SU846519A1 - Cellular-concrete mix - Google Patents

Description

one

The invention relates to the composition of cellular concretes based on gypsum cement and can be applied in the manufacture of building materials for the manufacture of lightweight structures and thermal insulation products.

A chetobethoic mixture is known, including plaster in the grist, swelling of additives, for example sulfuric acid with dolomite 1,

The disadvantage of this mixture is its low strength, low water resistance and the need for special precautions in connection with the use of concentrated sulfuric acid.

The closest to the technical essence and the achieved result to the proposed is a concrete mix 2, comprising as an intumescent monocalcium phosphate in the following ratio of components, wt.%:

Gypsum: sticking 57-75 Mo1T9Calcium phosphate 1.0-2.5 WaterOstal

The disadvantage of this concrete mix is the large consumption of gypsum concrete and low water resistance of concrete.

The purpose of the invention is to increase the water resistance of concrete and reduce the consumption of a concrete.

This goal is achieved by the fact that a cellular concrete mixture, including gypsum permeate, monoccurs phosphate and water, additionally contains waste products of aluminum fluoride at the following ratio of components, wt.%:

Gypsum per serving 45.5-61 Monocalcium phosphate 1-2 Waste production of aluminum fluoride 5-13,6

15 Water Remaining

The preparation of the raw material mixture is carried out in the usual manner, by weighing and combining the components together, first in a dry,

20 then in a moistened state. From, the production of aluminum fluoride is a silica gel of the following chemical composition, wt.%: SiOa. 68-87.5; loss during ignition 25–19.7} fluoride compounds 2–9 (recalculated to AvR); CaO 0.20, 5; 0.1, They have a high dispersion and do not require grinding. For the preparation of raw mixes, they are used dried at

thirty

And sifted through a sieve 0063. The molding of the products is carried out by casting into metal molds with a cell size, for example, 10x10x10 cm. The compressive strength of the samples is determined after 28 days of holding in the state of atmospheric humidity. The bulk density is determined on samples dried at constant mass.

Example 1 For the preparation of the raw mix, the main components are gypsum building and waste aluminum fats, obtained from the Kedijk Chemical Plant (Lit. SSR) of chemical composition, wt%: SlOij 37.5; loss on ignition 10.96t A & Fj 4.80; CaO 0.2. The components of the raw mix are used in the following ratios, wt%:

Gypsum building 47 Waste of production of aluminum fluoride Monocalcium phosphate 2 Water39

This composition has the following physical and mechanical properties.

Start of seizure, min. End of skhvavavan, min. Strength of specimens at the age of 28 days

The bulk density in the dried to constant weight state is 743 kg / m. Coefficient of diffusion 0.60.

The compositions of other initial mixtures and physicomechanical characteristics of gypsum cellular concrete are given in Table. 1. According to the data obtained, the introduction of industrial waste into gypsum-cellular concrete raw mixes ensures gypsum saving by about 20%. Along with these products, the quality of the products improves: the water resistance increases (softening coefficient is 0.60, which is mushrooming to the water resistance of silicate concretes), the mechanical strength of the specimens in compression (up to 55 kg / cm) with a bulk weight not exceeding 740 is ensured. 770 kg / m. This is evident from the results of mixtures No. 6-8 and 11 (Table 1). The data obtained show that it is advisable to enter from 5 to 13.6% of production wastes into the initial gypsum cell mixtures. A decrease in the amount of this waste (a mixture of .10), as well as an increase (a mixture of 9 and 3) causes a significant drop in the mechanical

Claims (2)

An advantage of the invention is the use of wastes from the production of fluoride (AlK) Mini, which ensures a reduction in consumption and improvement in the quality of concrete. In connection with the saving of gypsum with a decrease in the bulk weight of the products, the cost of the products decreases by approximately 40-50%. The quality of the products is greatly improved by increasing the water resistance of the products, which is caused by the introduction of silica-based waste into gypsum concrete. The use of the aforementioned wastes expands the raw material base, determining the scope of use for wastes that have not been used anywhere in the world before. This to a large extent also concerns the environmental issue of contamination with fluorine-containing chemicals and makes a great contribution to the cause of waste-free production. In the process of making the mixture, the use of waste products does not represent a danger to the health of workers, since the impurities contained in the solid form, mainly alumina and calcium, are inert, volatile, and volatile. Claim cell mixture comprising gypsum sticking, monocalcium phosphate and water, characterized in that, in order to improve the water resistance of concrete and reduce the consumption of stubble, it additionally contains aluminum fluoride production waste at the following ratio of components, wt.%: Gypsum in Paid 45.5-61 Monok alciyfss Fat 1-2 Waste production of 5-13 / 6 aluminum fluoride Water Ostaliyu Sources of information taken into account during the examination 1. Nagibin G.V. and others. Technologists of heat insulating and gypsum materials. M. / 1973, p. 136. 2. Authors certificate of the USSR 585135, cl. From 04 To 11/09, 1976.