干湿循环下含矿物掺合料混凝土抗氯离子渗透性能研究  

Experimental Investigation on Chloride-ion Penetration Resistance of Mineral Admixture Containing Concrete under Drying-wetting Cycles

作　　者：刘静静 陈在铁[2] Liu Jingjing;Chen Zaitie(Shazhou Professional Institute of Technology,Zhangjiagang 215600,Jiangsu,China)

机构地区：[1]沙洲职业工学院建筑工程系,江苏张家港215600 [2]沙洲职业工学院科研处

出　　处：《沙洲职业工学院学报》2022年第3期7-11,共5页Journal of Shazhou Professional Institute of Technology

摘　　要：氯离子扩散系数是反映钢筋混凝土结构耐久性的一个关键参数。以60%矿物掺合料部分取代水泥,研究混凝土抗氯离子渗透性能,分析讨论水胶比、侵蚀环境和侵蚀时间对氯离子扩散系数的影响。试验结果表明:混凝土氯离子扩散系数随侵蚀时间推移而降低;干湿循环下混凝土氯离子扩散系数明显高于全浸泡;水胶比对氯离子扩散系数变化有较大影响,一般情况下,氯离子扩散系数随着水胶比的增加而增加。The coefficient of chloride diffusion is regarded as one of the crucial parameters to characterize the durability of reinforced concrete structures. In this paper, 60% mineral admixture was used to partially replace the cement to study the chloride penetration resistance of concrete. The effects of the ratio of water to cement,exposure environment and exposure time on the coefficient of chloride diffusion was analyzed and discussed.The results indicate that the coefficient of chloride diffusion decreases with the increasing exposure time, that the coefficient of chloride diffusion under drying-wetting cycles is significantly higher than completely immersing. The coefficient of chloride diffusion is mostly affected by the ratio of water to cement. In general,the coefficient of chloride diffusion increases with the increase of ratio of water to cement.

关 键 词：混凝土 氯离子扩散系数 干湿循环 矿物掺合料 

分 类 号：TU528[建筑科学—建筑技术科学]