SU893935A1 - Concrete mix - Google Patents

Description

(54) CONCRETE MIXTURE

I

The invention relates to the production of building materials, namely to mixtures for the extrusion molding of products based on gypsum.

A concrete mixture is known that includes cementing, fillers and organic additives 1.

The closest in technical essence and the achieved result is a concrete mix, including gypsum, quartz sand, cellulose derivatives, reinforcing fibers and adhesives of animal origin with the following ingredients, wt.%:

Gypsum 35-65

Quartz sand35-50

Cellulose derivatives 0.2-0.8

Reinforcing fibers

(asbestos, campfire, flax

etc.) 2-8

Adhesives

animal origin up to 15 2.

A disadvantage of the known mixture is the low crack resistance of the products.

2

The purpose of the invention is to increase the crack resistance reducing the cost of production.

This goal is achieved by the fact that a concrete mixture, including gypsum cement, methylcellulose, reinforcing fibers and quartz sand, additionally contains sodium salt of a copolymer of salicylic acid and formaldehyde when following the ratio of components and components, wt.%:

Gypsum per 4747-90

ten

Methyl cellulose 0.3-1.5

Reinforcing Fibers2-40

Sodium salt of copolymer of salicylic acid with formaldehyde 0.05-0.7

15

Quartz sandEverything else

The use of sodium salt of copolymer of salicylic acid and formaldehyde in the indicated ratios makes it possible to increase by 5–10 ° C the gelatinization temperature of methyl cello 20 lyulose introduced into the molding mixture and thereby increase the limiting temperature of the molding, which still provides high-quality products.

Example. A concrete mixture for extrusion molding is prepared as follows. The components of the mixture are thoroughly mixed until homogeneous and mixed with an aqueous solution of the sodium salt of the salicylic acid copolymer.

74.2

47,890

0.7

1.50.3

15

104.65 to

ten

40

0, 050.1

0.7

In tab. 2 shows the properties of the mixture and the finished product.

Thus, the use of the proposed composition improves the quality of the finished products (reduces scrap to 1-2%), expands the range of operating temperatures of the molding, reduces the axial pressure in the extruder and simplifies the process by eliminating the known

240

120

with formaldehyde appropriate concentration. Samples are formed from the prepared mixture and grown to constant weight. In tab. 1 shows the boundary and optimal formulations using various fibrous materials.

Table 1

79,179 71.9

88.64 84.1

0.70.8 0.8 0.960.7

1015 20

210

28.2

ten

0.2 0.3

0.2 0.20.20.20

Additional technological equipment (hot water supply and supply systems and tanks for preparing concentrated solutions of adhesives of animal origin).

In tab. 3 shows the cost of additives in the preparation of molding compounds for the manufacture of products by extrusion.

table 2

JI Q Marriage due to defects on cut products,

Offered

cracks, dragon tooth was at a temperature of the molding mass of 18 ° C to 15%, at 32 ° C - up to 70%.

Claims (2)

TABLE 3 Formula of the Invention Concrete mixture, including gypsum in ground, metal cellulose grains, reinforcing fibers and quartz sand, characterized in that, in order to increase fracture toughness and (cost, production, it also contains sodium copolymer liquefied solimers, and also contains sodium copolymer freemasses. and formaldehyde at the following solubility components, wt.%: Gypsum plastering 47.8-90.0 Methscellulose 0.3-1.5 893935 to Cl. 04 8 Reinforcing fibers 2,0-40,0 Sodium salt of salicylic acid-formaldehyde copolymer 0.05 -0.7 Quartz sandExtra Source nicknames of information taken into account in the examination 1. UK Patent N 1325607, C 03 B 13/28, 08.08.73. 2. The patent of Swiss N 454722, cl. From 04 To 13/14, .06.63 (prototype).