SU1653976A1 - Method of manufacturing reinforced concrete products with decorative surface layer - Google Patents

Abstract

The invention relates to the production of precast concrete products with a decorative surface. The purpose of the invention is to reduce labor costs while increasing the equilibrium adhesion of the decorative filler to the product. First, a mixture of the underlying layer is prepared, containing, by weight: decorative aggregate 8; sand 2.4; cement 1; Cement hardening retarder 0.022 is applied to the bottom of the mold, compacted with vibration, after which the concrete mix of the textured and structural layers is successively laid, vibration compaction and heat treatment are performed followed by stripping and cleaning of the product. 1 ep f-ly. 1 tab

Description

The invention relates to the production of reinforced concrete products and can be used for decorative finishing of surfaces of reinforced concrete and concrete products in factory conditions during their molding using face-down technology.

The purpose of the invention is to reduce labor costs while increasing the equal strength of adhesion of the decorative filler to the product.

A method of manufacturing a decorative layer of reinforced concrete products, such as wall panels, is carried out as follows.

A mixture of decorative aggregate with sand, cement and a hardening inhibitor is prepared in the mixer, having previously determined in laboratory conditions the specific consumption of sand and cement from the applied aggregate fraction and the percentage of hardener by weight of cement, which prevents the cement from setting and hardening for 4- 10 hours after steaming the panels.

A single-part decorative aggregate, sand, cement, and a hardener in dry form are sequentially loaded into the mixer and mixed for 2 minutes. After pre-mixing, water is introduced into the mixer (or an aqueous solution of the curing retarder, if it has not previously been introduced into the mixture in a dry form) and the entire mixture is thoroughly mixed for 3 minutes.

The prepared mixture evenly in one layer of filler is placed in a form installed on the vibrating table. Turn on the vibrator for 30-40 s. As a result of vibration, the mixture is evenly distributed over the entire surface of the pallet and at the same time compacting the cement sand base layer between the filler grains. The height of the underlying layer must be equal to the depth of the filler

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After the underlying layer dries out, after 20-40 minutes, the textured solution is gently placed in a uniform layer and vibrated. Further technological operations are performed in accordance with the prior modes. The cleaning of the front surface of the panels is carried out with brushes and rinsed with a stream of water.

Example. The specific consumption of the mixture components from the applied decorative aggregate fraction (erkleza) and the percentage of cement hardening agent (borax) are preliminarily determined. The mixer is sequentially loaded with an erclosis fraction of 15–20 mm, sand fractions less than 2.5 mm, cement and powder in a ratio of (in parts by weight), respectively, 8: 2.4: 1: 0.022 and stirred for 2 minutes. Then, water in an amount of 75% by weight of cement is introduced into the mixer and the whole mixture is stirred for 3 minutes.

The resulting mixture at the rate of 27 kg per 1m2 of the surface of the pallet is placed in a mold installed on the vibrating table and vibrated for 40 s. As a result of vibration, a uniform

distribution of the mixture over the surface of the mold and compaction of the cement-sand pat- ter in the aggregate layer. The height of the underlying cement-sand layer is on average 7 mm.

30 minutes after the mixture dries, further technological operations are carried out in accordance with the accepted modes. Cleaning the surface of the non-adhering solution is carried out with brushes and rinsed with a stream of water.

The table shows the results of tests of texture finishes performed by the proposed and known methods.

On the basis of the test results, it can be seen that the frost resistance and the average adhesion strength of the erklez with an textured solution according to the proposed and known methods are the same, but the range is

Neither the adhesion strength of the ercleaa with the textured solution by the proposed method is 2.8-4.0 times less than that of the known.

The proposed method provides the strength of adhesion of air-glass with a textured solution of at least 10 kg / cm2 and the frost resistance of the decorative layer for at least 75 cycles.

The technical and economic advantages of the proposed method in comparison with the known method are as follows: reducing the labor intensity and labor costs for the manufacture and laying on the pallet of the decorative filler and base layer forms and improving the quality of the decorative surface of the products.

Claims (2)

1. A method of making reinforced concrete products with a decorative layer, including preparing a mixture of the underlying layer containing sand, cement hardening agent and water, applying it to the bottom of the form, introducing a decorative filler, compaction, sequential laying of the concrete mix of the textured and structural layer, vibration compaction and heat treatment with the subsequent stripping and cleaning of the product, characterized by the fact that, in order to reduce labor costs while increasing the adhesion strength of the decorative filler to the product In the process of preparing a mixture backsheet administered decorative filler and cement and further compacted by vibration. 2. The method according to claim 2, characterized in that the underlying layer contains, wt. Decorative filler8 Sand2.4 Cement1 Hardener cement0.022