RAW MATERIAL MIXTURE Russian patent published in 2006 - IPC C04B28/04 C04B111/20 

FIELD: manufacture of building materials; manufacture of articles from fine concrete in civilian and industrial construction engineering.

SUBSTANCE: proposed raw material mixture includes Portland cement, filler, sand, complex additive and water; used as filler is dolomitized limestone at specific surface S_spec.= 200 m²/kg including 35% of MgCO₃; used as sand is granite crumb at size of grain of 0.8-1.4 mm; used as complex additive is 20-% solution of sol of orthosilicic acid at pH=3.0-4.0, modified calcium formate Ca(CHOO)₂ and plasticizing agent C-3 at the following ratio of components, mass-%: 20-% solution of sol of orthosilicic acid at pH= 3.0-4.0, 40.45-41.67; calcium formate Ca(CHOO)₂, 6.25-6.50; plasticizing agent C-3, 52.08-53.05 at the following ratio of components of raw material mixture, mass-%: Portland cement, 38.08-42.04; filler - dolomitized limestone, 3.98-4.20; sand, 38.99-41.25; additive, 0.38-0.43; water, 14.61-16.04.

EFFECT: enhanced compressive and bending strength; reduced shrinkage.

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