SU1698229A1 - Method of producing mortar for manufacturing porous products - Google Patents

Abstract

The invention relates to the production of building materials and can be used in the manufacture of porous materials. The purpose of the invention is to reduce the moisture content and improve the workability of mortars by increasing the density and stiffness of the foam. To do this, when obtaining a gypsum mortar to obtain porous products, an aqueous solution of the foaming agent is divided into at least three parts, which are autonomously dispersed with air before the formation of foams with air bubble sizes of 500-700, 110-170, 25-50 microns after which the foams are mixed in a ratio of 1: (0.3-0.6) :( 0.2-0.4), respectively. 2 tab. s Ј

Description

The invention relates to a technology used in the building materials industry and can be used in the manufacture of porous materials, in particular, foamed gypsum.

The purpose of the invention is to reduce the moisture content and improve the workability of mortars by increasing the density and stiffness of the foam.

The method is carried out as follows.

Pre-prepare 1.5-2.5% aqueous solution of the foaming agent, divided it into three parts, each of which is autonomously treated to obtain foams with

sizes of air bubbles are 500-700, 110-170 and 25-50 microns.

Table 1 shows the compositions of the foaming agents and the operating conditions of the foam generators, at which the foams of the required dispersions can be obtained.

In examples of a specific embodiment of the method, foams prepared from a foaming agent, both on the basis of a surfactant Cascade, and others, are used to prepare foam-gypsum solutions.

Construction gypsum of the G-5 grade of the Novomoskovsk gypsum combine and high-strength gypsum of the G-13 grade PO of the mineral fertilizer are used as the suspect.

ON O 00 S 1CHE S

Of these, those living in the pre-prepared gypsum slurry with a water-gypsum factor of 0.55 for gypsum grade G-5 and 0.37 for gypsum grade G-13.

The gypsum slurry is mixed with foam and the proposed foam-plaster solution is obtained, which is compared with the known.

From the resulting foam-gypsum solution molded samples - cubes with a size of 7 cm and experience by standard methods.

Table 2 shows the composition of the foam-gypsum solution and the indicators of the properties of the foam-gypsum samples.

From table 2 it follows that the humidity of the proposed samples in comparison with the known decreases by 14-27%. This allows, in turn, to reduce energy consumption by 10–12% when drying products and, in a number of cases, by 20–25% construction time. Improving workability by 40-60% helps reduce labor costs by 30-40% in the manufacture of products.

Thus, the proposed method of preparing foamed gypsum makes it possible to obtain a structure of gypsum stone with a more dense packing of air pores and a minimum thickness of water films.

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providing optimum rheological properties of foamed gypsum and its low humidity.

Air bubbles are distributed evenly throughout the volume of the casting, allowing interpore septums to form a regular rigid frame. All this ensures the production of low-quality foamed gypsum and improved workability.

Claims (1)

Invention Formula A method for producing a mortar for producing a porous material, comprising preparing a foam, an aqueous suspension of gypsum in a binder, metering and mixing the foam and a suspension, characterized in that In order to reduce the humidity and improve the workability of the building solutions by increasing the density and rigidity of the foam, foam preparation is carried out by dividing the aqueous solution of the frother into parts that are autonomously dispersed with air until air bubbles form 500-700, 110-170, 25-50 um after which the foam is mixed in a ratio of 1: (0.3-0.6) :( 0.2-0.4). Table 1 Table j