Influence of coarse aggregate on the mechanical behavior of strain hardening cementitious composites

Abstract

Influences of coarse aggregate on the mechanical properties of Strain Hardening Cementitious Composite (SHCC) were experimentally investigated at the material and structural level. In the experiments, maximum size and volume fraction of coarse aggregate were varied as parameters. Direct uniaxial tensile tests and bending tests were carried out in order to evaluate the mechanical performance such as tensile strength and elongation capacity of SHCC itself. And also, bending-shear loading tests of steel reinforced SHCC (R/SHCC) beams were conducted. As the results, decreasing of tensile performances of SHCC in material level were observed by an increasing of the volume fraction of coarse aggregate. However, shear capacity of R/SHCC beam did not decrease. Both the tensile performance and the aggregate interlocking has effect on the mechanical behavior of R/SHCC beam failed in diagonal shear. It was suggested that these two mechanisms are the trade-off relation and the aggregate interlocking had significant effect on the shear capacity in this study.