Interlaminar Mechanical Properties of Cement Concrete Pavement Structures with Isolation Layer

To reduce the reflection cracking and interlayer bonding degree of cement concrete pavement, an isolation layer was set up between the water-stabilized base layer and the cement surface layer. Finite-element analysis was used to analyze the mechanical properties of the cement concrete pavement structure and the wax isolation layer. By changing the cohesive strength and internal friction angle of interlaminar structures, the effects of different friction coefficients on the pavement deflection, the maximum tensile stress of surface course, the maximum interlaminar shear stress, and the maximum tensile stress of base course were analyzed. Results showed that when the internal friction angle was 0 degrees, the maximum tensile stress of surface course of cement concrete in the upper warpage state was 4.6 times of that in the lower warpage state; the change of internal friction angle had more influence on the concrete stress than did the change of cohesive force; and the internal friction angle needs to be controlled at 30 degrees to 50 degrees when the cohesion is less than 0.01 MPa. The mechanical property parameters of cement concrete pavement were obtained, which could provide a scientific basis for the pavement structure design with wax isolation layer.