Effect of Corrosive Ions (Cl^-,SO4^2-,and Mg^2+) on the Nanostructure and Chloride Binding Property of C-A-S-H Gel

作     者：JIN Shucheng LIU Kai ZHANG Gaozhan SHI Hua DING Qingjun XU Wenyuan JIN Shucheng;LIU Kai;ZHANG Gaozhan;SHI Hua;DING Qingjun;徐文远

作者机构：School of Civil EngineeringNortheast Forestry UniversityHarbin 150040China China Construction Ready Mixed Concrete Co.LtdWuhan 430200China School of Materials and Chemical EngineeringAnhui Jianzhu UniversityHefei 230601China School of Materials Science and EngineeringWuhan University of TechnologyWuhan 430070China 

出 版 物：《Journal of Wuhan University of Technology(Materials Science)》 (武汉理工大学学报（材料科学英文版）)

年 卷 期：2020年第35卷第6期

页      面：1061-1072页

核心收录：

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

基　　金：Funded by the Key Science and Technology Project of Heilongjiang Transport Department(No.2017HLJ0029) the National Natural Science Foundation of China(Nos.51778513 and 51878003) the Key Projects of Anhui Province Outstanding Young Talents Support Plan(gxyqZD2019055) 

主　　题：calcium-silicate-hydrate ions attack Ca/Si ratio Al/Si aluminum uptake 

摘      要：The nanostructure and chloride binding capacity evolution of C-A-S-H gel exposed to aggressive solutions were investigated,utilizing 29Si NMR,27Al NMR,SEM-EDS,and XRD *** experimental results show that while Cl-ions show a smaller effect on the microstructure of C-A-S-H sample,and SO4^2-ions can react with C-A-S-H,resulting in decreasing Ca/Si and Al[4]/Si for the C-A-S-H gel (i e,decalcification and dealuminization).The presence of Mg^2+ ions can aggravate the decalcifying and dealuminizing effects of SO4^2-ions on the *** decreasing Ca/Si ratio and aluminum substitution for the original C-A-S-H gel,the depolymerization degree of silicate tetrahedra increases and the calcium aluminosilicate skeleton strengthens.C-A-S-H gel with lower Ca/Si ratio and higher Al[4]/Si ratio shows gentler nanostructure evolution under chemical attack,i e,improving thermodynamic stability under chemical ***,the chloride binding capacity of C-A-S-H gel is decreased after the sulfate *** substitution can also help C-A-S-H gel resist the degraded chloride binding capacity induced by sulfate attack.