WHAT IS SHOTCRETE? TYPES OF METHOD, PROCEDURE, APPLICATION AND ADVANTAGES.

 SHOTCRETE


Shotcrete, gunite or sprayed concrete is concrete or mortar which is conveyed through a hose pipe and pneumatically sprayed at high velocity onto a surface. It is typically reinforced by conventional steel rods, steel mesh, or fibers.

Shotcrete is placed and compacted/consolidated at the same time, due to the force with which it is ejected from the nozzle. It can be sprayed onto any type or shape of surface, including vertical or overhead areas.

TYPES OF SHOTCRETE METHOD :

Shotcrete term can be used for both the wet-mix and dry-mix method but In pool construction, shotcrete refers to wet mix and gunite to dry mix. 

1. Dry mix : The dry mix method involves placing the dry ingredients into a hopper and then conveying them pneumatically through a hose pipe to the nozzle.

2. Wet mix : Wet-mix shotcrete involves pumping of a previously prepared or mixed concrete, typically ready-mixed concrete, to the nozzle. Compressed air is introduced at the nozzle to propel the mixture on the surface.

PROCEDURE :
All materials with exception of accelerator are combined within a batch/mix plant, transported via positive displacement pump to a nozzle where accelerator is introduced into the streamfeed and then immediately sprayed onto the target surface with a velocity developed by compressed air under a pressure of 90 - 100 psi.


APPLICATION :
  1. It is used to reinforce both temporary and permanent excavations.
  2. It is commonly used to line tunnel walls, in mines, subways, and automobile tunnels.
  3. It is used to stabilize an excavation for an underground parking structure.
  4. It is very useful for hard rock mining.
  5. It is used to restoration and repairing of old building and fire-damaged structure.

ADVANTAGES OF SHOTCRETE :
  1. Shotcrete can develop the required strength for the final product.
  2. Shotcrete makes critical paths safe from any ground fall.
  3. Shotcrete swimming pools are typically more durable and longer lasting than poured concrete.
  4. Shotcrete allows for customization in shape, depth, and styles that are not typically available in traditional methods.
  5. The shotcrete process requires less formwork and can be more economical than conventionally placed concrete.

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