SU1079626A1 - Concrete mix - Google Patents

Description

The invention relates to the industry of building materials and can be used in the lining of thermal units, such as an annular cooler for a roasting machine for the production of iron ore pellets.

There are known compositions of concrete mixes for lining, for example, including weight: liquid glass 17-23, fine grinder, a mixture of baked hydrated alumina cement and chamotte (a ratio of 1: 3.6 - 2) 13-17; hardener k-S and chamotte filler - the rest is Cl.

Closest to the invention to the technical essence is a concrete blend, comprising, in wt.%: Crushed macadam fraction 5-15 mm $ 035, 5; chamotte sand fraction 0 mm 2k-26, k, alumina cement 20.5-23.6; liquid glass with a density of 1.37-1.38 g / cm above 100% by weight of dry components 17.7-20.7 ° C. The disadvantages of this concrete mix are low strength at three days of age with normal hardening and at elevated temperatures and adhesion ability to. This makes it difficult to repair the ring cooler of the roasting machine for the production of iron ore pellets.

The purpose of the invention is to increase the strength in a three-day age at normal hardening and at elevated temperatures up to, as well as adhesion.

The goal is achieved by the fact that the concrete mixture, including alumina cement, liquid stack / chamotte filler fraction 3-20 mm, chamotte filler fraction O, mm, additionally contains sludge electrocorundum with a content of 3-89 during the next component ratio, wt.% :

Aluminous

cement 10-20

Liquid glass 10-20

Chamotte aggregate fraction 5-20 mm. 35-53 Chamotte aggregate of fraction 0, mm 12-20 Electrocorundum sludge containing A KOa 83-89 content 5-15 Electrocorundum sludge is a fine powder of the following chemical composition, weight: AUOi 83-89; RedP 1.8-3.0; TUT 2,5-Jf, 0; CaO 0.8-1.6; SIO-j 1, 3-3,0; MpO 0, -0.5; with 0, -0.6. Such a sludge is a waste of the Zaporozhye abrasive combine.

The proposed concrete mix is prepared by thoroughly mixing the dry components in the mixer, followed by the introduction of liquid glass. The finished concrete mix is placed in the form with the use of vibration. The molded specimens were kept in molds for 1 day, then unfolded and held in air for 3 days. After that, the samples are dried and heated to certain temperatures, determining their strength and value of adhesion.

The compositions of concrete mixtures are given in Table 1, the strength characteristics of the samples are given in Table 2.

Table 3 shows other physicomechanical and refractory properties of samples from the proposed concrete mix.

Introduction to the composition of the proposed mixture of fine sludge electrocorundum increases the strength of concrete at a three-day age of natural hardening and at high temperatures, increases adhesion to the metal 1.3-2 times as compared with the prototype. In addition to this, the plasticity and workability of concrete, which increases, leads to a reduction in labor costs during the repair of the ring cooler of the roasting machine.

Table 1

 Content

 Content

A content

Proposed

one

2

3 Prototype

table 2

39.0 51.01.3

37,553,51,65

Yu, 0 5.52.0

26.0 2i, 01.0

It seems with a raft:

ness, kg / m

natural

humidity 2330 2350

2150 2200 2230

2 3 25 30 35

1079626

Table 3

Claims (1)

CONCRETE MIXTURE, including alumina cement, water glass, chamotte filler fraction 5 ~ 20 mm, chamotte filler fraction 0.145 mm, characterized in that, in order to increase strength at three days of age under normal hardening and at elevated temperatures up to 1200 ° C as well as adhesive ability, it additionally contains electrocorundum sludge containing Oj 83-89% in the following ratio 1 components, wt.%: Alumina cement 10-20 Liquid glass Fireclay aggregate 10-20 fractions 5 * 20 mm 35-53 Fireclay placeholder fractions 0.14 mm 1Ilam corundum with a content of A1 ₂ 0 _h 12-20 83-89% 5-15