梯度结构混凝土的界面力学性能与微观结构  

Interface Mechanical Property and Microstructure of Gradient Structural Concrete(GSC)

作　　者：王信刚[1] 马保国[2] 付洪波[3] 

机构地区：[1]南昌大学建筑工程学院,江西南昌330031 [2]武汉理工大学硅酸盐材料工程教育部重点实验室,湖北武汉430070 [3]河北大元建业集团,河北沧州062650

出　　处：《建筑材料学报》2010年第1期100-104,共5页Journal of Building Materials

基　　金：国家高技术研究发展计划(863计划)项目(2005AA332010);江西省教育厅青年科学基金资助项目(GJJ09428)

摘　　要：采用界面劈裂抗拉、显微硬度、SEM等测试手段综合评价了梯度结构混凝土（无细观界面过渡区水泥基复合材料（MIF）-高性能混凝土（HPC）,低渗透混凝土（LPC）-HPC）的界面力学性能与微观结构.结果表明：梯度结构混凝土进行两次浇注成型时,采用压印工艺可产生界面强化效应,提高界面黏结强度10%~35%,从而有效解决界面黏结强度降低的问题;整体上MIF-HPC净浆界面的显微硬度高于LPC-HPC,即MIF-HPC净浆界面的黏结状况好于LPC-HPC,这是因MIF-HPC净浆界面的水化产物结构比LPC-HPC的更为致密所致.The interface mechanical property and microstructure of GSC（meso-interfacial transition zone free cement based（materials（MIF）-high） performance（concrete（HPC）,） low permeability（concrete（LPC）-）HPC） were investigated by means of interface splitting tensile,microhardness and SEM tests.When the GSC was cast twice,interface bond strength was increased by 10% to 35% by means of imprinting process as compared to the control without imprinting process.Imprinting process can result in the effect of interface strengthening,and resolve the problem of interface bond strength decreasing.Microhardness of interface of MIF-HPC paste is higher than that of LPC-HPC paste, and the status of interface bond of MIF-HPC paste is superior to that of LPC-HPC paste.This is because hydration products in interface of MIF-HPC paste is denser than that of LPC-HPC paste.

关 键 词：梯度结构混凝土 界面黏结强度 界面强化 显微硬度 

分 类 号：TU528[建筑科学—建筑技术科学]