This type of repair is used when large surface area or beams or columns are encased. Dry processing is employed in this method where dry mix is transferred by a hose and water is added to the dry mix at the nozzle.
Guniting method is actually not suitable for the repair of underwater concrete structures but it can be utilized in slash zones or tidal zones, if rapid setting additives are employed. The maximum thickness of shotcrete is limited to 50mm but in case of thick layer, a second layer can be placed.
The success of this technique depends on skill of the man handling the nozzle and experience in
• Adjusting addition of water
• Pressure of water
• Thickness uniformity