The strength and microstructure of two geopolymers derived from metakaolin and red mud-fly ash admixture: A comparative study

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Sustainable utilization of bauxite residue (Red Mud) as a road material in pavements: A critical review (2020, methodology): “Scanning electron micrograph of red mud: (a) [82]; (b) [80].”
Clean production and properties of geopolymer concrete; A review (2020, methodology): “Given the high alkalinity and water content of this material, the safe and economic disposal of RM poses a major environmental concern for alumina refineries (Dharmendra S. Ravat and Dave, 2017; He et al., 2013, 2012; Kumar and Kumar, 2013; PARAMGURU et al., 2004).”
Fly ash-based geopolymer: clean production, properties and applications (2016, background): “In the context, the Si/Al ratio significantly determines the final struct re of the resulted geopolymer materials (He et al., 2012).”
Composition and technological properties of geopolymers based on metakaolin and red mud (2013, background): “Moreover, the highly alkaline nature of red mud presents high expectations about its role as activator [27].”
Influence of iron making slags on strength and microstructure of fly ash geopolymer (2013, unknown): “The most commonly used raw materials for geopolymers are clay and metakaolin [4–6].”