大掺量钢渣复合胶凝材料早期水化性能和浆体结构

EARLY HYDRATION CHARACTERISTICS AND PASTE STRUCTURE OF COMPLEX BINDING MATERIAL CONTAINING HIGH-VOLUME STEEL SLAG

通过对胶凝材料早期水化放热性能和水化产物种类的测定,以及对硬化浆体显微形貌和孔结构的观察,研究了大掺量钢渣复合胶凝材料的早期水化性能和硬化浆体结构。结果表明:钢渣具有弱胶凝性能,早期活性低,大掺量钢渣使复合胶凝材料的水化诱导期延长,水化放热量降低,但对水泥早期的水化产物形成过程影响很小。大掺量钢渣复合胶凝材料早期的硬化浆体结构较疏松,孔隙率高于纯水泥浆体,且大孔数量较多。

Early hydration characteristics and paste structure of complex binding material containing high-volume steel slag were studied by the determination of hydration heat evolution, type of hydration products as well as micromorphology of hardened paste using calorimetry, X-ray diffraction, pressure porosimeter, and envirnoment scanning electron microscope. The results show that steel slag has somewhat cementitious properties and low activity at early ages. The dormant period is elongated and the accumulative heat is reduced during the hydration by the addition of large amounts of steel slag in the binding material. However, the influence of high-volume steel slag replacement on the hydration products of Portland cement during the early period is not significant. The hardened paste of complex binding material containing high volumes of steel slag has a less dense microstructure, coarser pores and higher porosity than that of Portland cement.