强电场作用下早龄期混凝土的氯离子迁移特征  

Characteristics of chloride ion migration in early-age concrete under strong electric field

作　　者：金立兵[1] 王培胜 毛江鸿 樊玮洁 何建明 JIN Libing;WANG Peisheng;MAO Jianghong;FAN Weijie;HE Jianming(School of Civil Engineering,Henan University of Technology,Zhengzhou 450001,P.R.China;College of Architecture and Environment,Sichuan University,Chengdu 610065,P.R.China;School of Civil Engineering and Architecture,Ningbo Tech University,Ningbo 315100,Zhejiang,P.R.China;Zhejiang Guangtian Component Group Co.,Ltd.,Ningbo 315000,Zhejiang,P.R.China)

机构地区：[1]河南工业大学土木工程学院,郑州450001 [2]四川大学建筑与环境学院,成都610065 [3]浙大宁波理工学院土木建筑工程学院,浙江宁波315100 [4]浙江广天构件集团股份有限公司,浙江宁波315000

出　　处：《土木与环境工程学报（中英文）》2024年第4期186-192,共7页Journal of Civil and Environmental Engineering

基　　金：国家自然科学基金(51878610、 51638013、 51509084);宁波市科技重大专项(2020Z056);河南省科技攻关计划(212102110191)。

摘　　要：电化学除氯技术能有效降低混凝土结构中的有害氯离子,降低混凝土结构失效风险。采用强电场方式对混凝土结构进行电化学除氯,并在不同的早龄期时间介入40、80、120 min的强电场作用,测试了内部氯离子含量变化和分布特征,并对通电后养护28 d试件进行回弹强度试验。研究结果表明:早龄期介入强电场作用能显著提高除氯效率,达到相同除氯效果时的作业时间约为传统电化学方法的1/300;氯离子分布特征表明,自由氯离子分布较传统电化学参数作用时更均匀,结合氯离子仍然存在保护层中间堆积现象;强电场作用后进行标准养护,回弹测试结果表明,强电场对混凝土的保护层宏观强度无明显影响。Electrochemical chloride extraction can effectively eliminate harmful chloride ions of concrete structures and reduce the failure risk of concrete structures.The electrochemical dechlorination of concrete structure was carried out by means of strong electric field,and the strong electric field action of 40 min,80 min and 120 min was involved in different early ages.The change and distribution characteristics of internal chloride content were tested,and the springback strength test was carried out on the specimens cured for 28 days after electrification.The results show that the chlorine removal efficiency can be significantly improved by the intervention of strong electric field at an early age,and the working time is about 1/300 of the traditional electrochemical methods when reaching the same chlorine removal effect.The distribution characteristics of chloride ions show that the distribution of free chloride ions is more uniform than that of traditional electrochemical parameters,and the bound chloride ions still have the phenomenon of accumulation in the middle of the protective layer.The standard curing is carried out after the action of strong electric field,and the rebound test results show that the strong electric field has no obvious effect on the macroscopic strength of the concrete protective layer.

关 键 词：混凝土结构 电化学除氯 养护期 强电场 结构耐久性 

分 类 号：TU375[建筑科学—结构工程]