杂散电流与盐溶液共存环境下地铁隧道管片混凝土砂浆相的氯离子迁移规律试验研究  

Experimental study on chloride migration in mortar phase of concrete for metro tunnel segment under the coexistence of stray current and salt solution

作　　者：云强 张硕 赵汝英 吴江 祝雯 YUN Qiang;ZHANG Shuo;ZHAO Ruying;WU Jiang;ZHU Wen(China Railway Construction South China Construction Co.,Ltd.,Guangzhou 511496,China;Guangzhou Institute of Building Science Group Co.,Ltd.,Guangzhou 510440,China;Guangzhou Testing Center of Construction Quality and Safety Co.,Ltd.,Guangzhou 510440,China)

机构地区：[1]中铁建华南建设有限公司,广东广州511496 [2]广州市建筑科学研究院集团有限公司,广东广州510440 [3]广州建设工程质量安全检测中心有限公司,广东广州510440

出　　处：《混凝土》2024年第7期54-57,共4页Concrete

基　　金：国家自然科学基金(52108213);中国博士后科学基金(2021M700938)。

摘　　要：通过室内试验,研究了杂散电流与盐溶液共存环境对地铁隧道管片混凝土砂浆相的氯离子迁移规律的影响。将试件浸泡于氯盐溶液和氯盐硫酸盐复合溶液中,并外加直流杂散电流,得到不同环境组合情况下氯离子在砂浆中的分布情况。试验结果表明:砂浆中的氯离子含量沿渗透深度方向大致呈指数型分布;直流电场下氯离子在砂浆中的迁移速率显著提升,砂浆各深度处的氯离子含量显著增加;复合盐溶液浸泡下,砂浆中的最大氯离子含量总是低于单独氯盐溶液浸泡的,硫酸根离子的存在对氯离子在砂浆中的迁移产生了一定的抑制作用。The influences of the coexistence of stray current and salt solution on the chloride migration in mortar phase of concrete for metro tunnel segment were studied through laboratory experiment.The specimens were immersed in salt solution,a mixture of chloride and sulfate,and the DC stray current was applied.Then the distribution of chloride ions in mortar was obtained after the conditioning.The experimental results show that the chloride content in mortar is roughly exponentially distributed along the direction of penetration.Under DC electric field,the migration rate of chloride ions in mortar is significantly accelerated,and the chloride content at each depth in mortar is significantly increased.The maximum chloride content in mortar immersed in compound salt solution is always lower than that immersed in single chloride solution,and the existence of sulfate has a certain inhibitory effect on the migration of chlorideion,

关 键 词：杂散电流 盐环境 地铁隧道管片 混凝土 砂浆相 氯离子 

分 类 号：TU528.01[建筑科学—建筑技术科学]