Wet-mix shotcrete pumps are used to pump concrete (typically ready-mixed concrete) to the nozzle. Compressed air is then introduced at the nozzle to impel the mixture onto a receiving surface. Compared to the dry-mix process, the wet process produces less rebound waste (when material falls to the floor), less dust and can place larger volumes in less time. The force used to eject shotcrete from the nozzle places and compacts/consolidates at the same time enabling it to be sprayed onto any type or shape of surface – including vertical or overhead areas.