SPRAYED CONCRETE
Sprayed concrete has been used till 50 years and also used for renovation. It is used both for effective repairs and for new constructions. The sprayed concrete forms and excellent bond with itself, concrete and masonry. Pressure on the substrate according to its own momentum in the strong-intensive products have good resistance to corrosion and weathering. This lack of access and low water-cement ratio a series of effective application provides a solid concrete.
In many cases, the injection of concrete, the concrete strength and permeability properties of the traditional outside. Elimination of the form, as well as the speed of the application, and a small access requirements and ability to get sprayed over 200 meters, from the application point of view, at a significant cost savings over other technologies machines and materials. As more and more structural loads, this technology has been proven to be particularly suitable for the strengthening of bridges, tunnels, canals Sprayed concrete is often referred to as Gunite (dry mix) or Shotcrete (wet mix). Spraying process was developed in 1895, and in the early 1900s, commercially available. Material in dry or semi-dry state, using compressed air nozzles, water was added and mixed to hydrate before the concrete is applied to the substrate at a speed transport. Gunite commercial development in general use until 1970, after the 2nd World War, . Concrete mix is provided in the form of a wet, and it is pumped to the spray nozzles, air is added to the concrete onto the substrate. Use of accelerator added at the nozzle helps in the application of the specific case of the overhead or in the ground support and the tunnel to increase the early strength gain requirements.
SPRAYED CONCRETE : concreting without formwork
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