试验方法及碳化对混凝土氯离子扩散系数的影响  

Influence of test methods and carbonation on chloride ion diffusion coefficient of concrete

作　　者：庞超明[1,2] 高美蓉[1,2] 徐剑[3] 王伦[1,2,3] 刘冠国[3] 秦鸿根[1,2] 

机构地区：[1]东南大学材料科学与工程学院,南京211189 [2]东南大学江苏省土木工程材料重点实验室,南京211189 [3]江苏省交通科学研究院有限公司长大桥梁健康检测与诊断交通行业重点实验室,南京211112

出　　处：《东南大学学报（自然科学版）》2011年第6期1313-1318,共6页Journal of Southeast University：Natural Science Edition

基　　金：国家重点基础研究发展计划(973计划)资助项目(2009CB623200);国家自然科学基金资助项目(51108077);江苏省自然科学基金资助项目(BK2011612);江苏省崇启大桥建设资助项目(CQHT-ZG-09002)

摘　　要：为了研究现场氯离子扩散系数测试方法 Permit法的可靠性及碳化的影响,对比分析了自然浸泡法、RCM法和Permit法对强度为35～80 MPa混凝土的氯离子扩散系数测试结果的影响规律及碳化对3种方法的影响.分析结果表明:3种方法测试结果的变化规律基本相似,其中Permit法测得的氯离子扩散系数最低,且与RCM法规律更相似.对强度60 MPa以上双掺矿物掺合料或70 MPa以上高强混凝土,不宜采用RCM法和Permit法.碳化减少了自然浸泡时混凝土表面氯离子的富集,表层自由氯离子含量显著降低,计算得到的表观氯离子扩散系数却有所增加,但采用RCM法和Permit法的碳化后混凝土的氯离子扩散系数均显著降低.The comparison researches of influence of three test methods,pond,RCM（rapid chloride migration） and Permit,on chloride ion diffusion test results for concrete with strength from 35 to 80 MPa were investigated.The influence of carbonation on test methods in question was also analyzed.The test results show that the trend of the results tested by RCM method,pond method and Permit method is basically similar,while the chloride ion diffusion coefficient by Permit is lower than the results by pond and is more close to the results by RCM.For high strength concrete of over 70 MPa or concrete of strength over 60 MPa with two kinds of mineral admixture,the methods of RCM and Permit are not recommended because of larger error.The free chloride ion content of concrete in the surface layer 0 to 5 mm markedly decreases due to the carbonation.However,the chloride ion diffusion coefficient calculated after carbonation with pond method may increase a little.Meanwhile,the chloride ion diffusion coefficient in concrete tested by RCM and Permit after carbonation markedly decreases.

关 键 词：氯离子扩散系数 自然浸泡法 RCM法 Permit法 碳化 

分 类 号：TU528.01[建筑科学—建筑技术科学]