摘要
研究了偏高岭土(MK)对水泥基复合材料的氯离子固化能力和抗氯离子渗透性的影响。试验结果表明:掺入MK能够提高水泥基复合材料的氯离子固化能力,改善抗氯离子渗透性;当MK掺量为15%时,水泥基复合材料的氯离子固化率和抗氯离子渗透性最佳。XRD和DTG分析表明:MK能够通过参与水泥水化反应生成无机聚合物凝胶和Friedel盐,从而提高对氯离子的固化能力;孔结构分析验证了MK的填充效应可有效降低和延缓氯离子在水泥基复合材料中的迁移,优化了孔径分布,降低了孔隙率。
The effect of highly active metakaolin(MK)on chloride curing ability and chloride penetration resistance of cement-based composites was studied.The results show that the addition of MK can improve the chloride ion curing ability of cement-based composites,and improve the resistance to chloride ion penetration.When the content of MK is 15%,the chloride ion curing rate and chloride ion penetration resistance of cement-based composite are the best.XRD and DTG results show that MK can produce inorganic polymer gel and Friedel’s salt by participating in the cement hydration reaction,thus improving the chloride ion curing ability.The pore structure analysis verifies that the filling effect of MK can effectively reduce and delay the migration of chloride ions in the cement-based composite,optimize the pore size distribution and reduce the porosity.
作者
王军平
WANG Jun-ping(China Railway 11th Bureau Group The Sixth Engineering Co.,Ltd.,Xiangyang 441000,China)
出处
《混凝土与水泥制品》
2023年第2期10-14,共5页
China Concrete and Cement Products
基金
中国博士后科学基金资助项目(2019M662917)
中铁十一局集团第六工程有限公司科技计划项目(SG88-2018-444B2)
广州市科技计划项目(201902010072)
广东省基础与应用基础研究基金区域联合基金项目(2019A1515110836)。
