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The aged asphalt film transfer between new and old aggregate during hot in-place recycling of asphalt pavement was investigated in this paper. The mechanism of asphalt film transfer between new and old mixture was analyzed by connective mass transfer theory. Based on the theoretical analysis, influence factors for asphalt film transfer during hot in-place recycling were summarized. Then laboratory tests simulating the file hot in-place recycling process were conducted to investigated the asphalt film transfer between new and old aggregate based on different influence factors design. The test results indicated that preheating temperature, mixing time and recycling agent are the key influence factors during hot in-place recycling process. Suggestions to guarantee the quality of hot in-place recycling asphalt mixture were given in this paper.

The equivalent axle-number coefficient for asphalt pavement with rigid base was investigated in this paper. Based on the elastic-layer system theory and fatigue tensile-stress principles, the relationship between axle-number coefficient for asphalt pavement with rigid base and tensile stress under rigid base was obtained. The influences on the axle-number coefficient by different structural parameters such as thickness and modulus of different pavement layers were analyzed by finite element program. And then the calculation formula for axlenumber coefficient of asphalt pavement with rigid base was suggested and compared with the axle-number coefficient suggested by AASHTO. It is indicated that the calculation formula for axle-number coefficient suggested in this paper is reasonable.