(57) The invention is related to nanocement production methods by modifying Portland cement, as well as to nanocement compositions. The nanocement production method involves a mechanochemical activation of dispersed grains of Portland cement in the presence of polymeric modifier, with the sodium naphthalenesulfonate content of at least 60 wt %, mineral siliceous additive containing at least 30 wt % Si02 and gypsum, to form continuous nanoshells - capsules of 20-100 nm in thickness on Portland cement grains made of sodium naphthalenesulfonate structured by calcium cations; in this case, the mechanochemical activation of Portland cement is combined with grinding the material to a specific surface area of 300–900 m2/kg and is carried out in a ball mill with the following ratio of initial components, wt %:
Portland cement or Portland cement clinker: ⇥30.0–90.0
Specified polymeric modifier:⇥0.5–2.0
Specified siliceous additive:⇥the rest
This method makes it possible to improve the cement construction and technical properties to classes 72.5–82.5, to reduce the cement prime cost, to reduce drastically the specific fuel consumption, and emissions of NOx, SO2 and CO2.
(71) Sakrytoe Aktsyonernoe Obschestvo “Imetstroi” Moscow 127521 (RU)
(84) AL AT BE BG CH CY CZ DE DK EE ES Fl FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR; BA ME