混凝土电化学脱盐模拟及其影响因素分析  

Numerical modeling of concrete electrochemical chloride extraction and analysis of its influencing factors

作　　者：梁建[1,2] 唐亚文 张超 王翠霞[4] 李瑞忠 LIANG Jian;TANG Yawen;ZHANG Chao;WANG Cuixia;LI Ruizhong(Anhui&Huaihe River Institute of Hydraulic Research,Hefei 230088,China;Key Laboratory of the Ministry of Education on Binhai Civil Engineering Structure and Security,School of Civil Engineering,Tianjin University,Tianjin 300072,China;Yantai Urban Planning and Compilation Research Center,Yantai 264000,China;School of Water Conservancy Engineering,Zhengzhou University,Zhengzhou 450001,China;SEPCOⅢElectric Power Construction Co.,Ltd.,Qingdao 266100,China)

机构地区：[1]安徽省·水利部淮河水利委员会水利科学研究院,安徽合肥230088 [2]天津大学建筑工程学院滨海土木工程结构与安全教育部重点实验室,天津300072 [3]烟台市城市规划编研中心,山东烟台264000 [4]郑州大学水利科学与工程学院,河南郑州450001 [5]山东电力建设第三工程有限公司,山东青岛266100

出　　处：《水资源与水工程学报》2021年第5期188-193,共6页Journal of Water Resources and Water Engineering

基　　金：国家自然科学基金项目(51909242、52009125);天津大学水利工程仿真与安全国家重点实验室开放基金项目(HESS-2104);中国博士后科学基金项目(2020TQ0285、2021T140619、2021M692939);安徽省水利科学研究院青年科技创新基金项目(KY201707);河南省高等学校重点科研项目(21A570007)。

摘　　要：电化学方法可以用来对含有氯离子的混凝土进行脱盐。电流密度的大小和环境温度的高低是影响电化学脱盐效率的主要因素,过大的电流密度会对钢筋混凝土的性能产生一定影响,而较低的温度会降低脱盐效率。基于氯离子输运方程和温度对氯离子扩散系数的影响,建立了氯离子输运数值模型,得到了不同工作电流密度和温度下混凝土的电化学脱盐效率。结果表明:温度对脱盐效果影响显著,较高温度(303.15 K)时的氯离子渗透系数是较低温度(273.15 K)时的8.8倍;随着温度的升高,取得同样脱盐效果所需要的电流越小,即在较高温度环境下可以使用较低电流达到较高的脱盐效率。Electrochemical methods can be used to extract chloride from concrete containing chloride ions.Electricity currents and temperature are the main factors influencing the electrochemical chloride extraction process.Excessive currents density has an effect on the performance and integrity of the steel reinforced concrete,while lower temperatures reduce chloride extraction efficiency.The influence of chloride ion transport equation and temperature on chloride ion permeability coefficient is studied in this paper.Then a finite element model of chloride ion transport was established to analyze the electrochemical chloride extraction efficiency of concrete under different currents and temperatures.The results show that the temperature has a significant impact on the chloride extraction effect,and the chloride ion permeability coefficient at the higher temperature(303.15 K)is 8.8 times of that at the lower temperature(273.15 K).As the temperature increases,the currents required to achieve the same chloride extraction effect becomes smaller,i.e.similar chloride extraction efficiency can be achieved with lower currents in a higher temperature environment.

关 键 词：混凝土 电化学脱盐 氯离子渗透系数 电流 温度 电迁移 

分 类 号：TV332[水利工程—水工结构工程]