FIELD: building industry. SUBSTANCE: present invention describes methods for preparing mixes with microsilica additive. The claimed method for preparing concrete mix comprises stirring cement, fillers, water, microsilica and chemical additives in mixer. Microsilica and chemical additives are added to mixture in the form of complex powdery modifier with granule size within 500 mcm and relative moisture content of 1-8 %. Said modifier is obtained by drying aqueous suspension of microsilica and chemical additives. Aqueous suspension comprises (wt %): 40-70 microsilica; and the water balance. Minimum time for stirring cement, fillers, water and complex powdery modifier is 3 minutes. EFFECT: concrete mixes retain plasticity for prolonged periods, and microsilica, superplasticizer and chemical additives have stable properties during prolonged storage and are freezing resistant. 2 cl, 1 tbl
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