Study on the Effect of Surface-Base Bond State on the Mechanical Response of Cement Concrete Pavement

To study the influence of the surface-base bond state on the mechanical response of cement concrete pavement, a pavement structure model was established, and the bond coefficients were set between the cement concrete surface and the poor cement concrete base for stress and strain analysis. The research results show that: (1) The horizontal tensile stress and shear stress at the bottom of the surface layer both significantly decreased with an increase in the surface-base bonding coefficient, whereas the horizontal tensile stress at the bottom of the base layer increased overall and the shear stress dropped. (2) After the surface-base bonding coefficient increases to 6.0, the stresses reach a steady state and the surface-base bonding state is nearly completely continuous. In the actual project, the concrete slab can be poured directly before the initial setting of the poor cement concrete base, so that the best combination between the surface-base can be achieved, thus prolonging the pavement’s service life.