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To study the processes of interaction and formation of the phase composition in slag-alkali binders based on fly ash, the alkaline ingredient solution was proportioned after 28 days of aging and after heat treatment, steam curing or setting in natural conditions. The products of interaction of slags and soda-sulfate mixture with highly basic additives were studied. Their phase composition was determined by the type of slag, additives, and setting conditions. The increase in density of alkaline ingredient solution from 1,100 to 1,300 kg/cm³ resulted in a 1.7–2 times higher compressive strength of set binder, which is 30.7, 47.1 and 45.9 MPa, depending on the liquid glass module. When the soda-sulfate mixture was introduced into the formula, the compressive strength of the steam-cured samples was 7–22% higher than that of the samples exposed to dry heat treatment. The strength of slag-alkali binders based on fly ash depended on the fineness of fly ash. The developed binding formulas can be used for the preparation of high-strength concretes and building materials.

PROPERTIES OF SLAG-ALKALI BINDERS BASED ON INDUSTRIAL WASTE