开裂混凝土中碳钢与不锈钢钢筋腐蚀速率研究  

Corrosion rates of carbon steel and stainless steel reinforcements in cracked concrete

作　　者：王海龙[1] 俞宁 吴远建 徐洪权 孙晓燕[1] WANG Hailong;YU Ning;WU Yuanjian;XU Hongquan;SUN Xiaoyan(College of Civil Engineering and Architecture,Zhejiang University,Hangzhou 310058,China;China Railway Design Corporation,Tianjin 300308,China)

机构地区：[1]浙江大学建筑工程学院,杭州310058 [2]中国铁路设计集团有限公司,天津300308

出　　处：《水力发电学报》2022年第9期129-138,共10页Journal of Hydroelectric Engineering

基　　金：中国铁路上海局集团公司科研计划项目(2022000);国家自然科学基金项目(51879229;51579220)。

摘　　要：为了揭示裂缝宽度对混凝土中碳素钢与不锈钢钢筋锈蚀速率的影响,本文在钢筋腐蚀电化学理论的基础上,考虑裂缝对混凝土中氯离子和氧气输运的影响、氧气对钢筋锈蚀的作用,建立开裂混凝土数值模型探究了钢筋的腐蚀过程。通过与试验结果的对比分析验证了数值模型的正确性,并以此为基础开展了参数敏感性分析。研究结果表明:阳极极化过程和氧气供给是影响钢筋腐蚀速率的两大制约因素,裂缝除了能够提前钢筋由钝态转化为腐蚀态的时刻,也会对碳钢腐蚀稳定后的腐蚀速率大小产生影响,减小裂缝宽度和氯离子扩散系数能有效限制钢筋的腐蚀速率。与碳素钢筋相比,即使在更恶劣的侵蚀条件下不锈钢钢筋仍表现出了更好的耐蚀性能。Based on the electrochemical theory,numerical models are developed to reveal the effect of crack width on the corrosion rate of carbon steel and stainless steel reinforcements in concrete,considering the effect of cracks on chloride ion and oxygen transportation in concrete and the effect of oxygen on steel corrosion process.Experimental tests are conducted to verify the accuracy of numerical simulations,and the parameter sensitivity of the simulations is examined.The results show the anodic polarization process and oxygen supply are two dominating factors of the steel corrosion rate.The occurrence of cracks moves up the critical time for steel bars to transform from passive to corrosive,and also affects the corrosion rate of carbon steel in the stable corrosion stage.Reducing the crack width and chloride diffusion coefficient can significantly limit the steel corrosion rate.Compared with carbon steel,stainless steel shows higher corrosion resistance in harsh erosive environments.

关 键 词：混凝土裂缝宽度 钢筋锈蚀 腐蚀速率 不锈钢筋 数值模拟 

分 类 号：TU375[建筑科学—结构工程]