Abstract
In the present work, a comparative study of the effect of the different molarities of sodium hydroxide (NaOH) on fly ash geopolymer paste was investigated. The geopolymer pastes were prepared by mixing fly ash with alkali activator (a mixture of sodium hydroxide and sodium silicate) at solid/liquid ratio of 2.5. The NaOH were used 6M, 8M, 10M, 12M and 14M with fixed sodium silicate/NaOH ratio of 2.5. The geopolymers were cured at room temperature (29°C) for 24 hours and at 60°C for another 24 hours. The testing and analysis of the fly ash geopolymers were performed after 28 days. The geopolymer paste showed highest compressive strength (35MPa) with 8M of NaOH solution.
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