关键词: 水利工程；钢筋混凝土；混凝土接缝；钢筋锈蚀；试验研究；数值模拟

Abstract: Focusing on the joint area of concrete anti-scour walls — a critical weak zone under chloride erosion environment, the corrosion characteristics and evolution patterns of steel reinforcement in the joint region were systematically investigated through combined experimental and numerical simulation approaches. Concrete joint specimens were designed and fabricated, and immersion and accelerated electrified corrosion methods were employed to measure electrochemical parameters such as corrosion potential and corrosion current density. The influence of chloride concentration and interface cracking on reinforcement corrosion was focused and explored, and numerical simulation was conducted to analyze the chloride diffusion behavior in the joint zone. The research results indicate that the risk of reinforcement corrosion in the joint area is significant. Chloride ions penetrate laterally along the joint interface and subsequently propagate longitudinally along the steel-concrete interface, forming a “lateral penetration-longitudinal propagation” dual-pathway erosion pattern. Increasing the chloride concentration from 5% to 10% leads to an average increase of 17% in the corrosion current density of reinforcement in the joint zone. The 0.2 mm interface crack not only advances the corrosion time of reinforcement corrosion but also increases the current density by 36%, and there is a significant two-dimensional diffusion effect of chloride ions in the crack area. The research results provide a quantitative basis for the durability design and maintenance of the joint area of concrete anti-scour walls.

Key words: hydraulic engineering; reinforced concrete; concrete joints; reinforcement corrosion; experimental study; numerical simulation