Shotcrete & Gunite Application 

Shotcrete Application

  • Shotcrete is an all-inclusive term that describes spraying concrete or mortar with either a dry or wet mix process onto prefabricated rebar reinforcing, securing hanging and side walls underground, critical for the safe movement of heavy machinery, workers and material.
  • Shotcrete helps making these paths safe from any ground fall.
  • Wet-mix shotcrete involves pumping of a previously prepared concrete, typically ready-mixed concrete, to the nozzle.
  • Compressed air is introduced at the nozzle to impel the mixture onto the receiving surface.

  • The greatest advantage of the wet-mix process is all the ingredients are mixed with the water and additives required.

  • The wet-process procedure generally produces less rebound, waste (when material falls to the ground), and dust compared to dry-mix process.

  • Compressed air is introduced at the nozzle to impel the mixture onto the receiving surface.

  • The wet-process procedure generally produces less rebound, waste (when material falls to the ground), and dust compared to dry-mix process.

  • The greatest advantage of the wet-mix process is all the ingredients are mixed with the water and additives required.


Gunite Application

  • Gunite refers to the dry-mix shotcrete process. In the dry-mix process the dry sand and cement mixture is blown through a hose using compressed air with water, being injected at the nozzle, to hydrate the mixture immediately before it is discharged onto the receiving surface.
  • The dry-mix method involved 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.

  • This requires a skilled nozzleman, especially in the case of thick or heavily reinforced sections.

  • The water and the dry mixture in not completely mixed, but is completed as the mixture hits the receiving surface.

  • An advantage of the dry-mix process is 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.