Kinetics of geopolymerization: Role of Al2O3 and SiO2

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Lightweight concretes of activated metakaolin-fly ash binders, with blast furnace slag aggregates (2010, neutral): “This phenomenon was similarly reported before [43], where it was suggested that all the Na added at mixing was not necessarily incorporated in the geopolymer phase.”
Structure and strength of NaOH activated concretes containing fly ash or GGBFS as the sole binder (2010, background): “Previous studies have shown that the amount of vitreous silica and alumina present in the starting material plays a significant role in activation reactions and the properties of the reaction product [10,16].”
An overview on the influence of various factors on the properties of geopolymer concrete derived from industrial by-products (2015, background): “On the other hand, condensation reaction in high Si/Al system would results in predominantly between the silicate species itself, forming oligomeric silcates which in turn condense with Al(OH4) and forms geopolymeric structures of poly(sialate-siloxo) and poly(sialate-disiloxo) [15,32].”
NaOH-activated ground fly ash geopolymer cured at ambient temperature (2011, background): “A decrease in Si/Al ratio could lead to the aluminosilicate compound of lower strength, accompanied by microstructure with increased crystalline phase [24].”