对流效应对氯离子侵蚀混凝土过程的影响  

Effect of Convection on Chloride Penetration in Concrete

作　　者：李荣涛[1] LI Rong-tao(Key Laboratory for Prediction&Control on Complicated Structure System of the Education Department of Liaoning Province,Dalian University,Dalian 116622,China)

机构地区：[1]大连大学,辽宁省高校复杂结构体系灾害预测与防治重点实验室,大连116622

出　　处：《科学技术与工程》2021年第12期5066-5070,共5页Science Technology and Engineering

基　　金：国家自然科学基金(11302034);辽宁省自然科学基金(2019-ZD-0574);校级科研创新创业团队项目(XQN202002)。

摘　　要：氯离子侵蚀是影响钢筋混凝土结构耐久性的主要原因之一。为预测氯盐环境下混凝土中氯离子的概况,建立了多相耦合的氯离子侵蚀模型,模型中考虑到了非饱和条件下氯离子以扩散和对流两种方式传输。基于此模型,利用数值模拟手段探讨了对流效应对氯离子侵蚀混凝土过程的影响。分析结果表明:不仅扩散而且对流效应也对氯离子侵蚀混凝土过程有着显著影响,可为混凝土结构耐久性评估与设计提供参考。Chloride ions penetration is one of the major problems that affect the durability of reinforced concrete structures.To predict the chloride profile in concrete subjected to a saline environment,a coupled multiphase model of chloride ions penetration was developed.The model took the effect of diffusion and convection into account.Based on the proposed model,a numerical analysis of the effect of convection on chloride penetration in concrete was done.The results indicate that both chloride diffusion and convection flow of chloride ions have an important role in moving the chloride ions in concrete.It provides a reference for the realistic assessment and design for durability of concrete structures.

关 键 词：氯离子侵蚀 混凝土 数值分析 对流效应 

分 类 号：TU528.33[建筑科学—建筑技术科学]