SU1001634A1 - Refractory binder - Google Patents

Abstract

REFRACTORY BINDING, including perlite, soluble glass and technical alumina, characterized in that, in order to increase the strength and heat resistance of concrete based on it, the stinger additionally contains chamotte fractions of 0.25 mm in the following ratio of components, percent by weight: Perlite 22- 30 Soluble glass 5-8 Technical alumina 27-37 Shamot fraction of 0.25 mm25-46

Description

Od

oo 4 The invention relates to construction materials and can be used in the manufacture of predominantly refractory and heat-resistant, as well as acid-resistant concretes. There are known refractory concrete mixes in the composition of concrete, including soluble glass 30-35 wt.% And alumo-calcium slag 25-30 wt.%. The technical essence and the achieved result is the closest to the proposed one, which is used in the manufacture of refractory concrete on chamotte filler, including ground perlite, soluble glass and ground alumina at a weight ratio of 6.5-15: 0.15 - 1,8: 6,5 - 15. Known suspending has insufficient strength properties. The aim of the invention is to increase the strength and heat resistance of concrete on the basis of proposed resident. The goal is achieved by the fact that Common perlite, soluble glass and technical alumina additionally contains chamotte of fraction O, 25 mm in the following ratio of components, wt.%: Perlite Soluble glass Technical alumina chamotte of fraction 0.25 mm Additional introduction of chamotte fraction less than 0.25 mm into the composition containing perlite, soluble glass and technical alumina, provides an active chemical interaction of all components, the result of which is the growth of mullite crystals and a higher degree of crystallinity of alkaline hydroaluminosilicate in a different composition. Grinding the original fireclay to a 0.25 mm fraction used yields particles less than 80 MKMj in size that are chemically active and contribute to hard-to-live fragments of mullite crystals. Particles with a size of 0.08–0.25 mm in Dunner, in a matter of course, play the role of a chemically active microfiller during autoclave treatment. In concretes without the addition of chamotte of the proposed fraction, during firing, large glassy phases are formed, in which the alumina dissociates well, and the crystalline phase, mullite, is not formed. The presence of grit particles less than 0.25 mm hinders the free dissociation of linozem into the vitreous phase by creating microvolumes with a degree of alumina necessary for the crystallization of mullite. The high degree of mullitization in the grist provides concrete with increased strength and heat resistance both after autoclaving and during operation at high temperatures. Introduction to chamotte in an amount less than 25% does not provide a sufficient degree of mullitization, and in greater than 46% leads to a decrease in strength due to a decrease in the proportion of the more active component in the agent, perlite. The technology for the manufacture of refractory concretes based on the proposed tamper agent is as follows: a mixture of ground perlite, technical alumina and chamotte of a fraction of 0.25 mm is prepared at the suggested ratio of components; aggregates are introduced into the dry mixture; the resulting mixture is closed with soluble glass with a density of 1.05-1.20; products are molded from the mixture and subjected to autoclave treatment, after which the products can be installed directly into heat units for operation. .Example. In the described manner, samples are prepared into the perishing with the addition of chamotte of the proposed fraction (1) and concrete samples on the basis of the proposed one (2-4) and the known, adopted for the prototype, (5). In this work, perlite from the Aragats deposit is used, ground to a specific surface of 4000-5000. Samples are subjected to standard strength tests before and after firing, and concrete samples are tested for heat resistance and strength. The compositions of the mixture and the test results are given in table. 1 and 2. As can be seen from the table. 2, the use of the proposed binder allows to increase the strength of concrete (after

autoclave treatment and after firing). The heat resistance of concrete will also increase by 30 heat cycles after autoclave treatment and by 20 after calcination.

Cost effectiveness is CLARED to improve performance and lengthen time. exploitation of concrete 1.5-2 times.

Table 1

Ground perlite 26,722,026,7

Soluble steklo6,75,06,7

Technical Alumina 33,327,033.3

Fireclay fraction to 0.25 mm33,346.033.3

The content of coarse aggregate (chamotte) in concrete,% by mass, of

.Durability at compression, MPA

after autoclave

71.2 treatments

after roasting at 1250 ° С 61.5

Heat resistance of refractory concrete (, water), the number of heat changes

after autoclave

33.0

4.5

62.5

table 2

150

150

150 150

60.7

33.0 30.5

85.0

53.7 45.8

Claims (1)

FIRE-RESISTANT BINDER, including perlite, soluble glass and technical alumina, characterized in that, in order to increase the strength and heat resistance of concrete based on it, the binder additionally contains chamotte fraction ^ 0.25 mm in the following ratio components, wt.%: Perlite 22-30 Soluble glass 5-8 Technical Alumina 27-37 Chamotte fraction <0.25 mm 25-46