A coupled hydraulic-mechanical-chemical peridynamic model for simulating corrosion-induced failure of unsaturated reinforced concrete under hydraulic pressure

Underwater reinforced concrete is vulnerable to chloride corrosion, which reduces the durability of underwater concrete structures. In this paper, by introducing time-varying chloride ion diffusion and non-uniform corrosion expansion failure model, a chemical-hydraulic-mechanical coupling peridynamic model of reinforced concrete corrosion expansion failure process in actual underwater environment is established. The proposed model focuses both on the unsaturated transport process of water and chloride and the corrosion failure of unsaturated reinforced concrete under water pressure. The validity of proposed model is firstly verified by comparing with experimental results and theoretical solutions. Then, the whole process of corrosion expansion failure of underwater reinforced concrete is simulated by using this model. The numerical results show that the developed chemical-hydraulic-mechanical coupling peridynamic model can simulate the penetration of water and chloride in unsaturated concrete and the failure process of concrete caused by chloride corrosion under water pressure. Furthermore, the effects of water pressure on water / chloride ion transport and corrosion expansion damage of underwater reinforced concrete were studied.