Shotcrete, also known as gunite or sprayed concrete, is a concrete application method where concrete is pneumatically projected at high velocity onto a surface, such as a wall or tunnel. It can be applied over irregular surfaces without formwork and self-compacts, making it suitable for domes, tunnels, bridges, dams, and other structures. There are two main methods: dry mix, where materials are mixed on-site; and wet mix, where materials are premixed and pumped through a hose. Shotcrete has advantages over traditional cast-in-place concrete like reduced formwork costs, ability to cover irregular surfaces, and faster construction. Fiber-reinforced shotcrete can replace rebar, improving safety

1. SHOTCRETE

2. Shot Crete
or
Gunite
or
Sprayed concrete

3. Definition
A concrete delivered to the final
point of placing in a sealed pressure
resistant hose (or) pipe and applied no
frame work and self compact

5. INTRODUCTION
• Shot Crete technology is providing services to the
industry since 1979.
•The development of this technology have been
presented by Rose(1985), Frazen (1992) and
Morgan(1993).
• Shortcreting has proved to be the best method for
construction of curved surfaces.
• Domes are now much easier to construct with the
advent
of with this shot Crete technology.
• Tunnel linings are also becoming easy technology.

6. This method is used in Head walls
Bridges, Dams
Head walls
Retaining walls , Docks
Retaining walls
Docks

7. Properties of the shotcrete depends
not only on the material proportions
etc. But also on skill nozzle man in
other words workmanship is of
critical importance n quality control
plan

8. Methods of Shot Crete
1.Dry Mix process
2. wet mix process

11. Advantages of Dry process:
• Easy start up, shutdown and clean up.
• Control of materials is on site.
• Nozzle man can be up to 1000ft
horizontally or 500ft vertically from the gun.
• Widely used in mining

14. Advantages of Wet process:
• Little or no formwork is required.
• Cost effective method for placing concrete.
• Ideal for irregular surface applications
• Allows for easier material handling in areas with
difficult access

15. Fiber Reinforce shotcerte
1.Steel synthetic fibers dispersed homogenously in
shotcrete
2.Impart sufficient ductility
3. Have become cost compare with other form of
reinforcement
4. Impact better safety easy to use benefits than the
traditional reinforcement

18. Characteristics of Shot Crete
 Low water – cement ratio(especially for the dry process)
 High early strength and use of accelerators
 Rebound of material of placement
 Reduced cost on account of saving from formwork

19. Conclusion
The use of Shotcrete to build new concrete structures as
well as to restore and repair existing structures is well
known and documented and it is perhaps the most diverse
method available for concrete construction. The use of this
innovative technology is increasing day by day and
procedures for its proper performance are well developed
and high quality work is regularly obtained.