Fracture properties of hybrid fiber reinforced cement-based composites

Abstract

In this paper, the effects of base material strength (4 water-binder ratios) and BF volume content on the fracture performance of composite materials were adopted, and the fracture performance parameters of PVA/BF-ECC were measured by monitoring the damage and failure process of composite materials in the stress process by acoustic emission technology. Through the test results, the mechanism of hybrid fiber restraining crack generation and restraining crack development is qualitatively analyzed. The results show that hybrid BF improves the initial fracture toughness of composites; When hybrid based on synergistic effect, although hybrid BF will greatly reduce the unstable fracture toughness, the composite can still maintain high unstable fracture toughness after replacing PVA fiber with 0.5vol%BF, the fracture toughness of the composite under four kinds of substrate strength is 13.68MPa∙m1/2, 14.38MPa∙m1/2, 12.12MPa∙m1/2and 12.20MPa∙m1/2, which is more than 20 times that of ordinary concrete.