钢筋混凝土电化学除氯技术研究  

Research on electrochemical chloride extraction of reinforced concrete

作　　者：刘兴旺 李晶 张凤双 高盼盼 邱小秦 勾俊芳 马晶军 LIU Xingwang;LI Jing;ZHANG Fengshuang;GAO Panpan;QIU Xiaoqin;GOU Junfang;MA Jingjun(College of Science and Technology, Hebei Agricultural University, Huanghua 061100, China)

机构地区：[1]河北农业大学理工学院

出　　处：《河北农业大学学报》2019年第3期120-124,共5页Journal of Hebei Agricultural University

基　　金：河北省教育厅指导项目(ZC2016043);河北农业大学理工基金项目(LG20140302);河北农业大学师生协同创新项目(bhxt201826);河北省住房和城乡建设厅项目(2019-141)

摘　　要：电化学除氯技术(ECE)是修复钢筋混凝土耐久性的1种有效方法。通过对电化学除氯过程中钢筋混凝土中氯离子传输机理的研究,为进一步探索电化学除氯原理、建立相应数学模型提供了必要条件。通过可嵌入式氯离子探针和化学滴定分析方法,对ECE过程中混凝土结构内部不同深度处的氯离子含量进行分析。研究不同水灰比混凝土在不同电流密度情况下的ECE效果。结果表明,在有电场作用的情况下,水灰比对氯离子渗透的影响很小,高电流密度可以导致高氯离子萃取效果;ECE开始时,混凝土最外层的自由氯离子含量最先开始下降,当混凝土内氯离子含量下降到一定值时,最内层氯离子也开始发生迁移。另外,对ECE过程中氯化物的分解反应做了分析。Electrochemical chloride extraction(ECE) is an effective method for rehabilitating reinforced concrete structure damaged by the corrosion process. The understanding of the chloride transference in reinforced concrete structure during ECE process is essential for further exploring the ECE mechanism and establishing the mathematical model. An embeddable chloride probe and chemical titration analysis were used for analyzing the chloride content in different depths of the concrete structure during the ECE process. The effect of ECE of concrete with different water-cement ratios at different current densities was studied. The results showed that the water-cement ratio could highly affect the chloride leak but only contribute a little when the electric field was applied. The higher current density applied could result in a higher chloride extraction. The outmost part showed the first decreasing of chloride content when the ECE process started and the chloride transference of innermost part started when the chloride concentration matches the chloride concentration of the whole concrete. Moreover, the content change of the bound chloride during the ECE process was also analyzed.

关 键 词：电化学除盐 钢筋混凝土 氯离子迁移 电流密度 

分 类 号：TU528.01[建筑科学—建筑技术科学]