The Chloride Permeability of Persulphated Phosphogypsum-Slag Cement Concrete

作     者：黄有强 LU Jianxin CHEN Feixiang 水中和 

作者机构：State Key Laboratory of Silicate Materials for ArchitecturesWuhan University of TechnologyWuhan 430070China China Railway Bridge Science Research InstituteLtdWuhan 430034China 

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：2016年第31卷第5期

页      面：1031-1037页

核心收录：

学科分类：08[工学] 081304[工学-建筑技术科学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0813[工学-建筑学] 

基　　金：Funded by the National High Technology Research and Development Program of China(863 Program)(No.2012AA06A112) 

主　　题：PPSCC chloride permeability pore structure ITZ 

摘      要：The chloride permeability and microstructure of persulphated phosphogypsum-slag cement concrete（PPSCC）, the Portland slag cement concrete（PSCC） and ordinary Portland cement concrete（OPCC） were investigated comparatively. Some test methods were used to evaluate the chloride permeability and explain the relationship between the permeability and microstructure of concrete. The results show that the resistance to chloride penetration in PPSCC is significantly better than that in OPCC, the reasons are as follows： 1） the slag in PPSCC is activated by clinker（alkali activation） and phosphogypsum（sulfate activation）, forming more low Ca/Si C-S-H gel and gel pores below 10 nm than OPCC, improving the resistance to chloride penetration; 2） the hydration products of PPSCC have a much stronger binding capacity for chloride ions; and 3） in the same mix proportion, PPSCC has a better workability without large crystals calcium hydroxide in the hydration products, the interfacial transition zone（ITZ） is smoother and denser, which can cut off the communicating pores between the pastes and aggregates.