基于孔隙结构预测水泥基体的氯离子扩散系数  

A Pore Structure Based Prediction of Chloride Diffusivity for Cement Paste

作　　者：高云[1] 吴凯[2] 穆松[3] GAO Yun;WU Kai;MU Song(School of Materials Science and Engineering,Southeast University,Nanjing 211189,China;School of Materials Science and Engineering,Tongji University,Shanghai 201804,China;State Key Laboratory of High Performance Civil Engineering Materials,Jiangsu Research Institute of Building Science Co.,Ltd.,Nanjing 210008,China)

机构地区：[1]东南大学材料科学与工程学院,江苏南京211189 [2]同济大学材料科学与工程学院,上海201804 [3]江苏省建筑科学研究院有限公司高性能土木工程材料国家重点实验室,江苏南京210008

出　　处：《建筑材料学报》2022年第4期375-380,共6页Journal of Building Materials

基　　金：国家自然科学基金资助项目(U1706222,52078123);“十三五”国家重点研发计划资助项目(2017YFB0309904)。

摘　　要：采用多尺度分形模型构建水泥基体的孔隙结构,在此基础上结合Maxwell公式,计算并预测了采用不同胶凝材料体系配制的水泥基体氯离子扩散系数.进一步采用压汞法(MIP)测试孔隙的结构参数,借助氯离子电迁移法(RCM)验证了所建立的氯离子扩散系数预测方法的有效性.该预测方法可广泛适用于采用不同胶凝材料体系配制的水泥基体氯离子扩散系数计算,为准确预测混凝土中的氯离子传输扩散过程提供了新的途径.Chloride diffusivity of cement paste was predicted in combination of multiscale fractal model and Maxwell equation.In particular,the multiscale fractal model built up pore structure in cement paste,while the Maxwell equation was used to calculate the associated chloride diffusivity.Parametric analysis of pore structure was carried out through the mercury intrusion porosimetry(MIP)test.The prediction of chloride diffusivity was validated with the rapid chloride migration(RCM)test.The proposed method may be extended to other cementitious systems,which provides a new routine for the prediction of chloride diffusivity.

关 键 词：水泥基体 孔隙结构 氯离子扩散系数 多尺度分形模型 Maxwell公式 

分 类 号：TQ172[化学工程—水泥工业]