电化学修复过程氢致钢筋塑性降低的影响与控制试验研究  

Experiential study on the effect of hydrogen-induced plasticity decrease and control in the process of electrochemical repair of reinforced concrete

作　　者：金伟良[1,2] 伍茜西 毛江鸿[2] 许晨[1] 陈佳芸[1] 夏晋[1] 

机构地区：[1]浙江大学结构工程研究所,浙江杭州310058 [2]浙江大学宁波理工学院,浙江宁波315100

出　　处：《海洋工程》2017年第5期88-94,共7页The Ocean Engineering

基　　金：国家自然科学基金资助项目(51638013;51578490;51408544;51408534);国家科技支撑计划资助项目(2015BAL02B03);宁波市科技惠民资助项目(2016C51024);省交通运输厅交通工程建设科研计划资助项目(2015J02);浙江省质量技术监督系统科研计划资助项目(20160137);杭州市重大科技创新专项资助项目(20142011A41)

摘　　要：电化学修复技术是提升既有钢筋混凝土结构耐久性重要方法,能有效除去有害氯离子,延长结构使用寿命。采用电化学修复技术对钢筋混凝土结构进行耐久性修复时,作为阴极的钢筋会发生析氢反应,当钢筋表面的氢浓度达到临界值时,钢筋的塑性会降低,并发展成裂纹,导致钢筋出现氢脆现象。开展了不同电化学参数的电化学修复试验,并采用物理方法和力学方法进行了氢致塑性降低的影响分析。结果表明氢致塑性降低与电流密度、应力水平均相关;当清楚工程构件的受力状态时,可采用合适的电流密度对构件进行电化学修复,控制塑性损失程度在工程的可接受范围内,以达到钢筋氢脆控制的目的。Electrochemical repair technologies are important methods to upgrade the durability for existing reinforced concrete,which can effectively remove harmful chloride ion,extending the life of structures. When applying electrochemical repair technologies to reinforced concrete,hydrogen evolution reaction would occur at the cathode. When reinforcement of the hydrogen concentration reaches a critical value,the reinforced plastic will reduce,and formed,developed into a crack,leading to reinforced hydrogen embrittlement.Carried out different electrochemical parameters of electrochemical repair test,and used physical and mechanical means to analysis hydrogen-induced plasticity decrease. Results showed that hydrogen-induced plasticity decrease was related to current density and stress levels. When the stress state of structures became clear,electrochemical repair can be applied to structures by using proper current density,in order to control plastic damage within the acceptable range of engineering,so that to achieve the goal of controlling hydrogen embrittlement of steel.

关 键 词：钢筋混凝土 耐久性 电化学修复 氢脆 氢脆评估 

分 类 号：TU511.3[建筑科学—建筑技术科学]