Reflective Cracking Of Lean Concrete Base Asphalt Pavement Structure

Reflective cracking is one of the major modes of distresses in lean concrete-asphalt overlays composite pavement. Cracks of asphalt pavements start as microcracks and later propagate, cracks increased, and coalesced due to repeated traffic loading or low temperature thermal stresses or combinations of both to form cracks, and result in structural distresses of asphalt pavements. Researching on initiation mechanism and propagation behavior of cracks and comprehending the state of the stress field and crack propagation path in asphalt pavements is necessary for a sound evaluation of mechanistic behavior of pavements. There are very important to enhance the resistance cracking performance of asphalt pavement structure, to select optimum asphalt mixtures and to improve the present design methods.Firstly, based on literature review of a large number of relevant domestic and international research findings, the article analyzed the mechanism of premature distresses and identification of cracks in asphalt pavements were investigated and summarized in detail. The article analyzed the simulation crack propagation behavior of asphalt concrete in lean concrete-asphalt overlays composite pavement and the crack propagation undue low temperature thermal by program. The article forecasted and compared the fatigue life of different road structure. The article computed the stress state which coursed by traffic loading or low temperature thermal by changing the thickness and modulus of structure lay. This also calculated traffic loading and low temperature thermal at the same time. The article analyzed the influence of every factor to the stress centralized under the asphalt layer which has stress absorbing layers. Finally, the article some composite structure of lean...