Shotcrete and gunite are forms of pneumatically-applied concrete, typically reinforced with steel rods, steel mesh, or fibers. Shotcrete is placed and compacted simultaneously with the force from which it exits the hose.
Shotcrete is known for having additional benefits over form-poured concrete, such as higher strength, low permeability, and high durability. These attributes can be further enhanced by adding addatives into the mix such as silica fume, air-enttraining admixtures, fibers, and accelerators.