SU1036702A1 - Method for preparing cellular concrete mix - Google Patents

Abstract

METHOD PREPARING THE CELLULAR CONCRETE MIXTURE, including the dosing of raw materials and mixing them, is characterized in that, to increase the strength of the concrete, after mixing the components, the mixture is subjected to electrohydraulic treatment with a pulse frequency of 10-100 Hz and energy of 0.14, 5 kJ followed by heating the mixture with currents of ionic conductors, and mixing is carried out at an overpressure of 0.5-2 MPa.

Description

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The invention relates to autoclaved concrete technology, and more specifically to methods for producing cellular concrete.

A known method of manufacturing aerated concrete consists in that the aerated concrete mixture is subjected to electrical heating with a simultaneous vibration by fl J.

However, since the intensification of gas evolution and structure formation of the mixture takes place during the period of molding and holding the products before autoclaving, this lengthens the technological process and reduces the shape turnaround rates.

The closest to the invention to the technical essence is a method of manufacturing products from a porous cellular-concrete lassa, including the dosing of raw materials, their mixing, swelling of the mass under the vibration effect of 2 J.

The known method has the disadvantage that the preparation of cellular concrete mixture is carried out with a preliminary heating of the raw materials and, in addition, the products have low strength.

The aim of the invention is to increase the strength of concrete.

This goal is achieved by the fact that according to the method of preparing the cellular-concrete mixture, including

dosing of raw components and their mixing, after mixing the components, the mixture is subjected to electrohydraulic processing with a frequency of high-voltage pulses of Hz and an energy of 0.14, 5 kJ, followed by heating the mixture with ionic conduction currents, and mixing is carried out at an excess pressure of 0.5-2 MPa .

Example. Cellular concrete mixture, consisting, wt.%: Lime. 11.7; Portland cement 400 13.8; ground sand 43.4; aluminum powder - gasifier 0.07; the rest of the water is mixed in a gas concrete mixer under a pressure of 0.5 and 2.0 MPa, then the cellular concrete mixture is pumped through a discharge-pulse chamber system, the first of which is set to disperse, at a discharge frequency of 10 and 100 Hz and energy with a pulse of 0.1 and 4.5 kJ with the initiating element, and the second for heating the cellular concrete mixture with currents of ionic conductivity with the same energy parameters, but with a long interelectrode distance of 70-100 mm. Raw, components of the cellular concrete mixture is not preheated.

The test results of samples of cellular concrete made by the proposed method, and control samples are shown in the table.

The density of concrete, kg / cm

Strength - at

compression, MPa

The temperature of the mixture before processing, with

The temperature of the mixture after heating currents ion. conductivity, ° С

The duration of the expansion of the mixture, min

Energy of the high voltage pulse, kJ

Pulse frequency, Hz

Pressure in the mixer, M

715 715

730 4.8

5.7 5.8

22

44

22

54

51

but

12

0.1

0.2

50 1.0

100 2.0

The initiation of high-voltage discharges in a highly electrically conducting cellular concrete mixture allows a significant increase in their efficiency and an increase in the effect of activation of the raw material components of the mixture.

Thus, the proposed method eliminates the preheating of raw materials and significantly improves the technical properties of cellular concrete in terms of strength, and also reduces the duration of the production cycle, due to the intensification of process 5 of structure formation.

The economic effect of izovrete is 1.2.2 rubles. on 1 m of aerated concrete.

Claims (1)

METHOD. PREPARATION OF A CELL-CONCRETE MIXTURE, including dosing of raw materials and their mixing, is distinguished by the fact that, in order to increase the strength of concrete, after mixing the components, the mixture is subjected to electro-hydraulic treatment with a pulse repetition rate of 10-100 Hz and an energy of 0.1 - 4.5 kJ, followed by heating the mixture with currents of ionic conductivity, and mixing is carried out at an excess pressure of 0.5-2 MPa.