CS201358B1 - Method of making the surface treatment of shaped elements - Google Patents

Description

The invention relates to a method of surface treatment of shaped elements made of concrete or mortar binder.

for aesthetic and other reasons, it is often necessary to apply a surface treatment of graded sands, crumbs and similar granular materials to the surfaces of concrete elements, particularly to surfaces in a horizontal position.

It is known to pour or squeeze sorted crumbs, pebbles or the like into the leveled surface of a concrete or mortar binder and allow the surface to wither or harden. However, only grains larger than 5 mm, in some cases only grains larger than 10 mm, can be fixed by this procedure. This procedure is disadvantageous because of the low adhesion of the pulp or pebble to the substrate. However, this procedure does not allow the use of sands or other round granules whose grains are smaller than 5 mm.

According to the invention, the method of surface treatment of shaped elements made of concrete or mortar binder consists in that a water dispersion layer of thermoplastic polymer is sprayed or poured onto the compacted and leveled surface made of concrete or mortar binder before hardening. copolymer in a dose of 50 to g dry weight per 1 m and in this layer is uniformly applied to the surface, for example by blowing or sprinkling

201

201 338 material, for example sand or grit, whereupon the gritting material is pressed into the dispersion layer of the thermoplastic polymer or copolymers, compacted and leveled by vibration and / or trowel.

To accelerate the curing of the element with the applied layer of an aqueous dispersion of the thermoplastic polymer or copolymers and the spreading material, the element is exposed to an elevated temperature of up to 90 ° C.

The advantages of the process according to the invention are that the entire surface treatment system is permanently interconnected with one another, since an adhesive layer of the polymersilicate type is formed and the dispersion binder exits between the grains of the spreading material.

After the concrete or mortar binder has hardened and the dispersion binder has dried and if any excess grains of gritting material have been removed, it is advantageous for the surface, for example, to be sprayed, painted or poured, another layer of dispersion or polymer solution or silicone preparation or hydrophobizing agent.

By the method according to the invention, differently structured and colored surfaces can be produced and different colors of the spreading materials as well as their different shape and grain size can be utilized, even grains smaller than 5 mm can be used. The dispersion binder forms a very durable adhesive layer both against the substrate and between individual grains of the spreading material.

The process of the invention is illustrated by the following examples:

Example 1

The top surface of the horizontally produced sandwich panel had to be surface-treated to a medium-grained texture in various colors before drilling. After forming the element in the open mold, compacting the vibrations and smoothing the surface with laths and trowels, a 25% aqueous dispersion of polyvinyl acetate-acrylate copolymers was sprayed onto the surface in a batch

600 g / m. After a five-minute break, the entire surface was covered with a 2 to 4 mm colored silica sand screen at a rate of 4 kg / m 2. After filling, the entire surface was compacted by lightly tapping the steel trowel and finally smoothed smoothly and evenly.

The whole element was then heated at 60 ° C for 6 hours. After demolding, the surface was then sprayed with a silicone acrylate resin to increase hydrophobicity and reduce the dirtyness of the finish.

Example 2

The upper surface of the concrete railing, 30 cm wide, after concrete placement, densification and smoothing, was surface treated by first pouring a 20% aqueous 2 acrylic polymer dispersion at a dose of 2OC0 g / m 2 onto the smoothed surface and covering the surface with marble crushed from 1 to 7 mm. The surface was leveled with a dry brush and then compressed with a plastic trowel. After hardening, which lasted for 3 days, the excess debris was removed with a dry brush. Example 3

The 120 x 300 cm loggia panels were sprayed on the upper surface with 40% styrene-acrylic copolymer dispersions prior to steaming, and colored sand of 1 to 3 mm grain size was blown over the layer with an injector so that the entire area was evenly covered. Then the entire element was again vibrated briefly and then

201 3S8 as usual. After demolding and partially drying the panel, a transparent polyester self-leveling floor covering was applied to the surface at the assembly station in such a dose that the surface was almost smooth. Tim was made aesthetically very effective and non-slip surface.

Claims (3)

STOP THE INVENTION 1. A method of surface treatment of molded concrete or mortar binder elements, comprising spraying or pouring an aqueous dispersion layer of a thermoplastic polymer or copolymer in a dosage of from 50 to 50, prior to setting, on a compacted and leveled concrete or mortar binder. o Iron _{g of} dry weight per 1 m and spreading material, for example sand or grit, is uniformly applied to this layer, for example by blowing or sprinkling, whereupon the spreading material is pressed into the aqueous dispersion layer of the thermoplastic polymer or copolymer, compacted and leveled by vibration and / or trowel. 2. A method according to claim 1, characterized in that the element is subjected to an elevated temperature of up to 90 [deg.] C. to accelerate the curing of the element with the applied layer of an aqueous dispersion of the thermoplastic polymer or copolymer and the spreading material. Method according to either of Claims 1 and 2, characterized in that the surface is, for example, sprayed, painted or poured with a further layer consisting of a dispersion or solution of a polymeric substance, or a silicone preparation, or a hydrophobising agent.