FIELD: manufacture of building materials, particularly, methods of production of fillers from siliceous (opoka, tripoli) stony rocks for structural concretes. SUBSTANCE: method includes crushing, treatment of material surface with aqueous solution of sodium adipate and cooling. Filler in form of fraction sizing 10-15 mm is treated with solution of alkali sewage of caprolactam production of 5-10% concentration for 3-5 min with stirring and subsequent calcination. EFFECT: higher strength and frost resistance of filler from siliceous material. 1 dwg, 2 tbl
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