- Jan 08
The gunite coating method
The Gunite coating Method is also used for repair and restoration work on damaged surfaces of concrete, reinforced concrete structures. The gunite coating or shotcrete method consists in the fact that a cement-sand mortar (shotcrete), concrete is applied under pressure to the reconstructed surfaces.
The gunite coating is used in the construction of thin-walled reinforced concrete structures (shotcrete of walls, shells, vaults, tanks, foundation shotcrete, etc.), finishing in tunnels, waterproofing and sealing joints of prefabricated structural elements, repair and strengthening of concrete and reinforced concrete structures and products, etc.
The gunite coating (lat. tor- “plaster” + cret- “compacted”) – applying a layer of concrete or other mortars (plaster, clay) to the surface of concrete or reinforced concrete structures. The solution (shotcrete mass) is applied under compressed air pressure, as a result of which cement particles closely interact with the surface of the structure, filling cracks, shells and the smallest pores.
Shotcrete coating is characterized by high mechanical strength, density, water resistance and frost resistance. Depending on the fineness of the filler, mortar shotcrete mixtures are distinguished (fraction size up to 2.5 mm); shotcrete (up to 10 mm) and syringe concrete, or sprayed concrete (up to 25 mm). Also, the surface gunite coating is carried out much faster than the repair mixtures usual non-mechanized application.
In modern construction, gunite coating is performed by two methods: dry gunite coating and wet gunite coating.