The effect of adding nano-SiO2 and nano-Al2O3 on properties of high calcium fly ash geopolymer cured

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Effects of nano-silica on the strength development of geopolymer cured at room temperature (2015, background): “The effects of nano-silica in OPC systems are widely investigated and it was found as an effective additive towards the mechanical and microstructural development [32].”
Nano-modification of cementitious material: toward a stronger and durable concrete (2016, methodology): “XRD of geopolymer pastes at 28 days with various nano-Al2O3 (1, 2, and 3%).[39] 14 S.”
Clean production and properties of geopolymer concrete; A review (2020, background): “Furthermore, the addition of slag in the FA-based GeoPC mixture enhances the compressive strength and reduces the setting time (Adam, 2009; Kumaravel, 2014; Phoo-ngernkham et al., 2014).”
Characterization of alkali activated slag–fly ash blends containing nano-silica (2015, background): “[32] studied the effect of nano-silica on fly ash based geopolymers, showing that increasing the nano-silica content results in the decrease of setting time and the increment of mechanical properties.”
Engineering properties and carbon footprint of ground granulated blast-furnace slag-palm oil fuel ash-based structural geopolymer concrete (2015, background): “In the presence of an alkaline activator and calcium from the GGBS, the additional SiO2 and Al2O3 could react and form C-S-H or C-A-S-H and N-A-S-H gels and lead to a higher strength geopolymer [42].”