Abstract:Semi-rigid base asphalt pavement is widely used in China due to its excellent bearing capacity. However, its own shrinkage characteristics are prone to cause cracks in the pavement during maintenance and use. Under the coupled action of traffic load and temperature, the cracks reflect and expand until penetrating the asphalt surface layer, forming a typical disease of reflective cracks, which seriously affects the service life and traffic capacity of the pavement. Based on the universal research on reflective cracks in semi-rigid bases at home and abroad, the generation mechanism of cracks under the action of traffic load and temperature is systematically sorted out, the influences of temperature and load magnitude on the stress intensity factor as well as the crack propagation law are summarized, and the effects of design parameters such as surface layer thickness and modulus, and base layer modulus on crack propagation are analyzed. The prevention and control measures are proposed from two aspects of material properties and structural optimization, such as setting stress absorption layers and laying geogrids, so as to provide a reference for subsequent research.
