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The Asphalt concrete overlay are used widely in the reconstruction engineering of Old Cement Concrete Pavement for its good evenness, comfortable to drive, easy and quick to construct, at the same time , It can prolong the life of the road .SMA is a special kind asphalt mixtures, the powdered ore and the textile fiber stabilizer makes the binding the jump grading bituminous mixture both has the gradation blend to inlay pushes the ability, sharpens the anti-wheel rut ability and the grip resistance, and has the dense gradation blend merit, the percentage of voids small, the asphalt amount used are many, enhances the fatigue life and the anti-water harm ability. Applications of SMA as the surface layer and interlay, can enhance the riding comfort, reduces and delays plant disease the production, lengthens the road surface service life.The paper studies mainly on five aspects: (1)After the assessment for structure characteristic of old cement concrete pavement (OPCCP),corresponding repair schemes or compile maintain plans are constituted.(2)This paper introduces several typical overlay design methods on and puts forward some problems which require more study.(3)The strength of interlayer between ACO and OPCCP is studied, as well as how to improve it. The mechanism of several new overlay types is analyzed, and the 3-D Finite Element Modeling (FEM) is used to analyze the ACO stress in response to different ACO modulus and thickness, and foundation modulus under traffic loading and thermal loading. The loading stress and thermal stress in ACO structures are emphatically analyzed, considering the ACO with geosynthetics, stress absorption layer. (4) By pavement performance’s tests of the asphalt mixtures, water stability, stable in high temperature, cracking-resistance in low temperature. (5) Research the construction procedures of different interlayer.The study indicates that SMA overlay is suitable to Jilin area.
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