STUDY ON CRACK EXTENSION OF THE AC LAYER OF CRC+AC COMPOSITE PAVEMENT
Keywords: road engineering, continuously reinforced concrete composite pavement, load-type crack, temperature-type crack, crack extension
AbstractFocusing on the characteristics of structures of the CRC+AC composite pavement as well as the insufficient studies, the crack generation and extension mechanisms of the AC layer are studied by applying the fracture mechanics theory and finite element method. In addition to the above, the tip stress intensity factor of the load-type crack and temperature-type crack of the AC layer is calculated, the influence of the crack extension period, crack length, structural layer thickness, modulus, and other factors to the crack extension of the AC layer are analyzed and studied. And, the study results show that: the extension period of cracks of the AC layer has some impacts on the crack extension strength. the increased thickness of the AC layer can well delay the crack expansion of the AC layer, the impact of the thickness of the CRC layer on the crack extension of the AC layer is minor or none fundamentally, The extension strength of the temperature-type crack of the AC layer will linearly increase along with the increased modulus of the AC layer, and the change of the load-type crack is minor, and the impact of the modulus of other structural layers on the crack extension strength of the AC layer is very minor. And, the study results can be made as the reference basis of the rational design of the CRC+AC composite pavement.
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