Important pore structure parameters related to mechanical properties and durability of cement-based materials can be determined by techniques such as scanning electron microscopy (SEM), mercury intrusion porosimetry (MIP), and low temperature calorimetry (LTC). The methods provide information on porosity characteristics as pore volume, pore thresholds and/or pore size distribution in different size ranges and do therefore to a large extent supplement each other. Pastes of w/b=0.4 with 0%, 40% or 70% slag by volume were cured saturated at 20°C for up to two years. The porosity was characterized by LTC, MIP, and SEM. Higher volume of pores was obtained by MIP compared to results obtained using LTC and SEM. Measured porosity was correlated with predicted porosity using information on the density and degree of hydration of the cement and slag. Porosity estimation showed best agreement with the porosity data measured by MIP. The use of slag showed the same trend for all tests: a higher total volume of pores, but a lower threshold pore size when compared with Portland cement paste. The findings illustrate the importance of measuring not only pore volume but also threshold pore sizes when characterizing porosity of cement-based materials with different binder compositions.
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机译：重要的孔结构与机械性能和基于水泥材料的耐久性相关的参数可以通过扫描电子显微镜（SEM），汞侵入孔隙胶质剂（MIP）和低温量热法（LTC）来确定。该方法提供有关孔隙率特性的信息，作为孔体积，孔隙阈值和/或孔径分布在不同尺寸范围内，因此在很大程度上彼此补充。 W / B = 0.4的浆料在0％，40％或70％的体积下固化在20℃下固化长达两年。孔隙率的特征在于LTC，MIP和SEM。与使用LTC和SEM获得的结果相比，通过MIP获得较高体积的孔。使用关于水泥和炉渣的密度的信息，测量的孔隙率与预测的孔隙率相关。孔隙率估计显示了与MIP测量的孔隙率数据的最佳协议。使用渣的使用表现出相同的所有测试趋势：与波特兰水泥浆料相比，孔的总体积较高，但阈值孔径较低。该发现说明了当用不同的粘合剂组合物表征基于水泥基材料的孔隙率时测量不仅测量孔体积的重要性，而且还测量阈值孔径。
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