SU1763238A1 - Method of manufacturing decorative concrete articles - Google Patents

Abstract

The invention relates to the construction, in particular to the manufacture of concrete products with decorative veneer. The purpose of the invention is to increase the durability of products. Before being laid in the form of expanded clay gravel that serves as a cladding, it is preheated to 50-250 ° C, which makes it possible to improve the adhesion of the cladding to concrete.

Description

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The invention relates to the construction, in particular to the manufacture of concrete products with decorative veneer.

A known method of making decorative concrete products, including the sequential laying of the concrete mix, cement mortar and granular decorative material, such as marble and granite chips (1).

The disadvantage of this method is the weak adhesion of the decorative stone powder to the cement-sand mortar, as a result of which, during transportation and installation of products, a significant part of the expensive decorative material falls off.

To improve adhesion, the decorative material is washed and dried before laying, and the cement-sand mortar is applied to strictly defined viscosity. These operations complicate the process.

Failure to comply with these technical rules leads to a significant deterioration in the quality of finishes.

The disadvantages of this method are partially eliminated in the method of making decorative concrete products known from (2) This method involves the sequential laying of layers of concrete, cement mortar and porous decorative material in the form of crushed carbonate-silica mold, annealed at a temperature of 900-1000 ° WITH.

The disadvantage of this method is the high cost associated with the organization of small-scale production, and the low decorative potential of rubble from carbolic-silicon flask.

Closest to the invention is a method of making decorative concrete products, including laying in

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the form of expanded clay gravel and concrete mix, vibration, heat treatment, demoulding and applying a protective layer on expanded clay gravel (3).

The disadvantage of this method is the lack of durability of the product.

The aim of the invention is to increase product durability.

This is achieved by the fact that in the method of making decorative concrete products, including laying in the form of expanded clay gravel, concrete mix, vibrating, heat treating, stripping and applying a protective layer on the expanded clay gravel, before laying in the form of expanded clay gravel, it is preheated to 50-250 ° C. .

An example of the method. Samples were manufactured in the form of tiles measuring 16 x 16 x 4 cm.

A 1: 2 cement-sand mortar on Portland Cement M 400 was used as the base of the finishing layer.

The water-cement ratio is 0.5, the mobility of the solution is 6 cm immersion of the standard cone.

The solution was compacted on a laboratory vibroplatform with a frequency of 2800 oscillations per minute and an amplitude of 0.35 mm.

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At the end of the vibration, a layer of granules of expanded clay gravel of 20-40 mm was laid on the solution. 4 series of samples were made with laying of expanded clay gravel, heated in a thermostat to a temperature of 20.50,150,250,350 ° С. After laying the gravel forms were rotated by 45 °, the surplus of granules was sprinkled. The samples were cured for 14 days, and then the surface was painted with phosphate paints using a flat stamp with a soft pad of 25 mm.

The results of the frost resistance test were determined by external examination (see table).

The combination of operations and conditions of the invented method determined by the authors determines its undoubted value for the national economy.

Claims (1)

Invention Formula A method of making decorative concrete products, comprising laying claydite gravel in a mold, a concrete mix, vibrating, heat treating, demolding and applying a protective layer on claydite gravel, characterized in that, in order to increase the durability of the products, it is preheated to 50 - 250 ° C.