Alkaline Activation of Fly Ashes: NMR Study of the Reaction Products

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Alkali-activated binders: A review: Part 1. Historical background, terminology, reaction mechanisms and hydration products (2008, background): “4 and 5). The activation of fly ashes is a process that may be considered as a zeolitization in which the last phase does not occur, since the experimental conditions lead to very fast dissolution and condensation reactions but a lower one when the hardening take place [ 39 ].”
Factors influencing the compressive strength of fly ash based geopolymers (2016, background): “Another study [26] found that increasing the curing temperature 224 from 45 °C to 65 °C resulted in a 5-fold rise of mechanical strength, whereas a 10-fold rise was observed 225 between 65 °C and 85 °C.”
Corrosion resistance in activated fly ash mortars (2005, background): “Moreover, when the amount of reacting material crosses the 45–50% threshold, the kinetics of these reactions plunge to very low levels [ 21 ], whereby the system may be expected to store a certain amount of reserve alkalinity over time.”