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

Abstract:

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.

• Periodical: Key Engineering Materials (Volume 768)
• Pages: 314-319
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.768.314
• Online since: April 2018
• Authors: Jing Ran Wang*, Chang Ming Ke, Jin Hua Zhang, Xue Xin Liu
• Keywords: High Aluminum Cement, Hydration, Microstructure, Nano-SiO₂

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