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he difference between shotcrete and plastering, which is also often produced by a mechanical method this is a high degree of compaction due to the use of special equipment and the compressed air pressure of at least 4 at and a volume of at least 3 m3/min. Also, it is necessary to distinguish shotcrete (maximum filler diameter up is to 10 mm) and jetcrete or shotcreting (more than 10 mm graded).
Mechanized wet-mix spraying is the most efficient method for projects with high shotcrete production. It is primarily applied for underground works in order to increase operator safety. The concrete is introduced into the hopper of the concrete pump and transported through the concrete line to the spraying nozzle, where it is mixed with compressed air and accelerator to be sprayed on the substrate.
And concrete pump has the feature of low pulsations for a constant concrete flow. The concrete pump is in charge of conducting the concrete mixture up to the nozzle of the spraying arm. Wet-mix shotcrete is usually pumped with double piston pumps.
The pump design is aimed at minimizing the pulsations and thus the discontinuity of the concrete flow, in order to guarantee a homogeneous application of the sprayed concrete. In this way, the required quality and layer thickness is achieved, and rebound (concrete that does not stay on the wall) is reduced.
Except the pump, there are some Shotcrete Machine commonly needed in the production like Concrete Spray Machine, Beam Bending Machine, Rust Removal Machine, Ditch Forming Machine, Curbing Machine, Canal Making Machine, Ditch Paving Machine and Concrete milling machine.
For shotcrete, there are several necessary conditions such as special shotcrete equipment, which in one way or another provides the movement of the shotcrete mix in the spray nozzle, a source of compressed air to accelerate the shotcrete mix and give it with the necessary speed for subsequent application to the surface and compaction, source of mixing water (for dry shotcrete) and trained specialist-gunman (nozzleman) or the operator of the shotcrete mix application on the surface. The shotcrete mix of a special recipe that takes into account the requirements for the properties of the shotcrete and the features of the shotcrete equipment operation.
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