关键词: 钢筋混凝土, 盐雾干湿循环, 腐蚀劣化, Weibull分布函数

Abstract: In view of the serious issue of reinforced concrete deterioration under the atmospheric environment of the western region, the corrosion characteristics of reinforced concrete under salt spray dry-wet accelerating corrosion experiment were investigated by electrochemical and concrete damage degree tests. Based on Weibull distribution function, the deterioration model of reinforced concrete in salt spray environment was established, and the competitive failure analysis was carried out. The results showed that under the environment of salt spray dry-wet cycles, both the protective layer of reinforced concrete and the internal reinforcement exhibit a trend of initial strengtheningand then following subsequent deterioration in corrosion resistance. Weibull distribution function can effectively describe the deterioration process of reinforced concrete under salt spray dry-wet environment. In the early stage of salt spray dry-wet cycles, the damage degree of concrete is more sensitive than the corrosion current density, while in the later stage, the corrosion current density becomes the dominant factor for the deterioration of reinforced concrete.

Key words: reinforced concrete, salt spray dry-wet cycles, corrosion deterioration, Weibull distribution functions