LV14019B - Heavy concrete - Google Patents

Abstract

The invention relates to the area of manufacture of building materials, in particular to manufacture of heavy concrete. It is offered new material - heavy concrete, which contains metal filling compound with following structure (on weight): 10-20 % ferrous or steel powder with the size of particles 15¸100 micrommeters, 20-30 % steel rolling scale with the size of particles 5¸20 micrometers, 50-70 % steel waste from sheet punching with the size of particles 1,0¸5,0 mm. The received concrete has density from 3000 to 4500 kg/m3 and strength on compression after 28 days up to 50 MPa. A waste formed on filters in metallurgical manufacture can be used as an iron powder. The offered decision in comparison with known allows to receive following advantages of a material: technical (it makes possible to manufacture a material with the raised density and stability against radiation); economic (it makes possible to get lower cost of a material due to use of waste of metallurgical and machine-building manufacture); ecological (it makes possible to use production wastes rationally for manufacturing products with high technical parameters and provide radiological protection).

Description

The present invention relates to the field of construction materials, in particular to the production of heavy concrete.

Normal concrete with a density of 2000 to □ is widely used in construction

2600 kg / m in the dried state [1]. It is based on aggregate rock (dolomite, granite, diabase) of medium specific gravity [2].

Heavy concrete with metal fillers containing metal shavings, shavings or metallurgical residues such as metallurgical slag is known [3]. Such concrete has high density and high abrasion resistance. It is used, for example, in the manufacture of concrete floors in industry [4]. Heavy concrete with a density greater than 2600 kg / m is used in hydraulic engineering as well as for protection against radioactivity.

Closest to the proposed solution is concrete [5] (prototype), which uses a rolling filler as a metal filler. The rolling bed has a high material particle density of up to 5.1-5.3 g / m ³ , which contributes to the final increase in concrete density. Such concrete is used in equipment for protection against radioactivity, as well as for the production of heavy ballast and anchors. The disadvantages of this material are:

• increased use of cement;

• 3 • Density not exceeding 3000 kg / m.

The aim of the proposed solution is to create heavy concrete and its production method, which provides increase of density up to 3500 - 4500 kg / m ³ , as well as abrasion resistance.

To accomplish this, concrete with metal filler containing (by weight) 10 to 20% metal powder, 20 to 30% rolling mills and 50 to 70% steel extrusion is offered.

The metal powder provides an increase in the specific mass of the finished material. The use of iron powders, such as ASC 100.29 with a particle size of 15-20 pm, as well as industrial residues of metal powder production filters is recommended.

It is recommended to use iron powder (particle size 10 to 20 pm), crushed rolling mead (particle size 100 to 300 pm) and steel stampings (particle size 1 to 5 mm) as filler at the same time.

Variations of the composition of the proposed material and the method of its preparation are discussed in Examples 1 and 2 below.

Example 1 - Heavy concrete with high density (3000 to 3200 kg / m ³ ) and compressive strength up to 50 MPa after 28 days

Concrete composition is as follows (parts by weight):

cement CEM1 42,5 N - 1.00, quartz sand - 0.65, steel mower - 3.95, iron powder - 0.00, water - 0.55, superplasticizer - 0.015, water cement ratio - 0.55.

Example 2 - Heavy Duty Concrete with Heavy Density (4000 to 4300 kg / m ³ ) and Compressive strength up to 40 - 43 MPa after 28 days

Concrete composition is as follows (in parts by weight):

cement CEM1 42.5 N - 1.00, steel mead - 3.49, steel stamping applied residues - 2.69, iron powder - 1.62, water - 0.62, superplasticizer - 0.016, water cement ratio - 0, 62

The technology for the preparation of mixtures is as follows. The raw materials are weighed to an accuracy of + 1%, stirred dry for 1 minute in a standard (gravity or pan type) concrete mixer. Add water and stir for another 3 to 4 minutes.

The proposed solution has the following advantages over the known ones:

technical (provides density, radiation resistance); economic (enables to reduce the cost of concrete components at the expense of metallurgy and mechanical waste);

ecological (makes it possible to utilize the applied residues in the form of metallurgical slag, the applied residues from filters).

Used information sources:

1. LVS EN 206-1: 2000. Concrete. Part 1: Technical regulations, performance, production and conformity.

2. R. Chundelly, R. Geeno Building Construction Handbook. Britsh Library Catalogig in Publication Data. 2001, pp. 347.

3. Qasrawi H., Shalabi F., Asi I. Use of low CaO unprocessed steel slag in concrete as a finite aggregate. - Construction and Building Materials, No 23 (2009), p. 1118-1125.

4. Hummel. Das Beton ABC. Schwerbeton. Leichbeton. 1959

5. Eisen kiesbeton nach neuer Schwerbetonrezeptur. Steinbuch und Sandgrube. 2008 (prototype)

Claims (2)

Claims 1. Heavy concrete with metal filler, characterized in that the combination of materials (% by weight) is used as metal filler: - iron or steel powder with a particle size of 15 to 100 µm, 10 to 20%; - steel rolling mill with particle size from 5.0 to 20 pm - 20 to 30%; - Stripping residues of strip steel with a particle size of 1.0 to 5.0 mm - 50 to 70%. Heavy concrete according to claim 1, characterized in that the metallic powder used is a dusty residue from metallurgical production filters.