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ARPN Journal of Science and Technology >> Volume 7, Issue 2, November 2017

ARPN Journal of Science and Technology

Effect of Nano-Silica on Alkali Activated Water-Cooled Slag Geopolymer

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Author H.M.Khater, B.A.El-Sabbagh, M.Fanny, M.Ezzat, M.Lottfy
ISSN 2225-7217
On Pages 170-176
Volume No. 2
Issue No. 3
Issue Date May 01, 2012
Publishing Date May 01, 2012
Keywords Nano- silica, Geopolymer, Slag, Microstructure, Thermal properties.


Ground granulated blast furnace slag is a finely ground, rapidly chilled aluminosilicate melt material separated from molten iron in the blast furnace as a by-product. Rapid cooling results in an amorphous or a glassy phase known as GGBFS or water-cooled slag (WCS). Alkaline activation of latent hydraulic WCS by 6% sodium hydroxide was studied. Nano silica is an ultrafine material that can modify mechanical, microstructural and thermal properties of geopolymer products and added to the geopolymer mix in the ratio of 0, 0.50,1 and 1.5% of the dry weight. Curing was performed under 100% relative humidity and at a temperature of 38oC. Gelenium Ace super-plasticizer was added in the ratio of 4% from the dry weight to ensure best dispersion of the nano silica. The results showed that increasing in the percentage of nano silica results in enhancement in the mechanical properties as compared to the control mix up to 90 days. The study of thermal properties is taken place for the different ratios by experimental and mathematical evaluation. The study showed that the thermal properties as well as thermal insulation property are improved with the increase of ratio of nano silica.

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