Study on the Development Law of Transverse Cracks in Asphalt Pavement with Semi-Rigid Base

To study the development law of transverse cracks, the multi-years crack detection data in Jiangsu provincial expressway were analyzed, and the crack number and length were observed over a long-term for a typical section. Considering influence factors such as environment and pavement materials, the development law of transverse crack density with road age was analyzed, and the model was established to carry out prediction analysis using the structural behavioral equation. The results show that the generation and expansion of transverse cracks are greatly affected by low temperature. Compared with AK-13 or PAC-13, the crack density is smaller when SMA-13 is used as the surface layer material. The development law of transverse cracks presents three-stage characteristics of initial development, steady development, and rapid development, which can be characterized by structural behavior equations. When the pavement is maintained over time, the cracks develop slowly, and the equation parameter of β is small.