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文章通过多种方法研究了氢氧化钠和水合硅酸钠(即水玻璃)对两种不同Al2O3含量矿渣的水化过程的影响。在所研究的体系中,主要的水化产物为包含铝的水化硅酸钙石C-S-H以及Mg/Al为2的一种类水滑石相。NaOH激发体系中的C-S-H凝胶结晶更好,含水量也更少。水化时间较长时,水化硅酸钙(C-S-H)和富含钠的C-N-S-H具有相似的钙含量。NaOH激发体系早期强度高,但是7d以及更长时间的强度比水合硅酸钠体系低。与水合硅酸钠相比,NaOH激发体系中的C-S-H结构存在很大的差异,这导致了在相同反应程度下,NaOH激活体系的毛细孔较粗、抗压强度也较低。
In this paper, the effects of sodium hydroxide and hydrated sodium silicate (ie, sodium silicate) on the hydration process of two kinds of slag with different Al2O3 contents have been studied by various methods. In the system studied, the major hydration products are aluminum-containing hydrated calcium silicate C-S-H and a Mg-Al-like hydrotalcite-like phase. The C-S-H gel in the NaOH excitation system crystallizes better and contains less water. With longer hydration times, hydrated calcium silicate (C-S-H) and sodium-enriched C-N-S-H have similar calcium content. The NaOH excitation system had high early strength but lower strength at 7 days and longer than the hydrated sodium silicate system. Compared with hydrated sodium silicate, the structure of C-S-H in NaOH excitation system is quite different, which leads to the coarser pores and lower compressive strength of NaOH activation system under the same reaction conditions.