Alkali activation of metakaolins: parameters affecting mechanical, structural and microstructural properties

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Nanoindentation characteristics of alkali-activated aluminosilicate materials (2011, background): “Based on thorough argumentation and SEM images, three other morphologically distinct phases were found in AAFA and one in AAMK.”
Geopolymer technology, from fundamentals to advanced applications: a review (2009, result): “Similar results have been reported previously.(54) Although dissolution of Al–Si species increases on increasing the concentration of alkali solution, excessive amounts of NaOH or KOH in the aqueous phase decrease the SiO2/Na2O ratio and so inhibit polycondensation.”
Application of alkali-activated materials for water and wastewater treatment: a review (2019, background): “However, a too high Na2O/SiO2 ratio can inhibit the reaction (Granizo et al. 2007).”
Study on solids-to-liquid and alkaline activator ratios on kaolin-based geopolymers (2012, background): “In early study, researchers have focused on metakaolin as the aluminosilicate source [19,20].”