干湿交替对混凝土中氯离子分布影响的多相耦合数值分析  

Coupled Multiphase Numerical Analysis of the Effect of Drying-Wetting Cycles on Chloride Ion Distribution in Concrete

作　　者：李荣涛[1] TUAN Christopher Y LI Rongtao;TUAN Christopher Y(Key Laboratory for Prediction&Control on Complicated Structure System of the Education Department of Liaoning Province,Dalian University,Dalian 116622,China;Department of Civil Engineering,University of Nebraska-Lincoln,Omaha NE 68182,USA)

机构地区：[1]大连大学,辽宁省复杂结构体系灾害预测与防治重点实验室,大连116622 [2]内布拉斯加-林肯大学土木工程系,奥马哈68182

出　　处：《硅酸盐通报》2021年第2期480-484,共5页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金(11302034);辽宁省自然科学基金(2019-ZD-0574);辽宁省兴辽英才计划(XLYC1807219);大连大学科研创新创业团队项目(XQN202002)。

摘　　要：钢筋混凝土结构的耐久性会因为氯盐侵蚀而受到严重影响。为研究环境湿度对混凝土中氯离子分布的影响,建立了多相耦合的氯离子侵蚀模型,利用数值模拟方法探讨了氯离子侵蚀过程随环境湿度变化的规律。结果表明,环境湿度的改变不仅使混凝土中含水率产生变化,而且对混凝土中氯离子的分布产生显著影响,尤其是会引起孔隙中盐分结晶,这是混凝土性能退化的主要原因之一。数值模拟结果可为混凝土结构的减防腐蚀灾害设计提供重要的参考。Due to corrosion of steel by chloride ions,the durability of reinforced concrete structure is influenced strongly by chloride ingress.In order to study the effect of environmental humidity on chloride ion distribution in concrete,a coupled multiphase model of chloride ions penetration was developed.The variation of chloride ion erosion process with environmental humidity was studied by numerical simulation.The numerical simulation results show that the change of environmental humidity not only drives moisture transfer within the concrete,but also has significant effect on the chloride ion distribution in concrete,particularly induces formation reactions of salt crystals inside the concrete pores,which is recognized to be a major factor of degradation of concrete.The numerical simulation results will provide important reference for the anticorrosion design of concrete structures.

关 键 词：混凝土 干湿交替 氯离子传输 多相耦合 数值模拟 

分 类 号：TU528[建筑科学—建筑技术科学]