FIELD: construction.
SUBSTANCE: method for producing cement with an additive, comprising firing serpentinite, grinding it to the fraction of less than 30 microns, and subsequently administering it as a mineral additive in the amount of 2-30 wt % into Portland cement or the mixture of Portland cement clinker and gypsum at the stage of their grinding, wherein before firing the serpentinite is irrigated with the aqueous solution of a sodium, or potassium, or calcium salt, or the aqueous solution of the mixture of said salts at the total content of salts 0.02-1.0% by weight of serpentinite.
EFFECT: increasing the strength.
2 ex, 2 tbl
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