混凝土中钢筋锈蚀研究现状与热点问题分析-硅酸盐学报.pdf

第38 卷第9 期 硅 酸 盐 学 报 Vol. 38 ，No. 9 2 0 1 0 年 9 月 JOURNAL OF THE CHINESE CERAMIC SOCIETY September，2010 混凝土中钢筋锈蚀研究现状与热点问题分析 施锦杰，孙 伟 (东南大学材料科学与工程学院，江苏省土木工程材料重点实验室，南京 211189) 摘 要：在恶劣环境条件下，混凝土结构中钢筋的锈蚀问题已成为腐蚀领域和土木工程材料领域共同关注的话题。引起混凝土中钢筋钝化膜破坏进而 诱发锈蚀的机理尚未明确，且影响钢筋锈蚀发展的因素复杂多变，最终导致了钢筋混凝土结构过早失效，严重影响了钢筋混凝土结构的服役寿命。首 先，评述了导致钢筋锈蚀的3 大原因(氯离子侵蚀、碳化作用与杂散电流) ；其次，阐述了影响钢筋锈蚀发展的重要因素(相对湿度、氧气扩散与温度等) ； 最后，依据研究现状着重分析了钢筋锈蚀研究中出现的氯离子临界值，钢筋–混凝土界面区，开裂–锈蚀交互作用等热点问题。对今后钢筋锈蚀的研究 重点进行了展望。 关键词：混凝土；钢筋锈蚀；氯离子临界值；钢筋–混凝土界面区；开裂–锈蚀交互作用 中图分类号：TU528 文献标志码：A 文章编号: 0454–5648(2010)09–1753–12 RECENT RESEARCH ON STEEL CORROSION IN CONCRETE SHI Jinjie ，SUN Wei (College of Materials Science and Engineering, Jiangsu Key Laboratory of Construction Materials, Southeast University, Nanjing 211189, China) Abstract: The problem of steel corrosion in concrete structures in severe environment has been an interesting aspect in fields of cor- rosion and civil engineering materials. The mechanism of corrosion in concrete induced by the steel depassivation is still unclear so far. Moreover, corrosion propagation of steel is affected by numerous factors, which ultimately leads to the premature failure of rein- forced concrete structures and the reduction of service life. Three main reasons (chloride ions, carbonation and stray current) causing the steel corrosion are reviewed. Some important factors (relative humidity, oxygen diffusion and temperature, etc), which influence the development of steel corrosion process, are represented. The results of recent studies in steel corrosion, such as chloride threshold level, steel–concrete interface and crack–corrosion interacti