SU1668346A1 - Method for decorative finishing surfaces of concrete articles - Google Patents

Abstract

The invention relates to the field of construction, in particular to the decoration of the surfaces of concrete products. The purpose of the invention is to increase the adhesion of the finishing layer to concrete while increasing the degree of prefabrication of products. Decorative finishing is carried out by applying a finishing solution to the surface, grouting, drying and grinding, re-grouting with the simultaneous application of an additional layer of finishing solution and subsequent grinding of the surface. The finishing solutions of the first and second layers are used on the basis of hydrated to a stable contact-condensation hardening. 7 ill., 1 tab.

Description

SP

WITH

The invention relates to the construction, in particular to the decoration of the surfaces of concrete and reinforced concrete products.

The purpose of the invention is to increase the adhesion of the finishing layer to concrete while increasing the degree of prefabrication of products.

Decorative surface finish of concrete products is carried out by population of the finishing solution on the surface, grouting, drying and polishing, repeated grouting with simultaneous application of an additional layer of finishing solution and subsequent grinding of the surface, while the finishing solutions are based on hydrated contact-condensation hardening.

FIG. 1-6 are the flow chart and surface finishing operations: in FIG. 7-treated surface of the product, cut.

Finishing solution 2 is applied to the product 1, then it is blown with air 3, heated or at a normal temperature, and polished with a grinding working organ-bar or disk 4, moistened with a nozzle 5, after that an additional layer 6 of finishing solution 2 is applied. the surface is calibrated, smoothed and ground with a shaft -.7. and the feed hopper 8 finishing solution equip the vibrator. A similar supply hopper 8 with the shaft 7 and the vibrator is installed at the beginning of the scheme. Then the surface of the product is polished and polished with a felt, canvas or leather disc 9.

The decorative finishing method is carried out as follows.

Products, for example, of concrete 1 are fed to the finishing area at the post application site.

about with

CJ

ON

The base solution 2, where the finishing solution coming from the bunker 8 is distributed over the surface of the product 1 by means of a calibrating damping shaft (or discs) 7, the stimulation or distribution of the finishing solution is carried out by vibration and rubbing smoothing actions of the shaft (discs) 7. Thickness a layer of solution 2 should be minimal, covering the roughness of the roughness and the surface topography of the product. The finishing solution is prepared in advance at the site of preparation from white, colored, ordinary portland cement or another hydraulic agent with pigments, fillers, plasticizers to obtain technological and decorative properties, hydrate initially solid with excess water (V / C more than 0.8-1 , 0) with heating up to 60-100 ° C for 15-45 minutes or at usual temperatures (about 20 ° C) for 6-8 hours to 1-3 days with periodic or continuous stirring.

After removing excess water, draining the exfoliated parts of the liquid, the hydrated mass is mixed with the listed additives or used without additives with a moisture content of 30-60% sufficient for applying and leveling the layer 01-1.0 mm. Minimum thicknesses give an economical and more durable coating layer.

Regardless of the moisture at the time of application, the layer of the finishing solution is dried to a moisture in the surface zone of 5-15%, which strengthens and makes it possible to sand the layer with an abrasive material, bars, discs 4 before smoothing the hard surface and sycr- wounds of the uneven terrain. After grinding, the surface is dried, which is accompanied by further hardening of the layer of mortar 2 and removing moisture during wet grinding to a moisture content of 5–15%. Further drying is impractical, since the preservation of high humidity plays the role of lubricant when applying an additional layer of finishing solution and rubbing it with filling the irregularities of the microrelief and creating a layer 6 of minimum thickness 0, -0.1 mm, which plays the role of an additive and clogging substance. The rubbing is accompanied by the formation of thin, smoothly masking the relief of the base, films of the contact-condensation stone, the strength and evenness of which is connected with the rigidity and evenness of the grinding body. Grinding and primary polishing can be done with felt,

canvas, leather disc, shaft with or without polishing additives. Chromium oxide polishing additives, rosin, paraffin and compounds based on them.

In the second polishing stage, after the formation of a stone-like surface, a steel, chrome-plated, carbide working body can be used in the form of elastic blades with an angle of attack of about 2-5 ° rotating or completing.

reciprocating motion.

Polishing creates shine, and pigment creates color and texture.

Various translation methods are possible.

