FIELD: manufacture of building materials. SUBSTANCE: method includes stirring of preliminarily dosed siliceous rock (tripolith, diatomite, opoka) with alkali component to form mix, which is placed in molds and heated for 30-60 min at 40-60 C, after which mix is heated to 800-900 C at heating rate 15 to 150 C/min and held 20-30 min at that temperature. EFFECT: increased water resistance of material. 3 tbl
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