Study on Critical load position and Cracking in asphalt layer of Continuously Reinforced Concrete Composite Asphalt Pavement

This paper is mainly focused on the structure characteristics and the flaws of existing studies of CRC+AC composite pavement, mechanics theory and finite element method are applied to establish CRC+AC composite pavement finite element models based on crack pattern, the critical load position of CRC+AC composite pavement is found out under different crack spacing, and cracks on the AC layer extended mechanisms have been studied. The results show that: critical load position may appear in the horizontal cracks in the middle of the edge and vertical of the central free edge; in the long-term effect of traffic load, AC layer surface because of traffic loads, temperature effects, quality of construction, materials, aging and other factors produce longitudinal and transverse cracking. CRC layer transverse cracks in the bottom layers of the corresponding region AC will also have cracks, and finally forms reflective crack on the AC layer surface. The results can provide a basis for rational design of CRC+AC composite pavement.