The text discusses in detail this type of finishing material, such as wear-resistant concrete paint for exterior work: the existing types of compositions, their functionality and properties, characteristics, advantages and disadvantages. In the article you can find information to help choose and properly use paints and varnishes for concrete surfaces used in outdoor conditions.
Wearproof paint on concrete for external works and expediency of its use
Concrete is a very durable and reliable material, endowed with many useful characteristics. Therefore, it is widely used in suburban construction for the construction of houses and refining plots. Concrete structures that are operated in outdoor conditions are adversely affected by weather and climate conditions.
The negative factors of influence include:
- ultraviolet radiation;
- seasonal freezing and thawing;
- mechanical load properties.
In addition, concrete is hygroscopic, so its structure absorbs a large amount of earth and moisture. For this reason, the material needs effective and reliable protection that can reduce the negative impact of these factors. Since most of the finishing materials react poorly to moisture, for these purposes it is recommended to buy concrete paint for exterior work, which has the appropriate performance conditions.
The use of such paint will improve the decorative properties of concrete, extend its service life, hide minor irregularities and defects on the surface, as well as provide protection from moisture and biological factors.
First of all, high-quality coating should be resistant to moisture. Due to this, the walls of the room will remain dry. High fire safety and stability before burning in case of sudden ignition is another important criterion to which attention should be paid.
Adhesive properties reflect how well the dye is fixed on the surface. The higher this indicator, the longer the paint layer will remain on the base. If the composition has low adhesion, the finish will very quickly begin to peel off and peel off. High resistance to direct sunlight is also important. If the coating does not resist UV, the surface will quickly lose color and burn out.
Helpful advice! If the building is located in a region with difficult climatic conditions, it is better to choose the most expensive and high-quality dye. The budget version of the paint will not be able to provide the necessary protection, and the alteration of concrete painting works will be much more expensive than buying a good composition.
Since concrete structures are operated outdoors, consideration should be given to such a criterion as the operating temperature range. A sharp change in weather conditions may affect the service life and appearance of the coating, so it is recommended to use concrete paint on the street, which is able to withstand heat and frost without losing its operational properties. The minimum required interval is in the range from -40 to + 40 ° C.
This property of the dye, as vapor permeability, provides access of oxygen to the surface, thereby eliminating the likelihood of condensation on the walls. Most of the qualitative compositions also show resistance to mechanical loads, which increases the service life of the coating.
Finishing materials for facades perform two functions at once: decorative and protective. High-quality coating is able to maintain its properties and characteristics at very low and high temperatures. Some finishes are perfectly used at temperatures ranging from -60 to +800?
In exterior facade paint for outdoor use, there is a wide range of applications:
- basement structures;
- concrete walls;
- external and internal piping systems.
The average consumption of the dye on the concrete surface is 250-650 g / m ?. This indicator depends on the type of composition. Other aspects depend on the type of finishing material. For example, an epoxy coating group has the highest resistance to mechanical stress. The use of silicone, polysilicon, silicate or acrylic paint for concrete for exterior work requires careful preparation of the base, it must be dry and clean.
Paints and varnishes for finishing the facade of buildings increase the insulating properties of the base, as well as provide protection from the effects of water, an aggressive alkaline environment and oxidative processes. Quality coating is not inclined to accumulate pollution and can be used for at least 7 years.
Helpful advice! If there is a need for environmentally friendly and fire resistant coating, experts recommend the use of water-based dyes. These compounds are diluted with water and do not react to an alkaline environment.
By the method of dissolving the dyes for facades are divided into two groups:
- Water soluble.
- Compounds for dilution of which solvents are used.
Water soluble dyes are made on the basis of synthetic resins. Also, in the composition there are additional additives, coloring pigments, fillers. Finishing materials that dissolve in water have a high throughput. They show resistance to ultraviolet radiation, temperature extremes and mechanical loads. The average service life of such a coating is 10 years.
Compounds that are diluted with organic solvents can be applied to the surface at almost any temperature. Even high humidity is not an obstacle. The solvent is usually used xylene, solvent or white spirit. Such coatings are not without drawbacks. These dyes contain toxic substances and are highly flammable. For this reason, formulations for the dilution of which solvents are used are less popular.
Water-based dyes are an extensive group of finishing materials. Epoxy compounds containing hardeners and resins have the highest performance parameters. Coloring can be done at almost any temperature. In this case, the finishing material can also serve as a primer composition. Over time, epoxy paints do not lose color.
The coating does not react with chemical components and does not pass moisture. Epoxy dyes also have disadvantages. These enamels are presented in the form of two components that must be thoroughly mixed before application. Re-staining is complicated by differences in the color of the front paint, which is obtained after mixing, and that which has already been applied to the surface. In addition, the finish emits harmful substances.
Acrylic based compounds are applied to a previously prepared surface. To do this, the concrete must be cleaned dry or rinsed and dried. It is recommended to apply paint for exterior work on plaster, although acrylic compounds have excellent adhesive properties. A high-strength coating is formed on the surface, it is not afraid of the negative effects of natural phenomena, chemicals and biological hazards, such as fungi and mold.
Water emulsion dyes practically do not contain toxic substances. They form a dense protective coating on the surface in the form of a film. Using latex facade paint, as one of the subspecies of water-emulsion materials, you can get a coating with water-repellent properties.
Helpful advice! In addition to the primer, on surfaces that are exposed to high humidity, it is recommended to additionally use a hydrophobic agent.
Water-based dyes are easy to use, they are in high demand from buyers.
These compounds have many advantages:
- quick drying;
- the absence of harmful substances in the composition;
- the smell of the dye quickly disappears;
- To adjust the color of the facade paint, special colors are used, which allow you to get almost any shade;
- the mixture is applied very simply;
- after use, the paint tools are easy to clean.
The use of water-based paints has certain limitations. Coloring can be carried out only at a temperature above 0? С.
According to the type of base, water-based dyes are divided into the following types of compositions:
- Silicone – for the manufacture of applied silicone resin. This type of coating is characterized by high vapor permeability. In addition, silicone paints do not contribute to the development of fungus.
- Mineral – as a basis cement or lime is used. The material does not have high resistance, but it is convenient to use.
Mineral paint for facades is suitable for finishing brick surfaces. Due to the presence in the composition of the cement, the dye has such properties as vapor permeability and water resistance.
When the work is finished, immediately rinse the entire instrument with clean water until the dye is dry. The coating does not require special care, but the first wet cleaning is not recommended to be performed earlier than 7 days after dyeing. The use of soap solutions for surface cleaning and antiseptic agents is allowed.
You should not save when buying a dye, most of the qualitative compositions for concrete presented on sale, have a high price, which is justified by high performance and technical characteristics.