SU1538938A1 - Method of producing facing slabs - Google Patents

Abstract

The invention relates to building materials, in particular to methods for the production of facing slabs. The purpose of the invention is to reduce material consumption by reducing the thickness of the plates. A method of manufacturing facing slabs includes laying a structural layer of fine-grained fiber-reinforced concrete mix into a form with a roller pressing pressure of 0.2-0.25 kg / cm ² and a decorative layer of concrete mix with a crushed stone content of at least 50% from 2: 1 to 2: 1.2 at a pressure of roller pressing 0.1 - 0.15 kg / cm ²

the volume ratio of mixtures for structural and decorative layers is from 3: 1 to 4: 1. After that, heat treatment of the molded products, demolding, grinding and polishing are performed. This method makes it possible to manufacture facing plates with a thickness of 15-20 mm.

Description

The invention relates to construction materials, in particular, to methods for the production of facing slabs using the roller pressing method.

The aim of the invention is to reduce material consumption by reducing the thickness of the plates.

The proposed method is as follows.

First, a layer of fine-grained fiber-reinforced concrete is laid into the mold and pressed with rollers at a pressure on the pressure beam of 0.2-0.25 kg / cm-. This concrete mix is placed above the walls of the mold in such a way that when the rollers are pressed, all the particles of the mixture located above the walls would be sucked under the pressure roller. Then a decorative layer of concrete mix is contained on top with a crushed stone content of not less than 50% and, with a coarse and fine fraction, crushed stone from 2: 1 to 2: 1.2. This layer is pressed with rollers at a pressure of a pressure beam of 0.1 - 0.15 kg / cm1. The ratio of the thickness of the structural and decorative layers while maintaining in a ratio of from 3: 1 to 4-1.

For fiber concrete, the amount of fiber was varied from 0.5 to 2 wt.% And the optimal amount was established in the range of 1–1.5%. The tensile strength in this case was 4.8–5.8 MPa, and the prismatic strength was 59.1–60.7 MPa. The water-cement ratio varied in the range of 0.25-0.4. At an established level of 0.3-0.35, the prism strength was 58.4 - 60.8 MPa.

For the decorative layer, the ratio of rubble and sand, as well as the ratio of fine to fine fractions of rubble, was established according to the principle}

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voidness and maximum stone saturation in the surface layer. The ratio of coarse (10–20 mm) and small (5–10 mm) fractions was varied in the range 1.5: 1 to 2: 1.5. The best stone-saturation without gaps and crushing of grains during molding was determined in the range of the ratio of coarse and fine fractions from 2: 1 to 2: 1.2. At the accepted total thickness, the molding of the product is 20 mm, the thickness of the decorative layer (after molding and polishing) should be 4-5 mm. Therefore, the crushed stone should be predominantly flaky in an amount of at least 50% so that when the decorative layer is rolled over the constructive layer, shear occurs.

The thickness of the structural and decorative layers varied from 2: 1 to 4.5: 1 by volume. At the lower border, the product received insufficient strength, and at the top, places with weak stone saturation were formed on the surface of the product. The optimal set the ratio of 3: 1 to 4: 1, at which the flexural strength was 3.2-3.7 MPa.

Optimal embedding of the grains of the decorative layer in the constructional should

3-4 mm. With further grinding and polishing, an average of 5 mm is removed and a decorative layer 4-5 mm thick is formed in the product. When using the proposed method, it is possible to form plates with a thickness of 15 mm or more.

Claims (1)

Invention Formula A method of manufacturing facing slabs, which includes laying structural and decorative layers of rigid concrete mixtures into a form, roller pressing, heat treatment, demoulding, grinding and polishing, characterized in that, in order to reduce material intensity by reducing the thickness of the plates, the structural layer is performed from fine-grained fiber-reinforced concrete mixture at a pressing pressure of 0.2-0.25 kg / cm2, and The Q decorative layer is made of a concrete mixture with a crushed stone content of not less than 50% with a ratio of coarse and fine fractions of crushed stone from 2: 1 to 2: 1.2, pressing is carried out at a pressure of 0.1-0.15 kg / cm , the volumetric ratio of mixtures for structural and decorative layers is from 3: 1 to 4: 1.