丁苯乳液改性水泥砂浆的力学性能与体积密度

在固定水灰比为0．4且改变养护条件下，研究了丁苯乳液掺量对改性水泥砂浆体积密度和力学性能的影响，并对改性水泥砂浆力学性能与体积密度间的相互关系进行分析．结果表明：当丁苯乳液掺量在0～20％（质量分数，下同）之间变化时，改性水泥砂浆体积密度在8％丁苯乳液掺量时最低；改性水泥砂浆的抗压强度和抗折强度在0～8％丁苯乳液掺量之间随丁苯乳液掺量的增加而下降；在丁苯乳液掺量小于10％时，改性水泥砂浆的动弹性模量随着丁苯乳液掺量的增加而减小；当丁苯乳液掺量小于10％时，改性水泥砂浆抗压强度、动弹性模量均与体积密度之间存在着较好的线性对应关系，而抗折强度与其相关性则不明显．

Mechanical Properties and Bulk Density of Styrene-Butadiene Copolymer Emulsion(SD622S) Modified Cement Mortar

Effects of content of styrene-butadiene copolymer emulsion(SD622S) on the bulk density and mechanical properties of cement mortar with varying curing conditions at fixed water-cement ratio of 0.40 were investigated.The relationship between mechanical properties and bulk density of the modified cement mortar was also studied.The test results show that when addition of SD622S ranges from 0% to 20%, the bulk density reaches minimum at 8% SD622S.With the addition of SD622S lower than 8%,the compressive strength and the flexural strength decrease with increasing SD622S content.With use level below 10% of SD622S,the dynamic elastic modulus decreases with increasing SD622S content.When use level of SD622S is less than 10%,there exits a very close correlation between compressive strength(or dynamic elastic modulus) and bulk density,but the correlation between flexural strength and bulk density is not clear.