18 Sep Concrete anti -corrosion protection – the key to the strength of any structure
All building materials in contact with the external environment feel its negative effects. A complex of physical and chemical factors, such as daily temperature changes, carbon dioxide, which is always present in the atmosphere, the effect of precipitation representing a mixture of water and a number of salts inevitably provoke corrosion. Concrete is also subject to corrosion, its protection is the key to reliability of the entire structure.
The occurrence of corrosion.
The capillary-porous base of concrete made using classical technology, by mixing sand, gravel, cement and water, is greatly affected by adverse factors, although hydrophilizers are used in the production of concrete. Under the influence of adverse factors in the porous formation, crystals occur, their growth causes the formation of cracks. Salts of sulfuric, salt, coal and other acids, which are in a significant concentration in the atmosphere, also show a destructive effect on construction devices.
Types of spontaneous destruction of structures.
Spontaneous destruction of concrete is usually combined. There are gas, atmospheric and chemical types of corrosion. The result is a deterioration in properties up to the complete destruction of the functionality of the structure.First, the constituent parts of concrete are eroded and washed out, then elements are formed that do not have astringent properties, in the final there is an accumulation of poorly soluble crystallizing salts that destroy the very structure of concrete.
Concrete protection and corrosion control.
In order to protect concrete and increase its durability, you should use primary and secondary protection.Primary protection is carried out by adding a variety of modifying additives, which do not allow the material to be divided – stabilizers, create an increase effect – plasticizers, water retaining, regulating hardening, as well as changing the density and cellularity of concrete.
Secondary protection is the application of a variety of protective coatings:
Destroy and contain fungal formations on concrete structures biocidal materials. Their elements are chemically active, and can also fill microcracks and pores in the concrete structure. Rolls of oil bitumen, polymer coating, polyisobutylene plates are pasting coatings – they are used when exposed to liquid media, for example, flooding with ground water. Sealing impregnations – impart significant hydrophobic properties to concrete, dramatically increase water resistance and reduce water absorption of the material. They are used in conditions of increased humidity and in places where there is a need to ensure special sanitary and hygienic requirements.
Lacquer and acrylic coatings – will create a weather-resistant, strong and durable protection. The polymer film formed by acrylic prevents damage well. This method additionally protects the structure from mold and fungi.Paint coatings based on mastic – used when exposed to liquid media and in direct contact of concrete with a solid aggressive environment.
Anti-corrosion mixtures can be used wherever there is a similar need for concrete. Structures made of this material are found in the floors and walls of residential locations, foundations, garage complexes, greenhouses, treatment buildings, pipelines. The choice of a complex of means depends on the characteristics of the influence of the environment, physical and chemical effects are possible.
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