RU2085546C1 - Method of preparing non-autoclave-hardening cellular-concrete mix and delivery to consumer - Google Patents

Abstract

FIELD: manufacture of building materials. SUBSTANCE: concrete mix designed for use in poured-in-place and block construction is prepared first in hydro-mixer and then in average mixer, wherein foaming is effected by way of pumping the mix through ejector-aerator under pressure with simultaneously introducing a surfactant, whereupon foamed mass is additionally fed into static mixer provided that ejector-aerator and static mixer are disposed before cellular-concrete mix delivery post. EFFECT: improved homogeneity and stability of mix with possibility of transferring it to longer distances in horizontal and vertical directions. 1 dwg

Description

 The invention relates to methods for producing and supplying a non-autoclaved aerated concrete mixture in monolithic and prefabricated construction and can be used to create technologies and technical means for receiving and supplying a concrete mixture.

 Known vibration-vacuum technology of cellular concrete with the use of fillers: tripoli, diatomite, ash, excluding the use of surfactants. The air from the porous filler at a certain differential is extracted from the filler and porous mixture.

 This technology does not allow to obtain cellular concrete mixtures of low density, does not give a homogeneous structure of hardened cement stone / 1 /.

 The closest analogue is a method of preparing a cellular concrete mixture of non-autoclaved hardening / 2 /.

 According to this method, a mortar mixture is prepared by mixing the starting components and mixing them with water, then surfactants are supplied and foamed by mixing and transportation under a pressure of 0.5-3.0 MPa.

 With this method, by simply mixing the solution with a surfactant, it is not possible to obtain a uniform mixture of dispersions of solid particles of cement, water and gas. To obtain finely dispersed systems, significant energy must be applied. The dispersion of all phases determines the stability of foam systems and the strength of the resulting material.

 The aim of the present invention is to improve the quality of the resulting cellular concrete mixture and cellular concrete after hardening the mixture.

 This goal is achieved by the fact that in accordance with the recipe, according to the well-known technology for producing solutions using a hydraulic mixer, prepare the initial two-phase solution (cement + filler).

 This solution is pumped under pressure through a series-mounted ejector-aerator with an open air inlet and a static mixer.

 At the same time, the ejector aerator and the static mixer are installed near the point of delivery (distribution) of the cellular concrete solution to the consumer, and the surfactant is fed to the inlet of the ejector aerator. This allows you to ensure effective aeration of the solution and the normal operation of the ejector-aerator due to the minimum back pressure at the outlet of the ejector-aerator.

 The drawing shows a diagram of the implementation of the method of obtaining and supplying aerated concrete, where 1 hydraulic mixer; 2 connecting capacity; 3 - pump unit; 4 ejector aerator; 5 static mixer; 6 output sleeve.

 Pumping the initial solution sequentially through an ejector-aerator with an open air inlet and a static mixer provides aeration of the solution mixture due to air and multiple mixing of the aerated mixture until a homogeneous three-phase mixture is obtained.

 Moreover, the regulation of the size of the bore of the air hole in the ejector-aerator allows, if necessary, to regulate the degree of aeration of the solution and, thereby, adjust the output density of the solution.

 The use of air ejection in the ejector-aerator allows you to abandon the use of expensive compressors and thereby reduce the cost of obtaining and supplying a cellular concrete mixture.

 The choice of the installation location of the aerator ejector near the point of delivery of the cellular concrete mixture to the consumer allows to reduce the back pressure in the ejector-aerator and thereby improve its working conditions and obtain a high-quality cellular concrete mixture, and the nozzle diameter is selected so as to ensure the necessary air ejection in The ejector-aerator pump unit worked in normal mode, without overloads. This allows you to reduce energy consumption (heat).

 In general, these operations and their sequence ensure the achievement of the goal.

Claims (1)

 A method of obtaining a cellular concrete mixture of non-autoclave hardening and dispensing it to the consumer, comprising preparing a mortar mixture by mixing the starting components and mixing them with water, supplying a surfactant and foaming, characterized in that the mortar mixture is prepared first in a hydro- and then in an averaging mixer, foaming carried out by pumping the mortar mixture under pressure through an ejector-aerator with the simultaneous supply of surfactant into it, after which the resulting foamed mixture is additionally mixed in static esitele, the ejector-aerator and a static mixer placed before post-issuance cellular concrete mix to the consumer.