Fracture Behaviors of an Old CCP Structure under Impact Rolling Load

In view of the use of the impact compaction technology in old cement concrete pavement (CCP) reconstruction, ANSYS was used to establish the 3D finite element model (FEM). We combined the actual engineering pavement bending deflection detection and description of the inhibitory effect of reflection cracks in asphalt concrete to describe the reliability of impact compaction technology. The results showed that with the increased number of impact rolling times, lateral cracks appeared first at the lateral boundary of the slab and the bottom of the middle of the slab; then the cracks extended to the top and extended laterally and throughout whole slab finally. With the increase of impact and rolling times, longitudinal cracks appeared first at the top of the longitudinal boundary of the slab, increased with the extension of central lateral cracks in the middle, staggered formed map cracks with lateral cracks, which could be used to inhibit the production of load-type and temperature-type reflection cracks of asphalt concrete overlay. After impact and rolling, the deflection of the test section increased, and the ratio of deflection was 61.2%~94.3%.