SU903345A1 - Concrete mix - Google Patents

Description

(54) CONCRETE MIXTURE

The invention relates to compositions of concrete mixtures with increased wear resistance and can be used in objects subjected to mechanical stress at elevated temperatures.

Known concrete mixes with high wear resistance on the basis of welding slag, ore-containing aggregates and metal scrap 1.

Closest to the proposed is concrete mix 2, comprising wt.%; . Caustic soda or

sodium metasilicate 1.4-3.5

Crushed stone from welding

slag 78,9-82,8

It is ground granulated cottage slag Else

The disadvantages of the known mixtures are slow curing and relatively low heat resistance. Thus, the strength of the materials of the composition of the boundary limits noc.rie steaming and drying varies from 6.0-9.0 MPa to. 10.0-12.0 MPa, maximum application temperature 600 ° C.

The purpose of the invention is to increase the strength and heat resistance of concrete.

The goal is achieved by the fact that a concrete mixture comprising a binder, crushed stone and sand from welding slag contains orthophosphoric acid as a binder in the following ratio of components, wt.%

Orthophosphoric acid1, 6-7.4 Sand from welding slag31.0-39.0 Rubble from welding 1pack. The rest As the filler use 5 sand fraction of 0.1-5 mm and crushed stone fraction 5-20 mm from welding slag, the following chemical composition,%: SiOg. 6.4-12.9, 1.4-2.4, 28.0-30.5, FeO 52.5-62.0, CaO 0.6-D ;, MqO 0.5-2.0.

Orthophosphoric acid is used as a chemical binder. The acid is introduced into the concrete mixture in aqueous solution.

Phosphoric acid interacts with the welding slag to form iron hydrophosphate FePQj, which is characterized by increased heat resistance. The rate of reaction 30 is high in the FenO JljPb system, especially at elevated temperatures, and the surface of the chemically active aggregate is developed to provide a rapid increase in the strength of concrete.

Example. The concrete is prepared and compacted by vibrating. After mixing, the mixture is loaded into molds 70.7x70, 7 mm and compacted on a laboratory vibrating plate.

with an amplitude of 0.35 / mm and a frequency of 2800 col./min.

Samples are tested after 2 or 24 hours storage under normal conditions and also after subsequent drying (T 100 ° C) and calcining (T 800 ° C).

Characteristics of the compositions of concrete mixtures and the construction and technical properties of concrete based on them are presented in the table.

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Claims (2)

n The optimum content of orthophosphoric acid in the mixture is 1.6-7.4%. A decrease in the acid content of less than 1.6% significantly reduces the strength of concrete. An increase in excess of 7.4% accelerates the setting time so much that it makes it difficult to lay the concrete mixture. Claims of the Invention: A concrete mix, comprising bonding, crushed stone and sand from a welding stick, characterized in that, in order to increase the strength and heat resistance of concrete, it contains 58 as a bonding agent orthophosphoric acid in the following ratio of components, wt.%; Orthophosphoric acid1,6-7,4 Sand from welding slag 31.0-39.0 Crushed stone from welding slag Else Sources of information taken into account during the examination 1. Komarovsky A.N. Construction materials for protection against nuclear reactor radiation. M., Atomizdat 1958, p.11,34. 2. USSR author's certificate number 652141, cl. From 04 To 23/00, 1977.