CONCRETE MIX PREPARATION METHOD Russian patent published in 2004 - IPC

FIELD: manufacture of building materials. SUBSTANCE: in a method of preparing concrete mix comprising stirring of cement, sand, broken stone, tempering water, and plasticizer-microsilica slurry, order of components fed into concrete mixer is the following: cement, sand, broken stone, and tempering water, after which above components are stirred for 0.5-0.9 min and then supplemented by plasticizer-microsilica slurry and additional water to achieve required workability followed by final stirring. Weight ratio of plasticizer (superplasticizer S-3) to microsilica in their slurry is 1:10 and that of dry components to water (1.0-1.2):(2.8-3.0). EFFECT: improved quality of mix and reduced preparation expenses. 4 cl, 1 tbl