SU817007A1 - Raw mixture for producing fire-resistant concrete - Google Patents

Description

one

FIELD OF THE INVENTION The invention relates to compositions of raw materials for the manufacture of refractory concrete.

. Raw materials are known for the manufacture of refractory and heat-resistant concrete, including refractory clay and phosphoric acid Cl,

The disadvantage of such mixtures is that the mixtures are based on finely ground refractory glass; and orthophos; fornoric acid hardens intensively only as a result of heat treatment at 200-300 ° C.

Closest to the offer is a mixture that contains, wt%: Bm1mt 25-35, refractory clay 10-15, hromo-alumina additive (production waste of dehydrated butane-butylene) 30-45 and cherthophosphoric acid 15-25 G2.

The disadvantage of it - low strength in the early stages of hardening and the need for heat treatment of the product.

The purpose of the invention is the elimination of heat treatment of concrete and obtaining a higher strength in the early stages of hardening.

The goal is achieved by the fact that the sfie mixture for the manufacture of refractory concrete, including orthophosphoric acid, chamotte, aluminum-containing component and additive, contains technical alumina as the aluminum-containing component and weight, and pyrite cinders as an additive, with the following ratio of components, weight. %:

Orthophosphoric acid 10-20 Technical alumina 5-10

0 Pyrite cinder 10-20 Fireclaying Others

The chemical composition of the iron-containing component - pyrite cinders is the following, wt.%: 5102.20-23, RedO,

5 61-65, FeO 4.6-5.4, CaO 1.6-2.5, MgO up to 1, SO 3-5,

Technical alumina contains in its composition more than 98%. According to Yusnov's physicomechanical indicators, he satisfies the requirements of GOST 6912-74.

Example. For the manufacture of concrete samples as Additive 25- (CI use pyrite cinders, representing dark brown powder with an apparent density of 4000 kg / m and a bulk density of 11001300 kg / m. The ratio of components 30 is given in Table 1. Taken into the dry components are mixed together. The mixture is closed with a 70% aqueous solution, mixed and the mobility of the concrete cm s is determined, which is estimated by the cone sediment. To determine the compressive strength, 7x7x7 cm cubes were formed and kept for spirit at within 2.4 and 6 hours and 1-7 days. Testing for heat resistance is carried out according to the Instructions on the technology of preparation and use of heat-resistant CH-15 concrete by the method of water heat changes in the mode of 20-800-20 ° C. The test results are given in table. 2. As can be seen from Table 2, the proposed concrete mixture has good workability as compared to a concrete mixture without the addition of pyrite cinder. As a result of the introduction of pyrite cinder to the mass containing chamotte, technical alumina and orthophosphoric acid / concrete mixture acquires the ability to self-generate hardening freely in the air, acquiring, at the age of one day, a strength sufficient for stripping, transporting and assembling the products. In this case, the process of manufacturing products from heat-resistant concrete is simplified, since heat treatment is eliminated. Heat treatment of products can be carried out directly assembled in the heat unit. Table 1

Chamotb O Alumina technology12 16 22 nd 10 10 Pyrite cinder 15. Orthophosphoric acid of 70% concentration 15 Lamot50 Technical alumina 10 13 18 24 Pyrite cinder 20 10 Orthophosphoric acid 70% concentration 20 Fireclay 75 Technical alumina5

T. a. b l and c a 2 6 85 450 8 88

ten

3. Pyrite cinder 10

Phosphoric acid 70%

10 concentration

Claims (2)

1.Zam Tin S.R. Chamotte concrete on a clay-phosphate bond. Auto5 ref. Cand. diss. Sverdlovsk, 1969. 2. USSR author's certificate number 563398, cl. From 04 To 29/02, 1976.