Resistance of Alkali Activated Water-Cooled Slag Geopolymer to Sulphate Attack
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 la...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
University of Chemistry and Technology, Prague
2011-06-01
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| Series: | Ceramics-Silikáty |
| Subjects: | |
| Online Access: | http://www.ceramics-silikaty.cz/2011/pdf/2011_02_153.pdf |
| Summary: | 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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| ISSN: | 0862-5468 1804-5847 |