纳米SiO2改性再生混凝土抗氯离子的渗透性能实验  

Experimental study on chlorine ion penetation resistance of nano-SiO2 modified recycled concrete

作　　者：林腾玮 刘孙涛 罗素蓉[1] 刘钰煜 LIN Tengwei;LIU Suntao;LUO Surong;LIU Yuyu(College of Civil Engineering,Fuzhou University,Fuzhou,Fujian 350108,China)

机构地区：[1]福州大学土木工程学院

出　　处：《福州大学学报（自然科学版）》2019年第4期533-537,共5页Journal of Fuzhou University(Natural Science Edition)

基　　金：国家自然科学基金海峡联合基金重点支持项目(U1605242);大学生创新创业训练计划资助项目(201710386016)

摘　　要：为了得到纳米SiO 2溶液改性再生骨料的最佳处理方式及改性处理后再生混凝土的抗氯离子渗透性能,采用3组不同浓度(2%、4%、6%)纳米SiO 2溶液、浸渍时间不同(24、36、48、60和72 h)的方式对再生骨料进行改性处理.通过NEL法研究SiO 2溶液改性后再生骨料不同取代率(50%、70%、100%)的再生混凝土氯离子扩散系数,并与未经改性处理的取代率为100%的再生混凝土比较.结果表明:通过纳米SiO 2溶液改性处理后的再生混凝土强度和抗氯离子渗透性能比未经改性处理的再生混凝土有较大提升,质量浓度4%浸渍36 h时处理效果最为显著.In order to obtain the best treatment method of recycled aggregate modified by nano-SiO 2 solution and the resistance to chloride ion permeation of recycled concrete after modification,three groups of different concentrations of SiO 2 solution were used(2%,4%,6%).The regenerated aggregate was modified with different impregnation time of 24,36,48,60 h.The chloride diffusion coefficient of recycled concrete with different substitution rate(0%,50%,70%,100%)was studied by NEL method.The results were compared with recycled concrete with 100%substitution rate without modification.The results show that:the strength and chloride penetration resistance of recycled concrete treated with nano-SiO 2 solution were much higher than that of unmodified recycled concrete,and the treatment effect was most remarkable when the mass concentration was 4%impregnated for 36 h.

关 键 词：再生骨料混凝土 纳米 SIO2 改性 取代率 抗 Cl^-渗透性能 NEL 法 

分 类 号：X799.1[环境科学与工程—环境工程] TU528.51[建筑科学—建筑技术科学]