Shotcrete concrete is concrete or mortar conveyed through a hose and pneumatically projected at high velocity onto a surface, as a construction technique. It is typically reinforced by conventional steel rods, steel mesh, or fibers.
Shotcrete is usually an all-inclusive term for both the wet-mix and dry-mix versions. In pool construction, however, shotcrete refers to wet mix and gunite to dry mix. In this context, these terms are not interchangeable.
Shotcrete is placed and compacted at the same time, due to the force with the nozzle. It can be sprayed onto any type or shape of surface, including vertical or overhead areas.
Shotcreting is a mixture of sand, cement and aggregate upto 12mm size which is spread on the rock surface with the help of shotcrete equipment. Synthetic polyester fibres also added to enhance the cohesion and to reduce the shrinkage cracks. This is a very effective and flexible rock support system. This is highly economical compared to conventional steel support or concrete lining. When shotcrete is spread / applied with pressure on the jointed / fractured rock strata, it fills the openings like cracks, fissures, joint planes and helps in minimizing the rock displacement by way of rock mass with shotcrete. Due to exposure of rock mass to moist air and / or ground water, the rock strata gets weathered over a period of time. The weathering and more deterioration in rock strata can also be stopped by sealing the exposed rock surface with shotcrete.