Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : September 13, 2020 - September 16, 2020
Strength of concrete which is composed of cement paste and aggregates is lower than that of cement paste only because of the formation of a porous layer, called the interfacial transition zone, around the interface between the aggregates and cement. In this study, the strength degradation by aggregates was analyzed by using small glass spheres with a uniform diameter as a simplified aggregate to focus on the effects of interfacial transition zone. The compressive test was conducted using the specimens of plain cement paste and cement paste with glass spheres. The strain distribution on the surface of each specimen was obtained by 3D digital image correlation method to investigate the effect of the inclusion of the glass sphere. The strain distribution on the surface of the specimen revealed that the crack initiation is based on the maximum principal strain in both plain cement paste and cement paste with glass spheres, but the interfacial transition zone accelerates the crack propagation until fracture.
