Ceramics-Silikáty 55, (2) 153 - 160 (2011) |
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RESISTANCE OF ALKALI ACTIVATED WATER-COOLED SLAG GEOPOLYMER TO SULPHATE ATTACK
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El-Sayed H. A. 1, Abo El-Enein S. A. 2, Khater H. M. 1,
Hasanein S. A. 1
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1 Housing and Building National Research Centre (HBNRC), Egypt
2 Faculty of Science, Ain-Shams University Cairo, 87 El-Tahreer St., Dokki, Giza, P.O. Box 1770 Cairo, Egypt
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Keywords: Geopolymer, Ggbfs, Alkali, Activator, Durability
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Ground granulated blast furnace slag is a finely ground, rapidly chilled aluminosilicate melt material that is 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 sodium hydroxide and/or sodium silicate in
different ratios was studied. Curing was performed under 100 % relative humidity and at a temperature of 38°C. The results
showed that mixing of both sodium hydroxide and sodium silicate in ratio of 3:3 wt.,% is the optimum one giving better
mechanical as well as microstructural characteristics as compared with cement mortar that has various cement content
(cement : sand were 1:3 and 1:2). Durability of the water cooled slag in 5 % MgSO₄ as revealed by better microstructure
and high resistivity-clarifying that activation by 3:3 sodium hydroxide and sodium silicate, respectively is better than using
2 and 6 % of sodium hydroxide. |
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