PORTLAND CEMENT Russian patent published in 2013 - IPC C04B7/52 

FIELD: chemistry.

SUBSTANCE: invention relates to cement compositions and can be used to produce novel types of cement used in construction, as well as mortar and concrete based thereon. In portland cement which contains portland cement clinker, gypsum dihydrate and an additive, the portland cement clinker used has the following mineral composition: 3CaO·SiO₂ 59-63 wt %, 2CaO·SiO₂ 16-18 wt %, 3CaO·Al₂O₃ 6-7.5 wt %, 4CaO·Al₂O₃·Fe₂O₃ 11-12 wt %; the mineral additive used is sodium fluoride, with the following ratio of components, wt %: portland cement clinker 95.93-98.77, gypsum dihydrate 0.50-1.92, sodium fluoride - the balance.

EFFECT: reduced water gain and faster setting of portland cement.

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