Effects of Nano-SiO2 on Properties of Spinel-Containing High Alumina Cement

This research was studied the effect of 15 nm SiO2 on the hydration behavior, hydration process and microstructure of spinel-containing high alumina cement (HAC), which is from high titanium blast furnace slag via smelting reduction method of Ti-Si-Fe making process. The results showed that with the increase of nano-SiO2, the heat released rate of hydration and the maximum peak were decreased and advanced. Accumulation of hydration heat to release was considerably improved before 16h. Nano-SiO2 can promote the formation of hydration products or promote the hexagonal phases CaAl2O4·10H2O and Ca2Al2O5·8H2O change into cubic phase Ca3Al2O6·6H2O, which has the pozzolanic and filler effects, which The pore size distribution of the hydration products was enhanced by nano-SiO2. At the same time, the flexural and compressive strength was increased gradually.