COMPLEX ADDITIVE FOR CONCRETE MIX AND METHOD FOR ITS PREPARATION Russian patent published in 2015 - IPC C04B24/02 C04B103/14 C04B103/60 C04B103/65 

FIELD: construction.

SUBSTANCE: complex additive for concrete mix, which contains a plasticising agent and carbon nanotubes, differs by the fact that it contains Remicrete SP-60 hyperplasticising agent as the plasticising agent with density of 1.09 g/cm³, Taunit carbon nanotubes as carbon nanotubes, as well as Tiprom-S water-repellent agent at the following component ratio, wt %: Remicrete SP-60 hyperplasticising agent - 93.0-96.0, Taunit carbon nanotubes - 0.4-0.5, Tiprom-S water-repellent agent - 3.5-6.6. In the preparation method of the complex additive for concrete mix, which consists in ultrasonic dispergation of the plasticising agent and carbon nanotubes, Taunit carbon nanotubes are dispergated in Remicrete SP-60 hyperplasticising agent with density of 1.09 g/cm³ during 4-6 minutes at ultrasonic action power of 92 W with further exposure of the obtained mix during 5-10 minutes; after that, Tiprom-S water-repellent agent is added to the obtained dispersion and subject to repeated ultrasonic action with power of 92 W during 1.5-2 minutes.

EFFECT: improving strength of concrete during the first day of hardening; increasing grade strength, freeze resistance and water resistance.

2 cl, 1 tbl