The role played by the reactive alumina content in the alkaline activation of fly ashes

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Quantitative determination of phases in the alkaline activation of fly ash. Part II: Degree of reaction (2006, background): “In fact, the Si–O–Si bonds are more thermodynamically stable than the Si–O–Al configuration, which is why zeolite precursors have been observed to grow progressively richer in silicon with time [6,25].”
A review: The comparison between alkali-activated slag (Si + Ca) and metakaolin (Si + Al) cements (2010, background): “It is well known that the availability of aluminum controls to a large degree the properties of geopolymers [68,69].”
Hardening evolution of geopolymers from setting to equilibrium: A review (2020, background): “aluminate and silicate species has been suggested based on Si-NMR data [92], while for the further reaction between silicate species, a slow condensation reaction has been proposed [91].”
Deep soft soil improvement by alkaline activation (2011, background): “Furthermore, according to Férnandez-Jimenez et al. (2006), theSi/Al ratio of aluminosilicate gel that is obtained from alkalineactivation of fly ash F is highly dependent on, among otherfactors, the synthesis temperature.”