METHOD OF PREPARING CONCRETE MIXTURE Russian patent published in 2013 - IPC C04B40/00 

FIELD: chemistry.

SUBSTANCE: invention relates to construction and specifically to the technology of preparing concrete mixtures and articles therefrom. The method of preparing a concrete mixture involves mixing a portion of a calculated dose of grouting fluid with cement in a mixer-activator; feeding the remaining portion of the calculated dose of grouting fluid into a concrete mixer with an aggregate; subsequently feeding the suspension obtained in the mixer-activator into the concrete mixer and final mixing of the obtained mixture; the grouting fluid used is water which is poured into the mixer-activator in a volume of (40-70)% of the calculated formation dose of the grouting fluid which is activated when pouring into the mixer-activator by passing it at a rate of (1-2) m/s through a transverse magnetic field whose strength lies in the range of (500-2000) Oe; after pouring into the mixer-activator, said fluid is subjected to additional secondary activation by cavitation disintegration through exposure to ultrasound with frequency higher than the cavitation threshold in the low frequency range from 20 kHz to 100 kHz, and intensity of said ultrasound is in the range of stable cavitation from 1.5 W/cm² to 2.5 W/cm², wherein during cavitation disintegration of the grouting fluid, cement is added and stirred; the grouting fluid is poured into the mixer-activator while simultaneously pouring the remaining calculated formation dose of the grouting fluid into the concrete mixer with an aggregate, which is in form of water which, when pouring into the concrete mixer with an aggregate, is magnetised by also passing it at a rate of (1-2) m/s through a transverse magnetic field whose strength is in the range of (500-2000) Oe; after mixing the suspension - cement paste in the mixer-activator for 1-1.5 minutes, it is then discharged into the concrete mixer and the obtained mixture is finally stirred for 1.5-2 minutes.

EFFECT: faster hardening of the mixture and high strength of concrete.

1 dwg