Abstract: Research on the mechanical properties of cemented sand and gravel (CSG) materials has been increasing along with the application of CSG Dam. In order to improve the mechanical properties such as strength and deformation rate of CSG materials, we added fibers into natural sand and gravels with identical aggregate gradation and sand ratio, and investigated into the mix proportion by adjusting cement content and age through orthogonal experimental design. According to tests and regression equation, we conclude that the dosage of PVC-fiber effectively improved the ductility of CSG material, and converted the brittle fracture of CSG specimens into ductile fracture. In particular, the compression and split strength of specimens reached the maximum when PVC fiber proportion was 3%.

Key words: cemented sand and gravel, PVC-fiber, compressive strength, influential factors, mechanical properties