利用聚合物的高阻尼特性和材料的表面改性技术,在水泥砂浆中掺加一定掺量的苯丙乳液、硅粉和改性的硅粉,制作了90个3点弯曲标准试件;然后利用粘弹谱仪VA4000在(-30～30℃)温度和(0.1～2Hz)条件下测定了各种阻尼增强水泥砂浆的损耗因子和储存模量,并对试验结果进行了分析.研究结果表明:这3种掺料均能提高水泥砂浆的损耗因子,其中苯丙乳液是最有效的,在30℃和0.5Hz条件下最高能达到0.25,这主要是由于苯丙乳液的玻璃态温度是22℃;改性的硅粉和硅粉是最有效提高水泥砂浆储存模量的外加掺料,能提高大约50%～80%.虽然苯丙乳液使水泥砂浆的储存模量有所下降,但对于综合评价材料阻尼能力的指标-耗散模量(损耗因子和储存模量的乘积)而言,苯丙乳液能大幅提高水泥砂浆的抗震能力;另外利用红外光谱X射线衍射和扫描电镜分析了硅粉的硅烷化提高硅粉水泥砂浆阻尼的机理.本文的试验结果也为今后进一步研究自增强阻尼混凝土提供了基础.
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