SU457677A1 - A method of manufacturing aerated concrete products - Google Patents

Description

one

The invention relates to the building materials industry and can be used by cellular concrete plants.

There is a method of forming aerated concrete products, in which the mixed raw material mixture is poured into a mold and held until expansion. Moreover, in order to maximize the volumetric weight of aerated concrete, the consumption of the gasifier and water is increased.

This method, however, determines the limit for reducing the bulk weight of aerated concrete. After a certain limit, an increase in the flow rate of the gasifier (aluminum powder) becomes ineffective because it does not fully react due to a lack of water mixture (water is also consumed in the gassing reaction and is sucked off by increasing its inner surface of the gas cells, and the higher the porosity is, the more required water flow). However, the introduction of a large amount of water into the raw material mixture reduces the initial gas-holding capacity of the mixture. The formation of a gas in a very liquid mixture causes gas bubbles to float, preventing the expansion process.

The purpose of the invention is to reduce the bulk weight of aerated concrete.

This is achieved by introducing water in an amount of 5-30% by weight of the mixing water into the mixture poured into the mold during the expansion process. Water may be introduced through the holes in the mold or by irrigation. In addition, dispersed fillers, such as ground chalk, may be added to the water.

The concrete mixture is prepared in a known manner with the optimum amount of water determined by calculation or experiment, the mixture is poured into a mold and maintained until the beginning of expansion.

After the mixture is expanded by at least 20–40%, an additional amount of water (5–30% of the previously injected) is introduced into the aerated concrete mixture, which can be introduced through the holes in the mold or by applying it, for example, sprays to the open surface. her mixture.

After partial expansion of the initial aerated concrete mixture, part of the mixing water will already be bound (adsorption of water to the newly opened inner surface of the cells and chemical reactions of the gasifier), and therefore introduced additional portions of water will not lead to unacceptable dilution of the mixture.

If water is applied to the surface of the mixture, it is possible to obtain an additional effect — blocking the surface pores and preventing gas losses. To do this, dispersed aggregate, for example ground chalk, is added to the additionally added water.

The proposed method was tested in laboratory and working conditions and showed positive results: the volume weight of aerated concrete was reduced by 10-20%.

Subject invention

Claims (4)

1. A method of manufacturing aerated concrete products by watering the aerated concrete mixture, pouring it into the mold and swelling, characterized in that, in order to reduce the volumetric weight of the aerated concrete, in the process of swelling, the amount of 5-30% by weight water shutter. 2. A method according to claim 1, characterized in that water is introduced through the holes in the mold. 3. A method according to claim 1, characterized in that water is introduced by irrigating the surface of the product. 4. Method according to paragraphs. 1, 3, characterized in that a dispersed filler, for example ground chalk, is added to water.