Zeolite-like products formed as microstructural phases of Geocements predetermines extra properties of a Geocement-based artificial stone (durability, high compressive strength, heat resistance etc.) and make it possible to use as binders for special composite building materials. On the other hand, fly ash is considered to be a perspective raw material for zeolite synthesis. This paper describes a study of environmental friendly fly ash based Geocements made by alkaline activation of fly ash. Similarities in terms of phase composition and in the hydration-dehydration structure formation process as well as extra properties and energy-effective technology for its production show the possibility of using fly ash as aluminosilicate source of Geocements instead of the traditional expensive one—metakaolin. It was studied interrelations between mix proportion, phase composition after hydration and dehydration and properties of Geocement-based materials. The developed systems are effective for application in heat-resistant composites including gas concretes.
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