SU1426959A1 - Method of producing lightweight gypsum articles - Google Patents

Abstract

This invention relates to technologies for local building materials and can be used in the manufacture of building products and structures from gypsum to a binder. The purpose of the invention is the reduction of the setting time and shortening; the improvement of the consumption of the additive, while maintaining the st The manufacturing method involves the preparation of an aqueous solution of an additive of sulphate salts by dissolving in 100 May. h heated to boiling water 25-100 May. including iron sulfate or aluminum sulfate,. of their double salts with potassium, or ammonium, and 10–50 May. including concentrated sulfuric acid, mixing the resulting solution with mixing water in a ratio of 1: 100-4000 and gypsum in a 0.4 to 2.5 ratio of water-solid. The setting time for the binder is reduced by a factor of 2, while the amount of the additive is reduced by a factor of 10. 1 tab.

Description

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The invention relates to the technology of local building materials and can be used in the manufacture of building products) and structures of gypsum in the ghost.

The purpose of the invention is to reduce the setting time and reduce the consumption of the additive while maintaining strength. The method is carried out as follows.

An accelerator additive based on sulfate salts is preliminarily prepared by dissolving in 100 May. h. boiling water of predetermined amounts of salt and concentration of sulfuric acid bath. The resulting solution is poured into a measured amount of mixing water and mixed. The water of the displacement with the solution of the additive in it is mixed with the gypsum in the water in the required water-solid ratio, the mass is mixed, molded products and material.

As sulfate salts, ferrous sulfate of ferrous oxide or eighteen-aluminum sulphate of aluminum, or twelve-abundant aluminum-ammonium (potassium alumina) alum, or twelve-ferric ammonium (iron oxide) alum can be used. When dissolved in boiling water in the presence of cepHovi acid, it is dehydrated to form myhydrates, which add sulfuric acid molecules. The complex salts of these metals of the type ReZo-HjO-H2SO4, including sulfuric acid molecules and one water molecule, thus obtained, when gypsum is added to the mixing water and when preparing the dough from gypsum, act catalytically on the crystallization of calcium sulfate. This allows the water-hard OTHOUjenne gypsum dough to be in the range of 0.4-2.5 at high setting speeds. The decrease in the volumetric weight of products occurs due to capillary crystallization, which gives a non-shrink dispersed structure of needles of two-water calcium sulfate crystals. Such a structure provides in turn high product strength. . The results of the testing of gypsum products made by the proposed method with various additives - accelerators

are listed in the table.

Comparative tests show that when using the proposed method (as compared with the known ones), the setting time is reduced by a factor of 1.5-2.

gypsum-tidal while reducing the consumption of sulfate additives by 10 times and maintaining high strength properties of products ..

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Claims (1)

Invention Formula A method of making light gypsum products, which includes dissolving an accelerating agent from the group: ferrous sulfate, aluminum sulfate, alkali potassium alum, iron ammonium alum, iron alum, aluminum ammonium alum, in sulfuric acid, mixing the resulting solution with water and gypsum in the ghost, characterized by that, in order to reduce the setting time and reduce the consumption of the additive while maintaining strength, 25-100 May. including the specified accelerator is dissolved in 100 May. including water heated to boiling, and 10-50 May. h. concentrated sulfuric acid and the resulting solution are mixed with mixing water in a ratio of 1: 100-4000 and gypsum in a water-solid ratio of 0.4-2.5.