Microstructure Development of Alkali-Activated Fly Ash Cement: A Descriptive Model

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Hardening evolution of geopolymers from setting to equilibrium: A review (2020, background): “that aluminate has a faster initial dissolution rate, and is more soluble than silicate at a constant pH and low temperatures, such as room temperature [32, 91, 92].”
EFFECT OF SODIUM HYDROXIDE CONCENTRATION ON FRESH PROPERTIES AND COMPRESSIVE STRENGTH OF SELF-COMPACTING GEOPOLYMER CONCRETE (2013, background): “[8] on the effects of alkaline solution on the final product of geopolymer has shown that a combination of sodium hydroxide and sodium silicate produced a solid material almost without pores and has a strong bond between aggregate and geopolymer matrix.”
Alkali–aggregate reaction in activated fly ash systems (2007, background): “Crystalline zeolites such as herschelite, hydroxysodalite and so on are obtained as secondary products [16–18].”
An XRD Study of the Effect of the SiO2/Na2O Ratio on the Alkali Activation of Fly Ash (2007, background): “Although the mechanisms that regulate the reactions between alkaline activator and fly ash are not fully understood, the models that are gradually being developed afford a fairly precise view of what actually takes place [3,4].”
Fiber-reinforced geopolymer composites: A review (2020, background): “After mixing, the alkali activator dissolves the aluminosilicate precursors, and aluminate and silicate monomers are released, which later undergo polycondensation reaction [3].”