RU2439034C1 - Concrete mixture - Google Patents

Abstract

FIELD: chemistry. ^ SUBSTANCE: invention relates to concrete mixture and can be used in the industry of construction materials, particularly in production of light concrete wall blocks. The concrete mixture contains the following in wt %: portland cement 28.0-32.0; ash-slag filler 36.0-40.0; gas-expanded plastic crumbs with particle size of up to 10 mm 3.0-4.0; foaming agent Unipor 0.8-0.9; water - the rest. ^ EFFECT: low bulk density of concrete while maintaining its strength. ^ 1 tbl

Description

The invention relates to the building materials industry, in particular to the production of lightweight concrete wall blocks.

Known concrete mixture containing, by weight: portland cement 1.0; ash and slag filler 3.6-9.7; crumbs of gas-filled plastic (polyethylene foam) with a particle size of up to 10 mm 0.024-0.009; water 0.6-1.1 [1].

The objective of the invention is to reduce the bulk density of concrete.

The technical result is achieved by the fact that the concrete mixture containing Portland cement, ash and slag filler, gas-filled plastic chips with a particle size of up to 10 mm, water, additionally includes Unipor foaming agent in the following ratio of components, wt.%: Portland cement 28.0-32.0 ; ash and slag filler 36.0-40.0; gas-filled plastic crumb 3.0-4.0; Foaming agent “Unipor” 0.8-0.9; water is the rest.

Ash and slag filler is characterized by chemical composition, wt.%: SiO ₂ 40,7; Al ₂ O ₃ 15.8; Fe ₂ O ₃ 13.5; CaO 8.9; MgO 4.3; Na ₂ O + K ₂ O 3.8; SO ₃ 1,4; p.p.p. 8.5. The granulometric composition of the ash and ash filler is as follows, wt.%: Particles larger than 0.63 mm — 0.2; larger than 0.315 mm, but smaller than 0.63 mm, 4.8; larger than 0.14 mm, but smaller than 0.315 mm - 62; smaller than 0.14 mm - 33.

For the preparation of concrete mixtures, crumbs of any gas-filled plastic are used. To obtain crumbs, waste polystyrene foam, polyethylene foam, etc. (scraps, defective or old products) are crushed to obtain particles up to 10 mm in size. Such particles have an uneven rough surface, which as part of the concrete mixture improves their adhesion to cement stone.

The Unipor foaming agent is a protein-based foam concentrate, a chemical neutral product that does not contain chlorides (dark brown liquid).

Examples of concrete mixes are given in table 1.

Table 1 Components Content, wt.%: composition No. 1 composition No. 2 composition No. 3 Portland cement 28.0 30,0 32,0 Ash and slag filler 36.0 38,0 40,0 Gas-filled plastic 3.0 3,5 4.0 Foaming agent "Unipor" 0.9 0.85 0.8 Water the rest is 32.1 the rest is 27.65 the rest is 23.2

To prepare the concrete mixture, the raw materials are prepared: Portland cement, ash and slag filler, drinking water, gas-filled plastic chips, Unipor foaming agent. The ash and slag filler is mixed with Portland cement, the foam prepared from water and Unipor frother is added, and a gas-filled plastic crumb is introduced with stirring. The resulting concrete mixture is placed in metal (pre-lubricated with machine oil) molds and kept in them until cured. Then the products are removed from the molds and transported to the finished goods warehouse, where they are kept at room temperature for at least 28 days.

Products obtained from the proposed concrete mixture have a low bulk weight (10-15% less than products made from concrete mixture [1]) and can be used in the construction of storage facilities, garages, fences and other.

The strength of the products, despite the decrease in bulk density, remains unchanged.

Information sources

1. RF patent №2083523, С04В 28/04, 1997.

Claims (1)

Concrete mixture containing Portland cement, ash and slag filler, gas-filled plastic chips with a particle size of up to 10 mm, water, characterized in that it additionally includes Unipor foaming agent in the following ratio of components, wt.%:
Portland cement 28.0-32.0 ash and slag filler 36.0-40.0 gas-filled plastic crumb 3.0-4.0 Foaming agent “Unipor” 0.8-0.9 water rest