Utilizing Shotcrete and Gunite for
Infrastructure Rehabilitation
Shotcrete/Gunite
Pneumatically applied mixture of
cement, aggregate, and water
conveyed through a hose and
projected at high velocity onto
the application surface.
Bridges / Dams
• Sewer
• Sanitary
• Storm (Culverts / Basins)
• Headwalls / Wing Walls
•
•
•
•
•
Piers / Docks
Ditches
Retaining Walls
Scope Stabilization
Definition of Wet Mix Shotcrete
Shotcrete in which all of the ingredients, except
accelerator, are mixed before introduction into
the delivery hose.
Shotcrete (Wet Mix)
Accelerator, if used, is added to the shotcrete
mixture at the nozzle in such a way that the
quantity can be properly regulated and
monitored.
Pre mix blend of dry cement and aggregate is
propelled through a hose by compressed air to
a nozzle.
Gunite Equipment
Dry Mix: Water is added to the cement/aggregate
mixture at the nozzle and the mixed ingredients are
projected onto the application surface.
Accelerators can be added at
the nozzle when required.
• Fibers (Steel or Poly) can also be
used.
•
• Portland Cement
• Water
• Sand
• Admixtures / Fibers
Difference : ???
• Portland Cement
• Water
• Sand
• Admixtures / Fibers
Difference : Applied via Compressed Air
Typical Application of Shotcrete/Gunite
Typical Benefits of
Repair vs. Replacement:
• Dollar Savings per Project, allows more
projects to be completed!
• Low Impact to Environment
• No Impact to Local Businesses
• No Disruption of Traffic
Rehabilitation of Corrugated Steel Pipe with Shotcrete
Rehabilitation of Brick Sewer with Shotcrete
Uses of Shotcrete
Infrastructure rehabilitation
–Bridges, parking structures, subway tunnels
etc.
Uses of Shotcrete
Bridges - continued
UsesBridges
of Shotcrete
- continued
UsesBridges
of Shotcrete
- continued
Uses of Shotcrete
Infrastructure rehabilitation
– Dams and hydraulic structures (water reservoirs,
canals, spillways, locks, creek stabilization, etc.)
Uses of Shotcrete
Infrastructure rehabilitation
– Marine structures (piers, wharves, sea walls, light
stations, berth faces, dry docks, etc.)
Uses of Shotcrete
Infrastructure rehabilitation
–Strengthening and seismic retrofit
Uses of Shotcrete
Infrastructure rehabilitation
–Retaining Walls
Uses of Shotcrete
Infrastructure rehabilitation
– Retaining Walls (continued)
Shotcrete / Gunite has been used for
nearly 100 years and with the growing
experience and technology, the
industry and application will continue
to expand.