Analysis of Load-Type Crack Formation Mechanism of Semi-Rigid Based Asphalt Pavement

摘要

This article investigates the load-type crack formation mechanism of semi-rigid based asphalt pavement. The XYJ-2 concrete strain sensors are used to detect the strain field created by standard loads acting on the pavement structure. The ultimate bending tensile strains of the materials are tested through indoor experiments. Cracking positions are pre-estimated using strain level. The results show the existence of pressure, weak-pull and strong-pull areas in the pavement structure. Original cracking points appear at the bottom of the base and the subbase courses where the strain levels are high. The fundamental cause of load-type cracks in semi-rigid based asphalt pavement is that the structure of the semi-rigid based asphalt pavement does not match the distribution of the strain field in the pavement structure.