知识与财富的链接
针对西部地区大气环境下钢筋混凝土病害严重问题,模拟当地腐蚀环境,设计盐雾与烘干相结合的室内加速腐蚀试验,采用电化学参数和混凝土损伤度表征钢筋混凝土的腐蚀劣化规律;基于Weibull分布函数建立钢筋混凝土在盐雾环境下的劣化模型,并进行竞争失效分析.结果表明:在盐雾干湿循环作用下,钢筋混凝土保护层及内部钢筋的耐腐蚀性均呈现出先强化后劣化的变化趋势;Weibull 分布函数可以有效地描述钢筋混凝土在盐雾环境下的性能劣化过程;在盐雾干湿循环前期,混凝土损伤度比腐蚀电流密度更为敏感,而在后期,腐蚀电流密度为钢筋混凝土劣化的主导因素.
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.
