The Research Of The Interlayer Between The Thin Asphalt Overlay And Old Portland Cement Concrete Pavement

The thin Asphalt concrete overlay(ACO) are used widely in the reconstruction engineering of Old Portland Cement Concrete Pavement (OPCCP) for its good evenness, comfortable to drive, easy and quick to construct, at the same time , It can prolong the life of the road . Because the old concrete pavement can't bear shearing stress and tensile stress at joint or crack, On which asphalt overlay is liable to damage and induce reflection crack by cyclic temperature stress and wheel loads. With the time going the reflective cracking keep on expanding for cyclic traffic and environment loads. So roughness and pavement performance are reduced.The paper studies mainly on four aspects: (1) The anti-cracking 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, thermal stress, and coupled stress in ACO structures are emphatically analyzed, considering the ACO with geosynthetics, stress absorption layer. (2) By pavement performance's tests of the asphalt mixtures, water stability, stable in high temperature, cracking-resistance in low temperature.(3)The strength of interlayer between ACO and OPCCP is studied, as well as how to improve it.(4) Research the construction procedures of different interlayers.