Methods for protecting concrete from corrosion

Aggressive environment affects the state of building materials. Effects of salts, carbon dioxide, water and temperature extremes (frost-thaw cycles) often lead to corrosion. Therefore, the protection of concrete against corrosion - the most important task in the construction or operation of any facilities. Causes of corrosion of concrete produced at the mineral-based, has a capillary-porous structure and exposed to the highest exposures in comparison with other materials. As a result of inclement weather in its porous structure of the crystals are formed, the increase of which leads to cracking. Carbonates, sulfates and chlorides, dissolved in large quantities in the air, also having a devastating impact on building designs. Types of Corrosion Corrosion of concrete is divided into three types. The main criterion of this classification is the degree of deterioration of its characteristics and properties. First degree - leaching of components of concrete; second degree - education corrosion products without binding properties; Third degree - the accumulation of soluble salts crystallizing, which increase the volume. Protection methods to protect the concrete and increase its durability, you should use primary and secondary protection. Methods for primary protection is the introduction of various modifiers. They may be plasticizer (increases), the stabilizing (warning bundle), water-retaining, as well as regulatory setting concrete mix, density, porosity, etc. The methods of secondary protection is application of different kinds of protective coatings: biocidal materials - destroy and inhibit the formation of fungal on concrete structures. The principle of operation is the penetration of reactive elements in the concrete structure and the filling of cracks and pores. Okleechnye cover - used when exposed to liquids (for example, if a concrete pile flooded by groundwater), in soils, as well as an impermeable sub-layer in coatings. This may be rolls of bitumen, plastic film, poliizobutilenovye plates, etc. Sealing impregnation - give concrete high hydrophobic properties, dramatically increase the water resistance and reduce water absorption of the material. Because of these properties they are used in high humidity and in areas where there is need for special hygienic requirements. Acrylic paint and coatings - form a weather-resistant, durable and long lasting protection. For example, acrylic prevents the destruction, creating a polymer film. Another advantage of this method of corrosion control is to protect the surface from fungi and microorganisms. Paintwork mastic coating - used when exposed to liquid media, as well as by direct contact with a solid concrete aggressive environment. Corrosion-resistant coating can be applied wherever there is such a need for concrete. Construction of this material are found in floors and walls of dwellings, basement, garage complexes, greenhouses, hothouses, sewage treatment plants, reservoirs. Also, when selecting protective equipment you should take into account features of exposure, the possible physical and chemical effects.