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工程科学学报.第43卷.第6期:778-785.2021年6月 Chinese Journal of Engineering,Vol.43,No.6:778-785,June 2021 https://doi.org/10.13374/j.issn2095-9389.2020.04.01.004;http://cje.ustb.edu.cn 电化学修复后钢筋混凝土黏结性能演变规律 樊玮洁),吴云涛),毛江鸿)四,金伟良),陈锦森) 1)浙江大学宁波理工学院土木建筑工程学院,宁波3151002)浙江大学建筑工程学院.杭州310058 ☒通信作者,E-mail:jhmao@nit.zju.edu.cm 摘要针对电化学修复技术导致修复后结构内钢筋混凝土黏结性能退化问题,通过中心拉拔实验获取电化学修复后钢筋 混凝土黏结滑移曲线,研究电化学修复参数(电流密度和通电时间)对钢筋混凝土黏结性能的影响规律,通过实验结果进行模 型参数分析,建立基于电流密度和通电时间两个控制变量的黏结强度劣化模型.研究结果表明:电通量较小的情况下,钢筋 混凝土黏结性能损失较小;不控制通电参数的电化学修复技术导致黏结强度下降明显,采用5A2的电流开展28d的恒电 流通电,试件的最大黏结力损失量高达56.9%:本文提出的劣化模型可以定量表征电化学修复后试件黏结强度折减情况,模 型的数值模拟结果与本文及其他文献的实验结果均有较好的一致性,相关系数分别为0.9606和0.9745 关键词电化学修复:钢筋混凝土:黏结强度:电化学参数:折减模型 分类号TU375 Evolutionary regularity of bond property for reinforced concrete after electrochemical rehabilitation FAN Wei-jie,WU Yun-tao,MAO Jiang-hong,JIN Wei-liang?,CHEN Jin-sen 1)Ningbo Institute of Technology,Zhejiang University,Ningbo 315100,China 2)College of Civil Engineering and Architecture,Zhejiang University,Hangzhou 310058,China Corresponding author,E-mail:jhmao@nit.zju.edu.cn ABSTRACT Reinforcement corrosion,due to the presence of chloride ions,is a major cause of the degradation of reinforced concrete structures.Nowadays,electrochemical rehabilitation (ER)is becoming a common technique for repairing reinforced structures.Due to the transmission properties of the micro-pores in concrete,chloride ions can be transferred to the outside of the concrete through the pores under the driven force of electric field.Compared with other conventional technologies,ER presents many advantages,such as high efficiency and little influence on the environment and surroundings.However,previous studies indicate that ER exhibits negative effect on the interfacial bonding properties of steel concrete.As the main influence factor for ER,varying current densities may consequently change the bond loss between steel and concrete.In addition,large current density significantly reduces interfacial bond. However,current studies lack relevant quantitative research results and fail to propose an effective method to solve the problem after electrochemical repair since aiming at electrochemical rehabilitation will most likely result in the bond deterioration of reinforced concrete.In this study,the bond-slip curves were obtained through central pull-out specimens after ER with various electrochemical parameters,and the relationship between the electrochemical parameters(current density and conduction time)and the bond behaviors were investigated.Finally,a degradation model of bond strength considering the influences of the two parameters mentioned was established.Results show that the bond strength decreases significantly with high current density and long conduction time.Using a 收稿日期:2020-04-01 基金项目:国家自然科学基金重点资助项目(51638013):国家自然科学基金重点国际合作资助项目(51820105012):国家自然科学基金资 助项目(51878610):浙江省自然科学基金资助项目(LQ19E080012):宁波市自然科学基金资助项目(2018A610359)电化学修复后钢筋混凝土黏结性能演变规律 樊玮洁1),吴云涛1),毛江鸿1) 苣,金伟良2),陈锦森1) 1) 浙江大学宁波理工学院土木建筑工程学院,宁波 315100    2) 浙江大学建筑工程学院,杭州 310058 苣通信作者,E-mail:jhmao@nit.zju.edu.cn 摘    要    针对电化学修复技术导致修复后结构内钢筋混凝土黏结性能退化问题,通过中心拉拔实验获取电化学修复后钢筋 混凝土黏结滑移曲线,研究电化学修复参数(电流密度和通电时间)对钢筋混凝土黏结性能的影响规律,通过实验结果进行模 型参数分析,建立基于电流密度和通电时间两个控制变量的黏结强度劣化模型. 研究结果表明:电通量较小的情况下,钢筋 混凝土黏结性能损失较小;不控制通电参数的电化学修复技术导致黏结强度下降明显,采用 5 A·m–2 的电流开展 28 d 的恒电 流通电,试件的最大黏结力损失量高达 56.9%;本文提出的劣化模型可以定量表征电化学修复后试件黏结强度折减情况,模 型的数值模拟结果与本文及其他文献的实验结果均有较好的一致性,相关系数分别为 0.9606 和 0.9745. 关键词    电化学修复;钢筋混凝土;黏结强度;电化学参数;折减模型 分类号    TU375 Evolutionary regularity of bond property for reinforced concrete after electrochemical rehabilitation FAN Wei-jie1) ,WU Yun-tao1) ,MAO Jiang-hong1) 苣 ,JIN Wei-liang2) ,CHEN Jin-sen1) 1) Ningbo Institute of Technology, Zhejiang University, Ningbo 315100, China 2) College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China 苣 Corresponding author, E-mail: jhmao@nit.zju.edu.cn ABSTRACT    Reinforcement corrosion, due to the presence of chloride ions, is a major cause of the degradation of reinforced concrete structures. Nowadays, electrochemical rehabilitation (ER) is becoming a common technique for repairing reinforced structures. Due to the transmission properties of the micro-pores in concrete, chloride ions can be transferred to the outside of the concrete through the pores under the driven force of electric field. Compared with other conventional technologies, ER presents many advantages, such as high efficiency and little influence on the environment and surroundings. However, previous studies indicate that ER exhibits negative effect  on  the  interfacial  bonding  properties  of  steel  concrete.  As  the  main  influence  factor  for  ER,  varying  current  densities  may consequently change the bond loss between steel and concrete. In addition, large current density significantly reduces interfacial bond. However, current studies lack relevant quantitative research results and fail to propose an effective method to solve the problem after electrochemical  repair  since  aiming  at  electrochemical  rehabilitation  will  most  likely  result  in  the  bond  deterioration  of  reinforced concrete.  In  this  study,  the  bond-slip  curves  were  obtained  through  central  pull-out  specimens  after  ER  with  various  electrochemical parameters, and the relationship between the electrochemical parameters (current density and conduction time) and the bond behaviors were  investigated.  Finally,  a  degradation  model  of  bond  strength  considering  the  influences  of  the  two  parameters  mentioned  was established. Results show that the bond strength decreases significantly with high current density and long conduction time. Using a 收稿日期: 2020−04−01 基金项目: 国家自然科学基金重点资助项目(51638013);国家自然科学基金重点国际合作资助项目(51820105012);国家自然科学基金资 助项目(51878610);浙江省自然科学基金资助项目(LQ19E080012);宁波市自然科学基金资助项目(2018A610359) 工程科学学报,第 43 卷,第 6 期:778−785,2021 年 6 月 Chinese Journal of Engineering, Vol. 43, No. 6: 778−785, June 2021 https://doi.org/10.13374/j.issn2095-9389.2020.04.01.004; http://cje.ustb.edu.cn
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