Abstract
This research aims to identify the influence of damage generated by high pressure water on concrete fracture performance under three-point bending. The range of applied water pressure was 0–4 MPa. According to the findings, high pressure water damage significantly influences the concrete fracture performance, resulting in a faster failure process, poorer bearing capacity, and higher cracking susceptibility. The damage caused by high pressure water is quantified by the deterioration degree of elastic modulus, and the relationship between peak load, crack length, and water pressure is established. The double-K fracture criterion determines the fracture characteristics of concrete damaged by high pressure water. Cohesive fracture toughness and unstable fracture toughness could decrease with increased water pressure, while initiation fracture toughness would not be significantly affected. This paper presents the empirical formula for the fracture parameters and modifies the double-K fracture model of concrete exposed to high pressure water.
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