Performance of Fly ash Based Geopolymer Mortars in Sulphate Solution
By S. Thokchom, P. Ghosh, Somnath Ghosh. 2010
137 citations recorded by the source corpus.
An experimental investigation was conducted to study the performance of fly ash based geopolymer mortar specimens in Magnesium Sulphate solution. Specimens were manufactured from low calcium fly ash by activation with a mixture of Sodium Hydroxide and Sodium Silicate solution and cured thermally. 10% by weight Magnesium Sulphate solution was used to soak the specimen up to 24 weeks. Performance of the specimens was evaluated in terms of visual appearance, variation of pH of solution, change in weight, and change in compressive strength over the exposure period. White deposits occurred on the surface of specimen which was initially soft but later converted to hard crystals. pH of solution increased noticeably during the initial weeks which indicate migration of alkalis from mortar specimens. At the end of 24 weeks samples experienced very little weight gain and recorded a loss of compressive strength by up to 56%.
Subfields: Building and Construction, Civil and Structural Engineering, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/1c8ccb8d3a44056a53c03647d7f6dcb45faa092a
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Citations in the corpus
- The Durability of Alkali-Activated Materials in Comparison with Ordinary Portland Cements and Concretes: A Review (2020, background): “In comparison, C-(A)-S-H gel, as the main product in calcium-rich AAM, has worse sulfate resistance to the formation of gypsum and ettringite [38,40,41].”
- Review on fly ash-based geopolymer concrete without portland cement (2011, background): “Even so, all the specimens only recorded a small gain weight compared to normal concrete (Thokchom et al., 2010).”