SU948939A1 - Composition for making gas gypsum - Google Patents

Description

(5) COMPOSITION FOR MAKING GAS GIPS

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The invention relates to the production of building materials, namely, structural heat insulating gas gypsum, which is used to produce gypsum boards, panels, plates, blocks and other products.

Known mixtures for the manufacture of gas-gypsum, including gypsum in cement, carbonate and acid additives and water l.

The closest in technical essence and achievable result is a composition comprising semi-aquatic gypsum, alkaline water, water and a blowing agent 2.

A disadvantage of the known composition is an increase in flexural strength.

This goal is achieved in that the composition for the manufacture of gas gypsum, including semi-aquatic gypsum, alkaline water, water, and gas-forming. zovatel, as a gasifier

contains sulfuric acid concentrated in the following ratio of components, wt.%:

Semi-aquatic gypsum 60-66

Malady

melt 0.3-0.7

Sulfuric acid

concentrated - 0.1-0.3

on

WaterEverything

ten

Soda-alkaline melt contains: MazrOz 70-72; CaCO, ia-12; K. Oz7-9 and NaOH 3-8. When water mixes, the mixture of hemihydrate gypsum, alkaline water and sulfuric acid concentrated as a result of the interaction between acid and carbonate additives produces carbon dioxide, which porizes the gypsum dough.

20

At the same time, due to the interaction of the acid additive with carbonate impurities contained in

the original semi-aquatic gypsum, the latter is enriched. In order to strengthen and stabilize the porous structure of the material (2-2.5 times), 0.2-0.5% of glass fiber and 0.1-0.2% of cellulose derivatives (methylcellulose, carboxymethylcellulose, etc.) should be introduced into the MOWHO mixture. To obtain a mixture, three ingredients are prepared containing, weight L: semi-aquatic gypsum 63, alkaline water 0.5 and different content of concentrated sulfuric acid from each other, equal to each composition, respectively (in weight percentages 0.1: 0.2 and 0.3, as well as the water content, constituting an additional up to, 100 parts in each composition, respectively 36, A 36.3, 36.2.

Semi-aquatic gypsum is mixed with alkaline water and concentrated sulfuric acid. The resulting mixture is sealed with water. The fluidity of the mixture according to Suttard's viscometer is 12-14 cm. After homogenization of the mixture for 40-60 s, it is poured into molds.

The resulting compositions have the following physico-mechanical properties (see table 1).

Higher physicomechanical properties of gas gypsum allow for 940

33

16 690 420

7

west800

13.1 500

5.2

2.8 300

to produce better construction products with a reduced bulk weight (see tab.2).

The use of concentrated sulfuric acid as an acid additive may make it possible to mix it in advance with the dry components of the molding composition and store or transport it for a long time before mixing with water. Mixing concentrated sulfuric acid with dry components allows the mixture to be thoroughly homogenized without reacting with gas-forming additives, which significantly improves the quality of the gas-gypsum structure. The material is obtained with small evenly distributed pores throughout the volume.

The manufacturing process of the proposed gas-gypsum mixture is simple and consists in mixing semi-aqueous gypsum, alkaline water and concentrated sulfuric acid, followed by mixing the resulting homogeneous mixture with water.

The proposed composition can be used for the production of hypoboard sheets, wall and wall tiles, and other building products used in residential and civil construction.

Table 1

6

ten,

7

18.1

11.1

26, 2

19.6

Claims (2)

1. USSR author's certificate number 626068, cl. C O B 11/09, AOR.7.71 2. USSR Author's Certificate No. 655672, cl. S O B 11/09, 05.O.7 $.