SU697440A1 - Raw mixture for producing heat-resistant concrete - Google Patents

Description

The invention relates to the field of construction and the watering of building materials and can be used in the manufacture of products and structures that are exposed to temperature and wear during operation. . Raw mixtures for heat-resistant concrete are known, including aggregates and finely ground additives from natural and artificial materials 1. The disadvantage of the known mixtures is their low resistance to wear. The closest to the invention in technical essence and the achieved result is a raw mix for the manufacture of heat-resistant concrete comprising 14%, aggregate 81.4% and finely ground additive 4.6%, in which portland cement, steel chips are used as components. together with chamotte and ground chamotte {2. A disadvantage of the known mixture is the relatively low resistance of concrete to abrasion and impact due to the fact that steel chips at a temperature of application of 400-500 ° C are covered with scale, which leads to a breakdown of adhesion to the cement stone. The aim of the invention is to increase the resistance of concrete to abrasion and impact effects. The goal is achieved by the fact that the raw mix for the production of heat-resistant concrete, comprising sticking, aggregate and finely ground additive, contains as a aggregate an agglomerate of metallurgical mixture of 5-20 mm in size and less than 5 mm in the following ratio of components, wt.%: In the slant. . 12-18 Metallurgical charge agglomerate with a particle size of 5–20 mm, 40–45 with a grain size less than 5 mm. 30–35 T, it is used to grind from the additive 8–12 external surface, due to which secured its fastening in the mortar part of the concrete.

Good agglomerate adhesion in combination with its high wear resistance ensures resistance to concrete wear at high temperatures.

An example. An agglomerate is used to make the raw mix.

metallurgical charge with a sinter strength of 3.5 Pa, water absorption of 2.7%, bulk density of the fraction 5-20 mm 1590 kg / m and fraction less than 5 mm 1800 kg / m.

The granulometric composition of the fractions used sinter is presented in table 1.

Table 1

The partial residues 64.2 35.8 on the sieves The mineralogical sinter of the metallurgical charge is represented by magnetite and hematite, the total content of which is 66.78%. In addition to these, calcium ferrites, iron sulfides, orthosilica are contained in the agglomerate. Concrete for testing from raw mixes are prepared according to the usual technology.

Portland Cement M 500

14

Aglmerath

Thin ground

4.6 chamotte 32.8

The compositions of the raw mixtures of refractory concrete are presented in tab. Z.

Table 3

15

18

ten

12 31.5 7.5 12.8 5.4 9.8 I. you iron and calcium. Silicate phase is represented by glass with a high content of olivines. The chemical composition of the metallurgical charge agglomerate is presented in Table 2. Table 2

The test results are made from raw materials of heat-resistant

Indicators

Residual strength after exposure to temperature 880s,%

Abrasion g / cm

Weight loss when testing for impact wear, g / cm

From the test results presented in Table 4, it appears that the residual strength of the concrete from the proposed raw mixes is higher than the known heat-resistant wear-resistant concrete by 15-30%, and abrasion and impact wear are reduced by 25-40%.

Claims (2)

1. Nekrasov K.D. Heat-resistant concrete on Portland cement. M., stroiizdat, 1969, pp. 39-60. 2. Nekrasov, KD, Tarasova, AI, Jaropornye concrete for the floors of hot shops. Sat Research on refractory concrete and reinforced concrete. M., Gosstroyizdat, 1954, p.280.