Calculation and Analysis of Shear Stress Asphalt Mixture Based on X-ray CT Technology and Finite Element Method

Abstract

In order to calculate and analyze shear stress of asphalt mixture based on three-dimensional microscale, three dimensional numerical model consistent with the actual spatial distribution of mixture was established by using core images of nano-CT scanning and Simpleware image processing software combined with finite element method, aggregate, mortar and void were given corresponding material parameters considering the change of temperature, and the maximum shear stress value were calculated. The results show that the shear stress distribution is not uniform within the three-dimensional numerical samples, most of the shear stress borne by the aggregate; the maximum shear stress value increases with the increase of temperature, which indicates that shear failure occurs more easily under high temperature conditions, and the rationality of the calculation results was verified by the macro-shear strength determination of mixture.