SU1765135A1 - Composition for production of building articles - Google Patents

Abstract

Use: partition plates, blocks, bricks, etc. The essence of the invention: the composition contains cement dust 35.5- 38.0%, tuff crushed stone 1-2.5%, tuff sand 33-40%, lime 0.5-2%, gypsum 0.5-3%, water 9 -10%, carbonate slurry resulting from cutting carbonate rocks 10-15%. 6 tab.

Description

The invention relates to the building materials industry, namely, to a mixture of raw materials for the manufacture of non-autoclaved building products for laying walls, partition walls, blocks, bricks, and the like.

The known raw material mixture for the manufacture of building materials, including cement dust, slag, gypsum, lime and water, with the following components, wt.%:

Cement dust 20,0-35,0

Slag42.0-59.0

Gypsum 0.5-2.5

Lime 0.5-3.5

Voda15,0-22,0

The known composition has the following disadvantages:

- Low strength

-Great water absorption.

The purpose of the invention is to reduce water absorption and increase strength.

This goal is achieved in that the composition for the manufacture of building products, including cement dust, volcanic rubble and sand, lime,

gypsum and water, in addition, it contains carbonate sludge formed during the cutting of carbonate rocks, in the following ratio of components, wt.%:

Cement dust 35,5-38,0

Tuff crushed stone1.0-2.5

Tuff sand 33,0-40,0

Lime 0.5-2.0

Gypsum 0.5-3.0

Carbonate slime10,0-15,0

Water9.0-10.0

Characteristics of the raw materials: 1. Cement dust in the process of burning clinker in rotary kilns a significant part (20-30%) of the calcined material is carried out from the kilns along with flue gases. The chemical composition of the dust is different from the chemical composition of the raw mix,

As a rule, the carbonate component is to a large extent entrained, the clayey component to a lesser extent, and the least ferrous additive. Thus, cement dust contains free calcium oxide, calcined clay and clinker minerals.

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The chemical composition of the used cement dust (cement factories of the ArmSSR) is shown in Table 1.

2. Tuff is used in the form of rubble (5-10 mm) and sand (0-5 mm), which are waste products from the extraction and processing of natural tuff stone.

The chemical composition of tuff deposits of the Republic of Armenia is shown in Table 2,

The grain composition of tuff sand is shown in Table 3.

As lime, building air lime GOST 9179-70 is used.

As gypsum using gypsum stone GOST 4013-82.

The carbonate slime produced by cutting marble, limestone and travertine is a dispersed mass with a particle size of less than 80 microns.

The chemical composition of carbonate sludge is shown in table 4.

Manufacturing techniques for the production of artificial stone building products are performed in several manufacturing operations:

-Preparation of lime and gypsum from kiln dust

-Dosage of dry to slurry, carbonate sludge, tuff sand and rubble;

- Dry mixing of components;

-Wet mixing components

- Molding of products with a pressure of 25 - 50 MPas

- Steaming of products according to the mode: temperature rise up to 90 ° С - 2 hours, holding at 90 ° С 6 hours, temperature descent - 2 hours (10 hours in total).

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The obtained samples are tested according to GOST 8462-65, GOST 7025-78.

The basic object for comparing the proposed composition is a sample of natural stone - tuff, GOST 9479-84, PCT of the Republic of Armenia 1102-84.

, Specific examples of the proposed composition and test cases for justifying the stated limits of the contents of 10 components are given in Table 5.

The advantages of the proposed structure in comparison with the known are given in table 6.

As can be seen from the data of Table 6, the proposed composition compared to the known composition has several advantages:

- reduced water absorption;

- increase in durability.

Claims (1)

20 claims A composition for the manufacture of building products, including cement dust, volcanic crushed stone and sand, lime, 25 gypsum and water, characterized in that, in order to reduce water absorption and increase strength, it additionally contains carbonate slime formed during cutting carbonate rocks, tuff ground 30 Ben and sand in the following ratio, wt.%: cement dust35.5-38.0 tuff crushed stone1.0-2.5 tuff sand 33,0-40,0 35 lime 0.5-2.0 gypsum 0.5-3.0 water9-10 specified slime10-15. Table 1 table 2 Table 3 55 Table 4  the first figure corresponds to the pressing pressure - 2S NPA; the second figure corresponds to the pressing pressure - 50 NPA Table5