Look up: shotcrete

1. 
   Shotcrete
   `Shotcrete` and `gunite` are two commonly used terms for substances applied via pressure hoses. Shotcrete is mortar or (usually) concrete conveyed through a hose and pneumatically projected at high velocity onto a surface. Shotcrete undergoes placement and compaction at the same time due to the force with which it is projected from the nozzle. It can be impacted onto any type or shape of surface, including vertical or overhead areas.
   Found on http://en.wikipedia.org/wiki/Shotcrete
   
   
2. 
   shotcrete
   concrete applied by spraying. Shotcrete is a mixture of aggregate and portland cement, conveyed by compressed air to the nozzle of a spray gun, where ... [2 related articles]
   Found on http://www.britannica.com/eb/a-z/s/87
   
   
3. 
   Shotcrete
   Mortar or concrete conveyed through a hose and projected pneumatically at high velocity onto a surface; dry-mix shotcrete (gunite), and wet-mix shotcrete.
   Found on http://www.moxie-intl.com/glossary.htm