METHOD OF PREPARING CONCRETE MIXTURE FOR HIGH-STRENGTH CONCRETE Russian patent published in 2020 - IPC C04B40/00 C04B28/00 C04B14/06 C04B14/36 C04B24/00 

FIELD: chemistry.

SUBSTANCE: invention relates to the technology of preparing concrete mixtures, mainly for high-strength concrete, used for making articles and structures used in industrial and civil construction when erecting special-purpose structures. Method involves mixing cement, sand, crushed stone, additives and water. At that, at first, into the mixer is loaded and mixed to obtain a homogeneous mixture of 5–20 mm fractioned grains, ordinary quartz sand with a fineness modulus of not less than 2.1, lignosulphonate additive ST 1.4 in amount of dry substance 0.1–0.15 % of consumption cement and 70–80 % of tempering water. After that, cement, polycarboxylate base-based superplasticizer ST 5.0 in amount of 0.30–0.35 % of dry matter of cement consumption, as well as the rest of the tempering water are added to the obtained mixture and all components are finally mixed until a homogeneous concrete mixture is obtained.

EFFECT: technical result is higher mobility of concrete mixture without reducing strength of concrete in 28-day age of normal hardening.

1 cl, 1 tbl