RU2496734C1 - Concrete mixture - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: invention relates to a concrete mixture and can be used in the industry of construction materials, particularly in production of concrete wall blocks. The concrete mixture contains the following, wt %: portland cement 25.0-27.0; ash-slag filler 32.75-40.8; urea 0.2-0.25; cement clinker ground and sieved through sieve No5 9.0-13.0; water 25.0-27.0.

EFFECT: high frost resistance of concrete.

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Description

The invention relates to the building materials industry, in particular the production of 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 increase the frost resistance of concrete.

The technical result is achieved by the fact that the concrete mixture containing Portland cement, ash and slag filler, water, additionally includes urea and crushed and sieved cement clinker through mesh No. 5 in the following ratio of components, wt.%: Portland cement 25.0-27.0; ash and slag filler 32.75-40.8; urea 0.2-0.25; cement clinker 9.0-13.0 crushed and sifted through mesh No. 5; water 25.0-27.0.

The compositions of the concrete mixture are shown in the table.

Table Components Content, wt.%: composition No. 1 composition No. 2 composition No. 3 Portland cement 25.0 26.0 27.0 Ash and slag filler 40.8 36.77 32.75 Urea 0.2 0.23 0.25 Cement clinker crushed and sifted through mesh No. 5 9.0 11.0 13.0 Water 25.0 26.0 27.0 Frost resistance cycles ~ 80 ~ 80 ~ 80

To prepare the concrete mixture, the raw materials are prepared and dosed: Portland cement (grade 400), ash and slag filler, crushed and sieved through mesh No. 5, cement clinker, urea, water. The components are mixed. The resulting concrete mixture is placed in metal (pre-lubricated with machine oil) molds and fed to heat-moisture treatment. Then the products are removed from the molds and transported to the finished goods warehouse. The compressive strength of concrete at the age of 28 days will be at least 15 MPa.

Information sources

1. Patent No. 2083523 of the Russian Federation, С04В 28/04, 1997.

Claims (1)

A concrete mixture containing Portland cement, ash and slag filler, water, characterized in that it further includes urea and crushed and sieved cement clinker through mesh No. 5 in the following ratio of components, wt.%:
Portland cement 25.0-27.0 ash and slag filler 32.75-40.8 urea 0.2-0.25 crushed and sifted through mesh No. 5 cement clinker 9.0-13.0 water 25.0-27.0