Biziwe

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 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.

32 Bult Street

Rustenburg

0300

South Africa