SU1052492A1 - Composition for making construction products - Google Patents

Abstract

COMPOSITION FOR CONSTRUCTION PRODUCTS: containing ground gypsum km4, additive and water, so that, in order to increase the strength, it holds, as an additive, co; oxide: magnesium with The following is the ratio of iCapons, Mac.% f. Ground stone gypsum88-95 Magnesium Oxide 0.05-1.0 Water Else

Description

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This invention relates to compositions for producing gypsum-based products and can be used in industrial and civil construction.

A composition based on dihydrate ground gypsum, an addition of potassium sulphate and water is known. From the resulting composition molded product and dried C1J.

The disadvantages of this composition are the need to dry the products and the low final strength.

The closest to the technical essence and the achieved effect to the proposed is a composite, including: finely ground two-water gypsum, the addition of Urea-formaldehyde resin and water. From this, the compositions press the products at pressures of 30 MPa, the strength of the products after closure, 15–20–20.2 MPa C2.

Disadvantage: such a composition is in a n. Low-strength product based on it.

The purpose of the invention is to increase the efficiency.

The delivered grain is achieved because the final position for the production of construction products, including ground gypsum, additive and water, contains magnesium oxide as an additive in the following ratio of components, wt,%:

Ground gypsum stone

88-95 0.05-1.0.

Magnesium oxide

Water Rest

In the manufacture of gypsum samples, the gypsum stone of the Krasnor deposit with a Ca5O – 2H2O content of 83 wt.% Is used. The fineness of the gypsum stone residue on sieve number 008 - 16 wt.%. Gypsum stone grinding is performed in a ball mill at a mass ratio of 1: 3 comminuted material and balls. Samples were molded on a hydraulic press.

Samples were made - cylinders of 4 compositions, including, May. %:

Ground gypsum stone 88; 90, N 92/95

Magnesium Oxide 0.05; 0.1, 0.5; one.

Water content up to 100%

Samples are molded under a pressure of 30 MPa and tested after 24 hours of air hardening. The test results are shown in table 1. Table 1,

The highest compressive strength is .composition containing .0.1 wt.%. The optimal composition for the preparation of gypsum products is May; .%: Ground plaster. stone 92 M fOOJ1 WaterExtra Gypsum products based on this composition have a strength of 280 kgf / cm ..; -..-; .

0.1 7.9

92

31

28 30

W: 5

33 From a mixture containing, in May.%: Two-water t gypsum92, 1 WaterExtrous Mold samples at a pressure of 30 MPa, which harden under normal conditions for 1,3,7,14, 21 days. Samples tested for compression, the test results are given in table.2. . Table 2

As can be seen from table 2 to 21 days of hardening, the strength of the samples based on the proposed composition is stabilized. .

Gypsum products from the proposed composition have a strength higher than that of the prototype, low moisture, I have, t a sufficient durability, and are characterized by low adhesion to the metal.

When drying products based on the proposed composition at 50-55 ° C to a constant mass, dur-.

Their value increases by 20-25% and is 35-40 MPa, which is 40% higher than that of the prototype.

The use of the proposed composition in the construction industry will affect the strength of gypsum products, such as tiles, wall panels and partitions, increases their carrying capacity and improves appearance. The use of products based on this composition drastically reduces power consumption, since high strength is achieved without a drying operation.

Claims (1)

COMPOSITION FOR PRODUCTION OF CONSTRUCTION PRODUCTS, containing ground gypsum stone, additive and water, different from that. That, in order to increase strength, it contains magnesium oxide as an additive in the following ratio of components, wt.% J. Ground gypsum stone 88-95 Magnesium Oxide 0.05-1.0 Water Else SI N3 4 * SO y