RU2499778C1 - Concrete mixture - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: concrete mixture contains, wt %: slag portland cement 25-30; blast-furnace slag ground until passage through sieve N 20 34-38; andesite flour 35.5-36.3; glass fibre cut to 10-20 mm pieces 0.5-0.7, with water-to-cement ratio of 0.5-0.55.

EFFECT: reduced loss of strength of articles made from the concrete mixture during glazing.

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Description

The invention relates to the building materials industry, in particular, to the production of concrete mixtures for the manufacture of products (plates, wall panels) to be glazed.

Known concrete mixture containing water, nscoportland cement and crushed metallurgical (blast furnace) slag [1]. The loss of strength during glazing of products obtained from such a concrete mixture can reach 31.5%.

The objective of the invention is to reduce the loss of strength of products made from concrete mix, with glazing.

The technical result is achieved by the fact that the concrete mixture containing water, nosoportland cement and crushed blast furnace slag further includes andesitic flour and glass fiber cut into pieces of 10-20 mm in the following ratio of components, wt.%: Slag portland cement 25-30; crushed blast furnace slag 34-38; andesite flour 35.5-36.3; glass fiber cut into segments of 10-20 mm 0.5-0.7, with a water-cement ratio of 0.5-0.55.

The table shows the composition of the concrete mixture.

Table Components Composition, wt.%: one 2 3 Slag Portland Cement thirty 27.5 25 Crushed before passing through the mesh No. 20 blast furnace slag 34 36 38 Andesitic flour 35.5 35.9 36.3 Glass fiber cut into pieces of 10-20 mm 0.5 0.6 0.7 Water cement ratio 0.5 0.52 0.55 The loss of strength of products during glazing,% ~ 20 ~ 20 ~ 20

To prepare the concrete mixture, dry raw materials are prepared, dosed and mixed. Water is added to the dry components and everything is thoroughly mixed. The mixture is placed in metal (pre-lubricated with machine oil) molds and left to solidify. Then the products are removed from the molds and kept at room temperature for at least 28 days. Then the surface of the products is polished, a suspension of low-melting colored glaze (enamel) is applied (sprayed) onto it, which is fixed by fusion in a screen electric furnace at a temperature of 750-800 ° C for 8-12 minutes.

The source of information

1. A.S. No. 627107 USSR, 1978.

Claims (1)

A concrete mixture containing water, slag Portland cement and crushed blast furnace slag, characterized in that it contains blast furnace slag crushed before passing through a mesh No. 20, and further includes andesitic flour and cut into pieces of 10-20 mm glass fiber in the following ratio of components, wt .%:
Portland cement slag 25-30 crushed blast furnace slag before passing through mesh No. 20 34-38 andesitic flour 35.5-36.3 glass fiber cut into pieces of 10-20 mm 0.5-0.7 with water-cement ratio 0.5-0.55