Sprayed concrete is a concrete which is delivered to the point of installation in a sealed, pressure-resistant hose or pipe, applied by ‘spraying’ and this method of application also compacts it simultaneously.
Sprayed concrete has a wide application range due to its high flexibility, good economics and good physical properties. However, the sprayed concrete method is requiring a high degree of mechanization and well trained nozzle operators. Nevertheless, the advantage over conventional concreting methods is outstanding: the application of concrete without any formwork.
Sprayed concrete is mainly used in the following applications:
- Excavation stabilization in tunneling and mining
- Trench and slope stabilisation
- High performance linings
- Repair and refurbishment works
Class J1 sprayed concrete is appropriate for application in thin layers on a dry substrate. No structural requirements are to be expected in this type of sprayed concrete during the first hours after application.