What is shotcreting?
Shotcreting refers to a process in which compressed air forces mortar or concrete through a hose and nozzle onto a surface at a high velocity and forms structural or non-structural components of buildings. It is also known as spray concrete as the force of jet impacting on the surface compacts it so as to make itself supporting.
Generally these are used for concreting or plastering wall at difficult terrain or difficult-to-reach places (generally at height). Also, it is used where plastering or wall has to be done at rapid speeds. Such sites could be Tunnel.