聚合物改性水泥水化程度测定方法比较

Comparison of Methods for Determination of Hydration Degree of Polymer Modified Cement Paste

介绍了当前测试水泥水化程度的几种方法:水化热法、化学结合水法、氢氧化钙含量测定法和背散射电子图像分析法。比较了这些方法对聚合物改性水泥水化程度测试的适用性和局限性。聚合物由于改变了水泥水化进程和水化产物的组成、其本身热分解的温度又与水化产物相近,在多种测试方法中都会对水泥水化程度测试带来干扰,使得测试结果存在较大的偏差。而背散射电子图像分析法是基于某一龄期未水化颗粒占原始颗粒的比例来表征水化程度的,而与水化过程和水化产物的组成无关,是测试聚合物存在下水泥水化程度的一种可靠方法。

Four methods for the determination of cement hydration degree, i.e., hydration heat, chemical-bond water, Ca（OH）2 quan-titative measurement and backscattered electronic image analysis （BEI）, were introduced. The suitability and limitations of these methods for polymer modified cement paste （PMC） were discussed. When some methods were used to examine the cement hydration degrees of PMC, the interference and large deviations could be imported due to the polymer change of hydration process and hydrated products and the similarities of thermal decomposition temperaalre between polymers and hydrated products. The BEI as a method based on the volume fraction of un-hydrated particles has no connection with hydration process or hydrated products, which is an appropriate method for the quantitative characterization of the hydration degree of PMC.