SU773010A1 - Raw mixture for producing light fire-resistant concrete - Google Patents

Description

The invention relates to building materials and can be used to prepare lightweight, heat resistant concrete. The known raw material mixture for the preparation of lightweight, heat-resistant concrete containing high-alumina cement and waste from the electrode industry l. A disadvantage of the known mixture is the high thermal conductivity of the concrete obtained on its basis. Closest to the proposed is a raw mix for the preparation of lightweight refractory concrete containing high alumina cement 20-30, alumina filler 67-72 and additive 3-5 2. A disadvantage of the known mixture is the low temperature resistance and high thermal conductivity of concrete based on it. The purpose of the invention is to increase thermal stability and reduce the thermal conductivity of concrete based on the mixture. The goal is achieved by the fact that the raw mix for the preparation of light heat-resistant concrete, including high alumina cement, aggregate and additive, contains phosphosite as a filler and asbestos fiber as an additive in the following ratio of ingredients, wt.%: Phosposite 50-75 Asbestos fiber 5-10 High-alumina cement. The remaining Introduction to the raw material mixture as a coarse aggregate of phosphoshite having an application temperature equal to and greater allows the use of the proposed mixture to be increased. - production of concrete with a high temperature of operation. In addition, phosphosit is a lightweight aggregate and has a fine-grained structure, which significantly reduces the thermal conductivity of the resulting concrete. The introduction of asbestos fiber improves the adhesion of phosphoshite with zhuishm. When heated, magnesium hydrosilicates contained in asbestos are dehydrated and actively interact with the permeation-cement minerals, while retaining their reinforcing properties after exposure to high temperatures. Thus, the introduction of the composition of the raw mix asbestos fiber

allows to obtain concrete of high heat resistance.

To obtain a raw mix, three compositions of ingredients are prepared, each containing, wt%:

.12 3 Ultraglynosis

15

45 50 5

mystic cement

30. Phosphite

75 10

62.5

Asbestos 7.5 fiber

Before preparing the mixture of asbestos, the fiber is pre-emptied, after which all the components of the mixture are thoroughly mixed, sealed with water, concrete, and the resulting concrete is autoclaved.

The resulting concretes have the characteristics shown in the table.

The proposed raw material mixture allows you to expand the scope of application of lightweight, heat-resistant concrete, as well as significantly improve the thermal insulation properties of concrete based on the proposed mixture.

Application temperature, with

Heat resistance of water heat changes, C

Claims (2)

Coefficient 0, 38. 0.41 g, kcal / MCH 1-deg. Invention A raw material mixture for the preparation of lightweight refractory concrete, including high alumina cement, a filler and an additive, characterized in that, in order to increase the heat resistance and reduce the heat conductivity of the concrete, it contains aggregate phosphosite and, as an additive, asbestos fiber with a trace of the ratio of ingredients, air stuff.%: 1300 1300 1100 11 13 0.48 0.39 Phosphite 50-75 Asbestos fiber 5-10 Vasokoglyuminomisty cementTsHztalny Sources of information, ntoe taken into account during the examination 1. The author's certificate of the USSR 621655, cl. From 04 To 15/02, 1977. 2. Authors certificate of the USSR 629186, cl. From 04 To 15/00, 1977.