摘要
Abstract
Ordinary cement mortar is of low bending strength and brittleness and may be modified by carboxy butadiene styrene polymer emulsion.Then its laws of mechanical property change is studied and the microstructure is analyzed by scanning electronic microscope (SEM) and pore distribution measuring meter.The results show that with increase of polymer cement ratio (P/C),spatial network structure made up of inter-weaved polymer and cement hydration product is formed gradually inside the modified mortar; with increase of pore volume ratio less than 200(A),the pore diameter thinned and the dense degree of the mortar increases improving the brittleness; with decrease of compressive strength of the modified mortar,the bending strength and the ratio of it to compressive strength increase and the brittleness enhances; at the same time,the expansion degree increases and the viscosity increases at first and then decreases.关键词
丁苯聚合物乳液/改性水泥砂浆/力学性能/微观结构Key words
styrene-butadiene polymer emulsion/ modified cement mortar/ mechanical property/ microstructure分类
建筑与水利
