Mechanical properties of interface between coarse-grained soil and concrete

Comparative tests on interfaces between different materials are performed by means of the self-developed NHRI-4000 high-performance large interface shear apparatus. Change of mechanical properties of interfaces between different coarse-grained soils and concrete is investigated owing to the differences of materials. The influences of the existence of slurry on the strength indices of the interfaces are analyzed. The test results show that shear failures all occur in the contact zone of specimens. The properties of materials and the differences of particle shapes have great influences on the strength and deformation characteristics of interfaces as well as the residual shape of shear plane after shearing. The specific exhibition is as follows: (1) the strength and deformation indices of rock-fill materials with distinct edges are significantly superior to those of sand-gravel materials with good roundness; (2) the existence of slurry leads to obvious decrease of mechanical indices of the interfaces.