The 4th Asian Concrete Federation Symposium on Emerging Technologies for Structural Longevity (ACF2023- ETSL)

69 / 2022-04-12 14:50:09

Numerical simulation of the effect of crack dynamic self-healing process on chloride ion transport and reinforcement corrosion in concrete

Self-healing of cracks, Chloride ion transport, Steel corrosion, Electrochemical dichlorination, Numerical simulation

Concrete cracks have the characteristics of self-healing. Studying the effects of crack self-healing on chloride ion transmission, reinforcement corrosion and electrochemical chlorine removal has engineering value and significance for studying and improving the service life of reinforced concrete structures. Based on the finite element software COMSOL multiphysics, this paper simulates the dynamic process of crack self-healing from the perspective of chloride ion "entering and discharging" concrete, and reveals the influence of crack self-healing on chloride ion concentration distribution, reinforcement corrosion and chloride ion distribution in the process of electrochemical dechlorination. The results show that the chloride concentration in concrete with crack self-healing is gradually lower than that without crack self-healing; The self-healing of transverse cracks will not only reduce the corrosion rate and the surface potential of reinforcement, but also reduce the diffusion rate of chloride ions in concrete; The effect of single crack with different self-healing rate on electrochemical chlorine removal is not obvious.