Drained Shear Response of Cement-Stabilized Recycled Asphalt Pavement–Lateritic Soil Blends

In this paper, the drained shear behavior of cement-stabilized recycled asphalt pavement (RAP)–lateritic soil blends is presented. The marginal lateritic soil was replaced by RAP to reduce the fine content and then stabilized by Portland cement for ground improvement and pavement applications. The effect of cement content and RAP content on the shear behavior of RAP–soil samples was evaluated through a series of drained triaxial test. The result indicated that RAP replacement ratio, cement content, and effective stress significantly affected the drained shear of RAP–soil samples. The shear strength increased with cement content and RAP content. However, the excessive RAP replacement ratio results in the reduction of peak shear strength. The brittle to ductile transition was found when effective confining pressure increased. RAP replacement increased the maximum volumetric compression and the dilatation rate of the blends as the inclusion of compressible asphalt binder increased the ductility of RAP–soil samples. The stress–dilatancy behavior of RAP–soil samples was similar to that of medium to dense soil. The stress ratio and dilation significantly depended on RAP replacement ratio, and cement content. The dilation was suppressed when effective confining pressure increased. Row’s stress dilatancy equation can model the stress–dilatancy behavior of unstabilized and stabilized RAP–soil samples.