粉煤灰复合水泥浆体干燥收缩与孔结构关系的研究

The research of pore structure on drying shrinkage of fly ash cement paste

采用氮吸附法研究了不同掺量粉煤灰对水泥浆体孔结构的影响,分析了干燥收缩与孔径分布、孔隙率、比表面积的关系。结果表明:粉煤灰的掺入使复合水泥浆体孔隙率、比表面积增加,细化样品孔结构的同时使较小毛细孔的比例减小,从而一定程度抑制了干燥收缩。

In this paper the effect of mix proportion on pore structure of fly ash cement paste were researched by nitrogen-absorption,the relation between drying shrinkage and pore size distribution,pore volume,surface area were analysed.The results show that the adding of the fly ash increased pore volume,specific surface area of blended cement paste,refined the pore structure while decreased the proportion of the smaller pores,and thus restrained drying shrinkage to a certain extent.