Alkali-activated fly ash-based geopolymers with zeolite or bentonite as additives

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One-part alkali-activated materials : a review (2018, background): “In alkali activation, however, bentonite shows a low reactivity as such [81], but it can be improved by thermal treatment at 550–850 °C [82–84].”
Binding mechanism and properties of alkali-activated fly ash/slag mortars (2013, background): “Its main reaction product of alkali-activated cements for slag is C–S–H [10–13] while for class F fly ash it is the amorphous hydrated alkali-aluminosilicate [14–18].”
An overview on the influence of various factors on the properties of geopolymer concrete derived from industrial by-products (2015, background): “Generally, a strong alkaline medium is necessary to increase the surface hydrolysis of the aluminosilicate particles present in the raw material while the concentration of the chemical activator has a pronounced effect on the mechanical properties of the geopolymers [26,27].”
Deep soft soil improvement by alkaline activation (2011, methodology): “For this reason, and also because of the environmental benefits of using a waste by-product (Hu et al., 2009), fly ash was used in this investigation.”
Soil stabilisation using alkaline activation of fly ash for self compacting rammed earth construction (2012, background): “Hu et al (2009) [21] concluded that adding calcium to the activator accelerates the synthesis of the fly ash-based geopolymers.”