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)

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.

Abstract:

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 strengt...