient (EC), static creep test