PHC管桩蒸压养护混凝土的力学性能与界面亚微观结构  

Mechanical Property and Interface Microstructure of Autoclaved Curing Concrete of PHC Pile

作　　者：薛力梨[1] 蒋元海[1] 杨琳[2] 刘红飞[1] 许顺良 

机构地区：[1]嘉兴学院建筑工程学院,嘉兴314001 [2]东南大学江苏省土木工程材料重点实验室,南京211189 [3]嘉兴欣创混凝土制品有限公司,嘉兴314001

出　　处：《硅酸盐通报》2015年第9期2662-2667,共6页Bulletin of the Chinese Ceramic Society

基　　金：浙江省自然科学基金(LY12E08013)

摘　　要：对掺不同矿物掺合料的PHC管桩混凝土进行力学性能测试,采用环境扫描电子显微镜和压汞等测试方法,对混凝土界面亚微观结构进行形态观察以及孔隙率特征分析。结果表明:经过常压-蒸压二次养护的混凝土力学性能明显提高,强度增幅从19.2%到65.3%不等;掺20%磨细硅砂粉和30%矿粉的PHC管桩混凝土经过蒸压养护后抗压强度达80 MPa以上;通过ESEM观察到蒸压混凝土浆-集料界面富集托贝莫来石晶体C5S6H5。孔结构测试结果可以解释宏观力学性能测试结果。掺30%矿粉的PHC管桩蒸压混凝土力学性能最佳。The mechanical properties of PHC pile concrete with different mineral admixture were tested, the pore structure and interface microstructure of the concrete were analyzed by ESEM and MIP. The result show that, the mechanical property of concrete can be improved after autoclaved curing, and strength increases ranging from 19.2% to 65.3%. The compressive strength of PHC pile concrete with 20% ground silica sand or with 30% ground slag can reach more than 80 MPa after autoclaved curing;the tobermorite C5S6H5 can be observed in ESEM photograph of interface of autoclaved curing concrete. Pore analysis could explain the test result of mechanical properties. The PHC pile concrete with 30% ground slag show the best mechanical properties.

关 键 词：蒸压混凝土 界面微观分析 托贝莫来石 力学性能 

分 类 号：TU528[建筑科学—建筑技术科学]