掺加硅藻土混凝土孔隙结构冻融破坏试验研究  

Experimental Study on Freezing and Thawing Failure Test of Diatomite Doped Concrete with Pore Structure

作　　者：秦泳[1] 徐彬 郑一峰[1] QIN Yong;XU Bin;ZHENG Yifeng(Construction Engineering College of Jilin University,Changchun 130026,China;Changchun Municipal Engineering Design Institute,Changchun 130026,China)

机构地区：[1]吉林大学建设工程学院,长春130026 [2]长春市市政工程设计研究院,长春130026

出　　处：《路基工程》2020年第5期43-48,共6页Subgrade Engineering

摘　　要：为提高寒冷地区混凝土结构的抗冻性,提出掺加硅藻土的方法来改善混凝土内部结构。以中等强度混凝土为研究主体,基于冻融循环试验,通过压汞测孔法与扫描电子显微镜分析混凝土结构孔隙特征,从而探究掺加硅藻土材料改变混凝土抗冻性的作用机理。结果表明:硅藻土掺量为1.5%的C30混凝土与硅藻土掺量为1.0%的C40混凝土的孔隙结构分布更为均匀,使大于100μm的孔隙数量减少,孔隙比例更小,从而减小了混凝土冻融破坏程度。In order to improve the frost resistance durability of concrete structures in cold areas,the method of adding diatomite is put forward to improve the internal structure of concrete.Taking medium strength concrete as the research object,on the basis of freeze-thaw cycle test results,the pore characteristics of concrete structure are analyzed by mercury intrusion and scanning electron microscope,so as to explore the mechanism of adding diatomite materials to improve the frost resistance of concrete.The research results show that the pore structure of C30 concrete with diatomite content of 1.5%and C40 concrete with diatomite content of 1.0%are more evenly distributed,which reduces the number of holes larger than 100μm and the pore ratio is smaller,thus reducing the concrete freezing and thawing failure degree.

关 键 词：硅藻土混凝土 孔隙结构 冻融破坏 压汞法 电镜扫描 

分 类 号：U414.1[交通运输工程—道路与铁道工程]