FIELD: building materials industry. SUBSTANCE: claimed method comprises previously adding sufficient amount of aprotic polar solvent having dielectric permeability higher than that of alcohols (e.g. N,N-dimethylformamide,N,N-dimethylacetamide, ethylene carbonate, propylene carbonate or dimethyl sulfoxide) to aqueous electrolyte solution in which clays (or presuspended clays) are subjected to swelling and/or dispersion, or treating clays which are subjected to swelling or dispersion with said compound. EFFECT: improved activation method. 13 cl, 9 tbl
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