高温后混凝土抗冻性能的试验研究  

Experimental Research on Resistance Performance to Freezing-thawing of Concrete after High Temperature

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

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

出　　处：《结构工程师》2013年第6期119-123,共5页Structural Engineers

基　　金：上海市科委应用技术开发项目(2011-114);上海市人才发展资金资助项目(2011058)

摘　　要：通过试验研究了混凝土经历不同高温作用后的抗冻性能,并探讨了高温对混凝土冻融破坏的影响机理。研究结果表明:随温度升高,混凝土中的凝胶体不断分解,孔隙结构不断破坏,使得遭受高温后混凝土抗冻性能降低;未受高温作用混凝土的抗冻等级远高于F150,经历300℃高温混凝土的抗冻等级略高于F150,分别经历600℃和800℃高温混凝土的抗冻等级均低于F50。The resistance performances to freezing-thawing of concrete after different high temperatures were tested,and the effect mechanisms of high temperature on freezing-thawing failure of concrete were discussed.With the increase of the temperature,the gel in concrete was decomposed and the pore structure was destroyed gradually,which made the resistance performance to freezing-thawing of concrete after high temperature was obviously decreased.The resistance class to freezing-thawing of concrete in normal temperature was far higher than F150,and the resistance class to freezing-thawing of concrete after 300 ℃ was a little higher than F150.But the resistance class to freezing-thawing of concrete after 600 ℃ and 800 ℃ were all both less than F5O.

关 键 词：高温 混凝土 冻融循环 抗冻等级 

分 类 号：TU528[建筑科学—建筑技术科学]