Influence of the starting kaolin on alkali-activated materials based on metakaolin. Study of the reaction parameters by isothermal conduction calorimetry

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Sulfate and acid resistance of lithomarge-based geopolymer mortars (2018, background): “In terms of the precursor, the most common candidates are high purity kaolin [43, 44] and different types of clays [45-47], or waste/by-product materials, such as slags [40] and ashes [40, 48-50].”
Effects SiO2/Na2O molar ratio on mechanical properties and the microstructure of nano-SiO2 metakaolin-based geopolymers (2014, background): “Bands near 800 cm 1 on the spectra for the initial metakaolin (corresponding to the Al(IV)–O vibration band) were also observed [29].”
Alkali activation of metakaolins: parameters affecting mechanical, structural and microstructural properties (2007, result): “It has been concluded from FTIR, 27Al, 29Si MAS NMR and 23Na MAS NMR [ 1-6 ] studies that its three-dimensional structure is a network [Q4(Al)] consisting in”