SU1588728A1 - Initial composition for producing lightweight refractory concrete - Google Patents

Abstract

The invention relates to compositions of raw materials and can be used in the manufacture of light refractory concrete on porous aggregates. The purpose of the invention is to increase the initial and residual strength, decrease the thermal conductivity coefficient, increase the application temperature and reduce shrinkage after heating 800 ° C. Raw mixture contains, wt%: liquid glass 29-37

portland cement 5-7

fine ground Azerit 19-21

azerite sand 12-14

azeritic gravel 27-29. When using the mixture, the compressive strength of light heat-resistant concrete increases by 1.8-1.83 times, the residual strength after heating 800 ° C by 29-31%, the application temperature by 200 ° C, the coefficient of thermal conductivity at 600 ° C decreases by 15- 17%. 4 tab.

Description

The invention relates to the composition of raw mixes and can be used in the manufacture of lightweight, heat-resistant concrete to isolate thermal units and their elements operating at high temperatures.

The purpose of the invention is to increase the initial and residual strength, decrease the thermal conductivity coefficient, increase the application temperature and reduce shrinkage after heating 800 C.

Azerit is an artificial porous aggregate (POT Az. SSR 473-80), obtained by preliminary high-temperature processing and rapid cooling of the raw material, followed by grinding, granulating and firing in thermal units. As a source of raw materials used clay Sumgait field the following chemical composition, Z: SiO 50,08; AljOj 13.13; 5.7; CaO 10.36; HgO 2.8; + 4.4iB; PSA 0.89, ppt rest.

A distinctive feature of Azerite technology is the ease of implementation and the possibility of obtaining artificial porous fillings from widely used and non-deficient raw materials.

The characteristics of the azerite gravel are as follows:

Bulk density, kg / m 280

Density, g / cm 580

Porosity,% 84,6

Humidity,% 0,00 Durability at sdavshshsh in the cylinder, MPa2,06

ate

00 00

tsD

00

Coefficient of softening .0,84 Filler grade by bulk density. 300 At the same density, azerite gravel is 2-3 times stronger than expanded clay gravel according to GOST 9759-83,

A very positive factor is that Azerite gravel has a highly developed surface porosity. This ensures a good adhesion of the aggregate to the concrete, improving the characteristics of concrete.

The mixtures are prepared as follows.

Example 1. To produce a prototype mixture of the prototype, dry materials are loaded into the mixer and mixed for at least 1 minute, after which liquid glass is poured into the mixture and the mixture is stirred for at least 3 minutes. Next, the mixture is poured into molds and compacted on a vibrating table. The time from the preparation of the concrete mix to its length should not exceed 30 minutes.

Hardening of concrete occurs under natural conditions for 3 days. After hardening, the samples are dried at 105-110 s to constant weight.

Determination of the reference compressive strength and residual compressive strength after heating. produced in accordance with the requirements of GOST 10180-78.

The mixture consisting of hardener - Portland cement, finely ground additive, sand and coarse aggregate from Azerite is thoroughly mixed, and then liquid glass is added and further mixed for 3 minutes and then poured into molds and compacted. Prepare the mixture according to known instructions.

five

R

five

0

five

40

45

Hardening of concrete occurs under natural conditions for 3 days. The study of the control compressive strength and residual compressive strength and residual compressive strength after heating is carried out in accordance with GOST 10180-78.

The coefficient of thermal conductivity is determined according to GOST 12170-76.

The results of the studies are shown in Table. 1 and 2.

It follows from the above data that when using the proposed raw mix, the initial strength of light heat-resistant concrete is increased by 1.8-1.83 times, the residual strength after heating is 29-31%, the application temperature is 200 ° C, the thermal conductivity decreases after heating 600 ° C 15-17% compared with the prototype.

Claims (1)

Invention Formula Raw mix for making light heat-resistant concrete, including water glass, portland cement, fine ground additive, fine and coarse aggregate, characterized in that, in order to increase the initial and residual strength, reduce the heat conductivity coefficient, increase the application temperature and reduce shrinkage after heating 800 ° C, it contains fine ground Azerit, white sand and Azerite gravel as a finely ground additive, fine and coarse aggregate in the following ratio, wt.%: Liquid glass 29-37 Portland cement5-7 Thinned Azerit19-21 Azerite sand 12-14 Azerite gravelErest Table t t a b l n 2 37.65 3.76 29 33 37 18.82 10.46 29.28 -0.40 14 13 12 29 28 27 -0.28 -0.30 -0.30 4.4 4.5 5