混凝土中氯离子-硫酸根离子耦合扩散模型  

Coupled Diffusion Model of Chloride and Sulfate Ions in Concrete

作　　者：刘玖赢 田水[1] 谷倩[1] LIU Jiu-ying;TIAN Shui;GU Qian(School of Civil Engineering and Architecture,Wuhan University of Technology,Wuhan 430070,China)

机构地区：[1]武汉理工大学土木工程与建筑学院,武汉430070

出　　处：《武汉理工大学学报》2023年第11期57-61,共5页Journal of Wuhan University of Technology

摘　　要：为了研究混凝土中硫酸根离子与氯离子扩散的相互影响,引入硫酸根离子侵蚀损伤演化理论,分析了硫酸根离子侵蚀对混凝土孔隙率的影响和混凝土孔隙率对氯离子扩散的影响,提出了考虑硫酸根离子影响的氯离子扩散系数。通过菲克定律推导出的一维扩散模型对实验数据进行拟合,确定了待定系数aD的值,建立了考虑硫酸根离子侵蚀损伤演化的氯离子扩散模型。In order to study the mutual influence of sulfate ion and chloride ion diffusion in concrete,the evolution theory of sulfate ion erosion damage was introduced to analyze the influence of sulfate ion erosion on concrete porosity and the influence of concrete porosity on chloride ion diffusion,and the chloride ion diffusion coefficient considering the influence of sulfate ion was proposed.The one-dimensional diffusion model derived from Fick’s law was used to fit the experimental data and determine the value of the undetermined coefficient at different times.In addition,the chloride ion diffusion model considering the erosion damage evolution of sulfate ions was established by aD.

关 键 词：混凝土耐久性 损伤演化 孔隙率 耦合作用 扩散模型 

分 类 号：TU313[建筑科学—结构工程]