FIELD: manufacture of building materials, making binder compositions and preparation of mortar mixes. SUBSTANCE: binder comprises old concrete crushed together with superplasticizer to specific surface of 450-550 sq m/kg in weight ratio of 100:2.5-3.0, respectively. Mineral component comprises further 0.1- 99.9 wt % of portland cement. Method of preparing mortar mix comprises mixing said binder with filler composed of old concrete and water and is useful for making concretes and mortars. EFFECT: improved properties of mortar mix. 4 cl, 2 tbl
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