Study on Fracture Characteristics of Asphalt Pavement with Longitudinal and Transverse Cracks under the Influence of Real Temperature Field

Abstract

In order to study the influence of the actual temperature field of asphalt pavement on the fracture characteristics of asphalt pavement structure, the finite element(FE) software ABAQUS is used to simulate the temperature field of asphalt pavement in summer and winter, and then the temperature field corresponding to specific time period is introduced into the thermal mechanical coupling analysis. The effects of different loading speeds (10, 20 m/s) and different loads sizes (0.7, 1.2 MPa) on the stress intensity factors (SIF) of top-down (longitudinal) and base reflective (transverse) cracks were studied, and the crack propagation characteristics were discussed. It is found that in summer, the top-down cracks in the surface layer mainly propagate in mode II, and the value increases with the increase of load. In winter, the low temperature promotes the propagation of mode I crack, and the sign of K? value in winter is opposite to that in summer. For the reflection crack of base course, the coupled field promotes the propagation of mode II crack at high temperature in summer. However, in winter, the base is prone to mode I expansion, and increases with the increase of load. When there is no coupling field, the speed has little effect on crack propagation, but the location of SIF peak value changes in time. In the coupled field, the SIF value increases with the decrease of speed. Therefore, considering the real temperature field, heavy load and slow speed have the greater damage to the pavement.