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This study discusses the effect of heating duration and curing age on compressive strength geopolymer paste made with medium calcium fly ash and potassium hydroxide solution (KOH). The hardening process was performed in an oven at a temperature of 100 ± 5°C in a variety of heating duration for 2, 4, and 6 hours to form a geopolymer paste with a potassium hydroxide concentration of 6 M. Flow testing on fresh paste indicatesd that all materials was bond properly without segregation. After the heating process in the oven, the spesimens were cured at room temperature until the age of 3, 7, and 28 days. The results of the compressive tests indicated that the heating duration and curing age were the key factors. Where there is no visible negative effect of the medium level CaO content in fly ash against compressive strength development of the hardened geopolymer paste.

Compressive strength of medium calcium fly ash based geopolymer paste