修复混凝土内部钢筋纵向腐蚀行为研究  

Study on longitudinal corrosion behavior of internal reinforcement in repaired concrete

作　　者：王斌[1] 于金山[2] 李天 陈洁静 郝春艳[2] 金伟良[3] 夏晋 WANG Bin;YU Jinshan;LI Tian;CHEN Jiejing;HAO Chunyan;JIN Weiliang;XIA Jin(State Grid Tianjin Electric Power Company,Tianjin 300010,China;State Grid Tianjin Electric Power Research Institute,Tianjin 300384,China;College of Civil Engineering and Architecture,Zhejiang University,Hangzhou 310058,China;State Key Laboratory for Health and Safety of Bridge Structures,Wuhan 430034,China)

机构地区：[1]国网天津市电力公司,天津300010 [2]国网天津市电力公司电力科学研究院,天津300384 [3]浙江大学建筑工程学院,浙江杭州310058 [4]桥梁结构健康与安全国家重点实验室,湖北武汉430034

出　　处：《西安建筑科技大学学报（自然科学版）》2023年第4期520-527,共8页Journal of Xi'an University of Architecture & Technology(Natural Science Edition)

基　　金：国网天津市电力公司科技基金项目(KJ21-1-12)。

摘　　要：氯离子侵蚀下修复混凝土内部钢筋易再次发生微、宏电池腐蚀.为探究混凝土修复后钢筋纵向腐蚀特征,本文构建了物质传输-腐蚀区域动态界定-钢筋电化学腐蚀多场耦合模型.通过现有文献中的数据证明了基于塔菲尔斜率的腐蚀区域动态界定方法的有效性,利用模型对修复混凝土中沿钢筋纵向微、宏电池的腐蚀机理以及腐蚀的非均匀分布特征进行了研究,同时讨论了不同修复区长度与混凝土初始状态下的修复效果.结果表明,修复混凝土内部钢筋腐蚀出现在靠近修复界面的旧混凝土区中,修复界面存在明显的阳极环效应;修复前旧混凝土区内的氯离子浓度增加会显著提高腐蚀速率;随着旧混凝土修复区长度增大,钢筋腐蚀速率加快.The micro-cell and macro-cell corrosion is prone to re-occurrence on the steel bar in the repaired concrete under the chloride ion erosion.To explore the longitudinal corrosion characteristics of steel bars after concrete repair,a multi field coupling model of material transfer,dynamic definition of corrosion area and electrochemical corrosion was constructed.According to the test data in the existing literature,the feasibility of defining the dynamic corrosion area based on Tafel slope was verified.In addition,the longitudinal micro and macro cell corrosion mechanism and the non-uniform corrosion distribution characteristics of the internal reinforcement in repaired concrete were analyzed through the constructed model.Besides,the repair effects under different length of repair area and initial state of concrete were discussed.The results show that the reinforcement corrosion in the repaired concrete occurs in the old concrete area near the repaired interface,and there is obvious anodic ring effect at the repaired interface.The increase of chloride concentration in the old concrete area before patch repair will significantly increase the corrosion rate.Additionally,the corrosion rate of the reinforcement increases with the increase of length of the old concrete repair area.

关 键 词：氯离子 修复混凝土 钢筋腐蚀 微宏电池腐蚀 

分 类 号：TU373[建筑科学—结构工程]