矿渣种类对新型石膏矿渣硫铝酸盐水泥水化硬化的影响

矿渣的理化特性差异对新型石膏矿渣硫铝酸盐水泥(SAC-GS)各方面性能均有很大影响,因此本文选取3种生产用的典型矿渣,尝试多维度构建矿渣组成结构与SAC-GS宏观性能方面的联系。采用X射线衍射(XRD)、X光电子能谱(XPS)等方法对各矿渣的矿物组成、元素组成及其存在状态进行对比分析。通过扫描电镜(SEM)、XRD等方法分析各水泥硬化浆体试样的水化过程,并测试各试样不同水化龄期的抗压、抗折强度,对比其早期水化放热速率、孔径分布等,结果表明铝含量更高且活性更高的矿渣,其水泥试样强度发展更快、水化程度更高、孔结构更加致密。基于以上分析,SAC-GS应选用高铝含量的矿渣原料。

Effects of Slag Types on Hydration and Hardening of New Gypsum Slag Sulphoaluminate Cement

The difference of physical and chemical properties of slag has a great effect on the performance of new gypsum slag sulphoaluminate cement (SAC-GS). Therefore, three typical slags for production were selected to try to construct the relationship between the composition, structure of slag and the macroscopic properties of SAC-GS in multiple dimensions. The mineral composition, element composition and the existence state of each slag were compared and analyzed by X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The hydration process of each hardened cement paste sample was analyzed by Scanning electron microscope (SEM), XRD and other methods, and the compressive and flexural strength of each sample at different hydration ages were tested, and the early hydration heat release evolution and pore size distribution were compared. The results show that the slag with higher aluminum content and higher reactivity has faster strength development, higher hydration degree and denser pore structure of cement sample. Slag with high aluminum content should be selected for the preparation of SAC-GS.