Comparative performance of geopolymers made with metakaolin and fly ash after exposure to elevated temperatures

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Factors affecting the shrinkage of fly ash geopolymers (2011, methodology): “Increased porosity causes a decline in strength [5, 18].”
Compressive behaviour of sodium and potassium activators synthetized fly ash geopolymer at elevated temperatures: A comparative study (2016, methodology): “fly ash activated by sodium based alkali activators [2–5], fly ash activated by combined sodium and potassium based activators [6–8], combined fly ash and slag activated by sodium based activator [9], metakaolin activated by combined sodium and potassium based activators [10], etc.”
Fire Resistance Behaviour of Geopolymer Concrete: An Overview (2021, background): “The strength impacting mechanisms at high-ceilinged temperatures have been investigated in the context of effects of pore pressure as well as phase-transformations [42,44,65].”
The heavy metal adsorption characteristics on metakaolin-based geopolymer (2012, background): “Previous studies demonstrated that geopolymers could be composed from metakaolin or wastes, such as fly ash, slag, and tailing (Duxson et al., 2007; Goretta et al., 2007; Kong et al., 2007; Sindhunata et al., 2006; Yip et al., 2004).”