NaOH-activated ground fly ash geopolymer cured at ambient temperature

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Clean production and properties of geopolymer concrete; A review (2020, background): “Another research reported that the POFA-based GeoPC revealed a lower sorptivity due to contribution to the rise of particles’ surface area (Detphan and Chindaprasirt, 2009; Somna et al., 2011; Wongpa et al., 2010).”
Effects of fly ash characteristics and alkaline activator components on compressive strength of fly ash-based geopolymer mortar (2018, methodology): “The 185 ranges of the AL/FA ratios were selected according to previous investigations [6, 51-53].”
Stabilisation of black cotton soil for subgrade application using fly ash geopolymer (2018, background): “The UCS value is found to increase with an increase in curing period, which is due to the formation of geopolymeric binder from the reaction of Si and Al in the presence of alkaline medium (Somna et al., 2011).”
Critical review on fly‐ash based geopolymer concrete (2019, background): “However, under ambient temperature, without additives the geoplymerization of high calium FA was slow, which yields low strength.(38,82) Addition of Portland cement in geopolymer made with high calcium FA was more effective in strength development.”