SU1458233A1 - Method of manufacturing variotropic cellular concrete articles - Google Patents

Abstract

The invention relates to the manufacture of building materials and can be used in the manufacture of predominantly cellular-bone-reinforced products. The purpose of the invention is to simplify the process while increasing the surface strength and reducing the passivator consumption. A low-fraction rubble is placed on the bottom of the mold, a layer of the passivator solution is applied, dried, the cellular-concrete mixture is poured, and aging is carried out until the end of the swelling. 1 tab.

Description

one

The invention relates to the building materials industry and can be used in the manufacture of predominantly reinforced cellular concrete products, hakKTepHsyio ierocH with properties varying in the cross section of the product, for example, density.

The purpose of the invention is to simplify the process when pivoting surface strength and reducing the passivator consumption.

The method is carried out as follows.

At the bottom of the cleaned and lubricated forms are placed monofraction crushed stone. A concentrated solution of potassium dichromate with a temperature of 80-90 ° C is prepared in a front bunker, in the lower part of which rotating brushes are fixed and there is a gap.

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with

through which the passivator solution is fed to the brushes. A bunker with a prepared potassium bichromate concentrated solution is fed to the mold, a gap opens, the solution is fed onto rotating brushes that coat the surface of rubble. Then the passivator solution is dried, for example, with a stream of hot air, after which the cellular concrete mixture is poured.

Examples According to the proposed and known methods form samples of the same composition (composition 1 and 2), composition 1, parts.h .: cement 140; ground. sand 300; beat the kettle 100; aluminum powder 0,35; composition 2, parts by weight: cement 140; ground sand 300; lime kettle 100; aluminum pood- .ra 0,45.

The preparation of the form was carried out as follows .:

According to the proposed method. At the bottom of the cleaned and lubricated form, a monolayer of rubble from a pumice fraction of 40-50 mm was packed with a density of 900-1000 kg / m. In a clean beaker, a concentrated potassium bichromate solution (passivator) was prepared. PacTBopobf: covered the surface of rubble, previously laid on the bottom of the form. The remainder of the solution in the glass was determined by the consumption of passive14

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which was 150-200 g

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and a-oa 1458233

ten

the end of the swelling and maturation of the mixture, then the cap was cut, and the samples were autoclaved simultaneously in one autoclave. After autoclaving, the molds were cleared and the image was examined. It has been established that, by a known method in forms, the fabric is charred and is not suitable for reuse. Samples were tested for physical and mechanical characteristics. The test results are shown in the table.

By a known method. The bottom of the mold is a layer of soda, 1 mm thick (the consumption of soda is 1000-1100 g per 1 m). A cotton material impregnated with 10% acetic acid solution was placed on top of the soda (acetic acid consumption per 2.5 m is 2.5-3 l). Immediately after the cotton material soaked with acetic acid was placed on the soda layer, an intensive gas gassing was observed.

In the prepared form was poured aerated concrete mixture, kept until

Density of the non-sealed part of the sample section, kg / m

Strength of the non-compacted part of the section

The structure of the dense layer of concrete

The quality of a dense layer of concrete No sinks

15 form

la invention

0

five

A method for manufacturing variotropic cellular-concrete products, including the introduction of a passivator and pouring the cheyto-concrete mixture into a mold, characterized in that, in order to simplify the process while increasing surface strength and reducing the passivator consumption, rubble is first placed on the bottom of the mold treated with a passivator solution, dried, and after that, the cellular concrete mixture is poured into the mold.

641

-674

650

Variable density

There are separate gas sinks:

1052946

1514

0,0140,016

959

970

10.5

ten

0.016

0.016

Claims (1)

15 F rula invention A method of manufacturing variatropic cellular-betonite products, including the introduction of a passivator and pouring a mesh-concrete mixture into a mold, which consists in that, in order to simplify the process while increasing surface strength and reducing the passivator consumption, crushed stone is first laid on the bottom of mold 25 , then its surface is treated with a solution of a passivator, dried and after that | go in the form poured concrete mixture. Indicators The proposed method Known method Composition 1 Composition 2 Composition 1 Composition 2 The density of the uncompressed part of the cross section of the sample, kg / m ^e 669 641 674 650 The strength of the unconsolidated part of the cross section of the sample, MPa 4.8 4.6 4.9 4.2. Thickness of a dense concrete layer, mm 55 45 35 45 Dense concrete structure Variable density The quality of the dense layer of concrete · No sinks Separate gas 'sinks' observed 5 1458233. • i * 6 Table continuation Indicators The proposed method Known method Composition 1 | Composition 2 Composition 1 | Composition 2 '' Average density in the lower concrete layer, kg / m ⁵ 1052 946 959 970 The strength of the dense layer of concrete, MPa fifteen fourteen 10.5 10 The vapor permeability coefficient of a dense concrete layer, 30 mm thick, g / m, h / mm, Hg 0.014 0.016 0.016 0.016