Influence of calcium compounds on the mechanical properties of fly ash geopolymer pastes.

By J. Temuujin, A. Riessen, Ross P. Williams. Journal of Hazardous Materials, 2009

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Impact of curing temperatures and alkaline activators on compressive strength and porosity of ternary blended geopolymer mortars (2018, neutral): “Several studies were conducted to improve the structural strength of GPMs produced using FA with the inclusion of CaO as additive [37,38].”
A Review of Recent Developments and Advances in Eco-Friendly Geopolymer Concrete (2020, background): “The addition of calcium hydroxide improved the dissolution process of FA in alkaline activator media due to precipitation of CSH or CASH phases [100].”
Structure and strength of NaOH activated concretes containing fly ash or GGBFS as the sole binder (2010, background): “The presence of calcium oxide in the source material also influences the properties, especially because of the formation of more than one reaction product [17].”
Durability of alkali-activated binders: A clear advantage over Portland cement or an unproven issue? (2012, background): “[68] refer that although ambient cured fly ash alkali-activated binders exhibited efflorescences that phenomena does not occur when the same alkali-activated binders are cured at elevated temperature which means the leachate sodium could be a sign of insufficient geopolymerisation.”