RU2415098C1 - Gypsum mixture - Google Patents

Abstract

FIELD: chemistry. ^ SUBSTANCE: invention relates to a gypsum mixture and can be used in the construction industry to make various articles, for example blocks and slabs. The gypsum mixture contains the following in wt %: gypsum hemihydrate 28-30, slaked lime 1.2-1.5, portland cement 0.3-0.5, quartz sand with grain size of up to 0.8 mm 41.97-47.95, water 20-23, zinc sulphate 0.03-0.05, mullite-silica wool 2.5-3. ^ EFFECT: high strength. ^ 1 tbl

Description

The invention relates to the production of building materials based on a gypsum binder.

Known gypsum mixture, including, wt.%: Semi-aquatic gypsum 28-30; slaked lime 1.2-1.5; Portland cement 0.9-1.3; silica sand with a grain size of up to 0.8 mm 28-50; table salt 0.06-0.08; water 20-23 [1]. The compressive strength of products obtained from such a gypsum mixture is 20-22 MPa.

The objective of the invention is to increase the strength of products obtained from gypsum mixtures.

The technical result is achieved in that the gypsum mixture, including semi-aquatic gypsum, slaked lime, Portland cement, silica sand with grain sizes up to 0.8 mm, water, further includes zinc sulfate and mullite-siliceous wool in the following ratio, wt.%: Semi-aquatic zinc 28 -thirty; slaked lime 1.2-1.5; Portland cement 0.3-0.5; silica sand with a grain size of up to 0.8 mm 41.97-47.95; water 20-23; zinc sulfate 0.03-0.05; mullite-siliceous wool 2.5-3.

The table shows the compositions of the gypsum mixture.

Table Mixture components Content, wt.%, In the compositions one 2 semi-aquatic gypsum 28 thirty slaked lime 1,2 1,5 Portland cement 0.3 0.5 quartz sand 47.95 41.97 water twenty 23 zinc sulfate 0.05 0,03 mullite-siliceous wool 2.5 3 Compressive strength, MPa ~ 25 ~ 25

Mullite-siliceous wool with an average density of ~ 80 kg / m ^{3 is} used in the composition of the raw material mixture for the manufacture of the heat-insulating layer, the raw material for the production of which is technical alumina and quartz sand. For inclusion in the composition of the mixture, the cotton wool is preliminarily subjected to cracking, cut into lengths of 10-20 mm.

The components of the mixture are dosed in the required quantities. Zinc sulfate is dissolved in water. Dry components (semi-aquatic gypsum, slaked lime, Portland cement, quartz sand with grain sizes up to 0.8 mm, mullite-siliceous cotton wool) are mixed, shut with water and zinc sulfate dissolved in it, and mixed again. The resulting mixture is poured into molds. After 20-25 minutes after pouring the product is removed from the molds and kept at room temperature for 1 day.

A variety of products can be obtained from the proposed gypsum mixture: blocks, plates, sculpture, etc.

Information sources

1. Vorobyov H.S. Plaster binders and products (Foreign experience). - M .: Stroyizdat, 1983. - P.181.

Claims (1)

Gypsum mixture, including semi-aquatic gypsum, slaked lime, Portland cement, quartz sand with grain sizes up to 0.8 mm, water, characterized in that it further includes zinc sulfate and mullite-siliceous wool in the following ratio, wt.%:
semi-aquatic gypsum 28-30 slaked lime 1.2-1.5 Portland cement 0.3-0.5 quartz sand with a size grains up to 0.8 mm 41.97-47.95 water 20-23 zinc sulfate 0.03-0.05 mullite-siliceous wool 2.5-3