5 of hydraulic transfer to hydrated state, for example by autoclaving, grinding of hardened stone, using cement paste after vacuuming, centrifuging

0 concrete mixes or after the manufacture of asbestos cement sheets, as well as the grinding of waste asbestos cement, concrete and others containing a significant part of the cement stone. Raw materials can also be used cement that has become unusable or has lost activity.

In the process of hydration or after it is completed, when cement stone is broken or after it is completed,

0 powdered filler, which may be inert or perform decorative functions. For this purpose, powders are used that are commensurate in size with hydrated grains.

5 cops with a surface of at least 1000 cm2 / g with a particle diameter of less than 0.14 mm. Such fillers include quartz and other types of sand, ground limestone, ash, ground slags, powdered waste.

0 industry, i.e. non-reactive with cement stone and durable in the weather conditions of the construction area. The volume of the filler is related to the strength and durability of the decorative layer and can be 5 to 0 May. %

For coloring the composition, colored cements, fillers, alkali-resistant pigments are used in an amount necessary to obtain the coloring of the required intensity or a combination of different color possibilities, with imitation of natural stone, wood, fabric, etc.

To renew the surface during operation, it suffices to produce

5 one, two passes of the smoothing or grinding body on the surface of the product having a layer of decorative coating.

If necessary, decorative processing of concrete products can be carried out under the conditions of use of products or in the course of construction, using the proposed method and using grinding trowels and smoothing machines with rotating, moving reciprocating working elements.

The method of decorating the surface of a concrete is carried out as follows.

The method is implemented after the hardening of the concrete on the front surface of the outer wall panel at the finishing and repair station in the molding workshop of the plant. The panel is placed in a horizontal or inclined position, face up.

The finishing solution is prepared at the site for the preparation of decorative and putty compositions of the workshop, where the components of the mixture are mixed, for example, hydrated white Portland cement, pigment-iron powdery red lead, polyvinyl acetate emulsion in the form of an aqueous dispersion and water. Pre-white portland cement is subjected to special treatment, which consists of mixing it with hot (60-100 ° C) water and hydration for 15-45 minutes with continuous stirring, after which the excess water is drained for reuse, and the hydrated white sludge Portland cement is sent to a mixer to prepare a finishing solution.

After obtaining a homogeneous finishing solution on serial mixtures of forced action, it is transported to the panel finishing area. First, the first main layer of the finishing solution is applied, for which purpose a spackling or finishing machine with smoothing shaft and disks is used. The thickness of the layer is practically determined by the height of the irregularities and is 0.1-1.0 mm. Then, a layer of finishing solution is dried, which is carried out by blowing the surface of the product with heated air from the heater unit at 50-1000 ° C. Drying proceeds quickly, since the layer is thin and the ground moisture migrates into the concrete of the product and partially evaporates during blowing, therefore the drying time is 10–20 min. The product after heat treatment also has a high temperature and heats the decorative layer.

Then the main layer is ground. Grinding is performed with abrasive discs, grinding bars, shafts and the like, but the loads on the surface of the layer should not be impact, the pressure on the surface is not more than 0.05-0.1 MPa, which is achieved in the suspended working bodies.

After grinding, the base layer is dried, if the surface is wetted, otherwise drying is not required. Then, a filler layer is applied, which is not a putty, but acts as a clogging layer — an additive that fills the irregularities after grinding, pores and defects of the base layer. The application of the layer of additive is carried out by rubbing with rubber working bodies of the puttying machine, but unlike the putty on the surface of the base layer there should be no water continuous layer of additive except for defective places, pores and roughness.

Grinding is then carried out with a freshly applied layer of additive-finishing solution. The plastic mass in the process of rubbing with felt or canvas working bodies fills (clogs) the macro and microdefects of the surface, adds shine to the surface as it is dried. Grinding time 5-10 min. The haze or gloss of the treated surface is created depending on the grinding time and in accordance with the requirements for the type of finish.

The composition of the finishing solution of the first second layer is identical, which provides technological simplicity. But for the realization of artistic purposes, the composition of the layer may vary according to the content of the pigment, the type of portland cement, sealing additives, etc.

The parameters of the method and the test results are presented in the table.

Claims (1)

The invention The method of decorating the surface of concrete products by applying a finishing solution to the surface, grouting, drying and polishing, characterized in that, in order to increase the adhesion of the finishing layer to concrete with an increase in the factory readiness of the products, after grinding spikes with simultaneous application of the finishing solution and grinding the surface, while the finishing solutions are used on the basis of hydrated to contact and condensation hardening.