Guniting Equipment

Guniting Hopper refers to the dry-mix process, in which the dry cementitious mixture is blown through a hose to the nozzle, where water is injected immediately before application.. The concrete is blasted by pneumatic pressure from a gun, hence "gun"-ite.
Guniting means blowing dry material out of a hose with compressed air, wetting it as it was released. This was later used to patch weak parts in old buildings. Guniting Hopper or "cement gun" is the equipment used, and "gunite", the material that was produced.
The dry mix method involves placing the dry ingredients into a hopper and then conveying them pneumatically through a hose to the nozzle. The nozzleman controls the addition of water at the nozzle. The water and the dry mixture is not completely mixed, but is completed as the mixture hits the receiving surface. This requires a skilled nozzleman, especially in the case of thick or heavily reinforced sections. Advantages of the dry mix process are that the water content can be adjusted instantaneously by the nozzleman, allowing more effective placement in overhead and vertical applications without using accelerators. The dry mix process is useful in repair applications when it is necessary to stop frequently, as the dry material is easily discharged from the hose.