高温后混凝土抗氯离子渗透性能的试验研究  

Experimental Research on Resistance of Concrete to Chloride Penetration after High Temperature

作　　者：高润东[1,2] 许清风[1,2] 李向民[1,2] 王琼[2] 於林锋[2] 

机构地区：[1]上海市工程结构新技术重点实验室,上海200032 [2]上海市建筑科学研究院(集团)有限公司,上海200032

出　　处：《建筑材料学报》2014年第4期690-694,共5页Journal of Building Materials

基　　金：上海市应用技术开发项目(2011-114);上海市人才发展基金资助项目(2011058);上海自然科学基金资助项目(12ZR1426800)

摘　　要：用RCM法和电通量法2种方法测试了高温后不同配比混凝土的抗氯离子渗透特性,比较了2种方法的测试结果,并通过SEM观测了高温前后混凝土微观结构的变化.结果表明:高温前和高温后,混凝土强度等级对氯离子渗透性均有明显影响;随着温度升高,混凝土的氯离子渗透性不断提高,特别是当温度达到800℃时有显著增加;RCM法和电通量法所测指标的变化趋势基本一致,但RCM法能更为准确地反映出高温对各配比混凝土孔隙结构的影响规律;高温前后混凝土微观结构变化与其宏观上氯离子渗透性的变化规律相符.By both test methods of rapid chloride migration（RCM） and coulomb electric flux, resistance of concrete of different mix proportion to chloride penetration after high temperature was measured. Results by two methods were compared with each other, and meanwhile concrete micro-structure change before and after high temperature was also observed by SEM. Test results indicated both before and after high temperature, concrete strength has obvious effect on chloride penetration; with temperature elevated, chloride penetration is increased, which is extremely remarkable for 800 ℃ ; the main change trends of test results by both test methods of RCM and coulomb electric flux were similar, however, the former could more finely reflect the effect of high temperature on concrete pore structure; before and after high temper- ature, the concrete micro-structure change is in accord with the degree of chloride penetration.

关 键 词：RCM法 电通量法 高温 混凝土 微观结构 

分 类 号：TU528.01[建筑科学—建筑技术科学]