SU833738A1 - Raw mixture for producing light-weight fire-resistant concrete - Google Patents

Description

(54) RAW MATERIAL MIXTURE FOR PREPARING EASY HEAT-RESISTANT CONDITION

I

The invention relates to building materials and can be used to prepare lightweight, heat-resistant concretes. The known raw mix for the preparation of heat-resistant concrete 1, containing high-alumina cement, alumina, chromium oxide and aluminophosphate binder with a ratio of ingredients, wt. ° / o High-alumina cement 21-25 alumina 24-28

Chromium oxide9-13

Aluminophosphate bond 38-42

A disadvantage of the known mixture is the low strength of concrete made on its basis.

Also known is the raw mix for the preparation of heat-resistant concrete 2, containing refractory aggregate, phosphoric acid, titanium dioxide and zirconium dioxide.

The disadvantage of such a mixture is the high coefficient of linear thermal expansion and the low strength of concrete made on its basis at high temperatures.

Closest to the present invention is a raw mix for the preparation of lightweight refractory concrete 3, containing, w / v:

High alumina cement 15-21.

Lightweight refractory slag from ferrochrome smelting - 1-3 sodium tripolyphosphate 1-6.

A disadvantage of the known mixture is the high coefficient of linear thermal expansion and the low strength of concrete made on its basis.

The purpose of the invention is to increase the strength at service temperature up to 1300 ° C and reduce the coefficient of linear thermal expansion of concrete based on it.

This goal is achieved by the fact that the raw mix for the production of lightweight refractory concrete, including high alumina cement and lightweight refractory, further contains phosphosit and kaolin with a ratio of ingredients, wt.%:

High alumina cement 25-50

Lightweight Refractories17-25

Phosphite30-40

Kaolin 3-10 283 Introduction of a phosphate aggregate (phosphozite) to the raw material mixture, which has high mechanical strength and low linear thermal expansion coefficient (CTE), contributes to increasing the strength and decrease CTE of concrete based on it. However, phosphozite has rounded, round granules with a fraction of 5–20 mm with low open porosity, as a result of which it does not provide sufficiently strong adhesion to cement paste. Therefore, to ensure a better adhesion of the cement dough with phosphosite, a filler from a 0.15 mm lightweight refractory is introduced into the raw mix. Such a filler, having a porous structure, located around phosphosite, absorbs particles of high-alumina cement, thereby ensuring the solidity of the whole composition. During the process of exposure to high temperatures, kaolin additionally creates a ceramic bond, which further enhances the strength of concrete. In tab. 1 shows the three compositions of the ingredients from which the mixture is prepared, wt.%. In tab. 2 presents the properties of the resulting concretes. Each mixture is sealed with the required amount of water, mixed and concreted. The use of the proposed raw mix for the preparation of lightweight concrete allows to expand the field of application of light heat-resistant concrete, increase strength at high temperatures and reduce the coefficient of linear thermal expansion. Table 1 125254010 25017303 34020355 Table 2

Claims (3)

Claim The raw material mixture for the preparation of light heat-resistant concrete, including high-alumina cement and lightweight refractory, characterized in that, in order to increase strength at a service temperature of up to 1300 ° C and reduce the coefficient of linear thermal expansion, it additionally contains phosphositol and kaolin with a ratio of ingredients weight. ^p / ₀ : High alumina cement 25-50 Lightweight Refractory 17-25 Phosphite ZO 40 Kaolin 3-10 ⁴⁵ Sources of information taken into account during the examination 1. USSR Copyright Certificate No. 284669, cl. C 04 V 35/14, 1971. 2. French Patent No. 2140847, ₅₀ cl. C 04 V 35/00, 1973. 3. USSR Copyright Certificate No. 555064, cl. C 04 B 7/32, 1977.