聚合物改性水泥浆体黏弹性的频率响应(Ⅰ):动态力学分析

Frequency Response of Viscoelasticity of Polymer Modified Cement Paste(Ⅰ):Dynamical Mechanical Analysis

采用动态力学分析的频域方法研究了聚合物改性水泥浆体的黏弹性,通过对柔量的复平面分析,采用二级标准固体流变模型来描述聚合物改性水泥浆体的黏弹性行为,并求得了模型参数.对3种配比的乙烯/醋酸乙烯共聚物(EVA)乳胶粉改性水泥浆体试样在0.01~100.00 Hz频率下的试验结果进行拟合,结果表明:二级标准固体流变模型简单实用,能较好地解释聚合物改性混凝土的黏弹性行为,进一步验证了频域方法的实用性,以及二级标准固体流变模型的适用性;所得结果对聚合物改性混凝土黏弹性的研究有一定的参考意义,在实际应用中可以为满足干缩和徐变要求的混凝土配合比设计提供参考.

Viscoelasticity of polymer modified cement paste can be measured by dynamical mechanical analysis in frequency domain.Complex plane analysis of compliance can be obtained to establish the rheological model of the material.From the form and the location of the imperfect semicircle on the compliance plane the parameters of the rheological model can also be determined.Samples of polymer modified cement paste of three different compositions were measured at different frequency range from 0.01 Hz to 100.00 Hz.The results show that the second order standard solid rheological model is suitable for practical use to explain the viscoelastic behavior of polymer modified concrete.The research bids fair to optimize the design of mix proportion of the concrete.