SU981280A1 - Raw mix for preparing high-temperature concrete - Google Patents

Description

The invention is related to the refractory industry and can be

used in the manufacture of heat-resistant concrete used for the manufacture of constructs of various sizes designed for footers of thermal units.

Known mixtures for the preparation of heat-resistant concrete, including

.sv zukadee and refractory .clip ClJ. J

Closest to the offer is a raw material mixture for the preparation of heat-resistant concrete, including, wt.%: Alumina cement, 20; fireproof aggregate 8i,

(lumpy fraction of the fraction .. 0-5 mm 40% s lump fire clay fraction of 5-20 mm 40%) 2.

The disadvantage of this raw mix is the low strength of concrete with its high porosity.

The purpose of the invention is to increase the strength of concrete.

The goal is achieved by the fact that the raw material mixture for the preparation of refractory concrete, including clay and cement and chamotte aggregate, additionally contains heat-treated in coking medium

gas chamotte filler in the following ratio of components, wt.%:

Aluminous cement15,0-30,0

Chamotte

aggregate 10.0-40.0 Thermoprocessed in the environment

10 coke oven gas chamotte filler. 30, Or75, O

The chamblet aggregate heat-treated in the environment of coke gas is obtained by thermal treatment of the chamotte filler, subjecting it to periodic heating and cooling at 20-800 С in the furnace. Heated to 800, lead with speed

1-3VMHH 13-16 h. Then heated to chamotte. Cooled to room temperature and again heated to Such repeated cycles.

25 heating-cooling during testing 150, 300, 450 heat changes are carried out in the direct coke oven gas medium, which is fed into the furnace for heating the fireclay during the entire period

30 heating.

The specified conditions of heat treatment of chamotte filler correspond to the working conditions of the refractory lining of the coke oven door.

The data obtained are given in Table 1.

- From tab. As can be seen from Fig. 1, the best quality filler compared to the prototype is a filler, which is obtained by acting on the heat-chamotte in direct coke oven gas for 300 heat cycles.

With a decrease in the number of heat shifts to 150, a large number of large pores (up to 20%), a sufficiently high water absorption, which characterizes the presence of large cracks and pores, and an insignificant filling of cracks and pores with carbon, which reduces the heat resistance

products made of heat-resistant concrete, obtained with such a filler.

An increase in the number of heat shifts of more than 300, for example, up to 450, is inexpedient, since it is not observed

the apparent improvement in these indicators, and the costs and time to heat treatment increase.

Heat treatment in air leads to an increase in porosity,

0 fracture and volume weight reduction.

Mixtures for the preparation of heat resistance of concrete and the test results are given in Table. 1, 2 and 3.

5 It is evident from the above data that with the introduction of from 75 to 30% of the heat-treated aggregate, with an increase in the binder content from 15 to 30%, the strength increases and the porosity of concrete decreases.

.Table

26.0 18-20

1.92 1.97 13 11

%

41.2

42

Aluminous Cement - Binder

Chamotte filler

Thermally treated medium

90 coke oven gas

13.1

29.0

. 2.06

1.89

6.5 15

40.3

42

6.4

15

20

30 40

35

one

25

ten

45

80

75

55

thirty

U

170

Prototype Offered

Claims (2)

1.Sizov V.I. and others. Technologists of concrete and reinforced concrete products. 4Q M., Higher School, 1972, p. 94-99 .. 2. A mixture of heat, resistant concrete. TU-14-130-74.