What is Shotcrete?
Definition of Shotcrete:
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Shotcrete is a method of applying concrete or mortar by spraying it at high velocity onto a surface. The American Concrete Institute (ACI) officially defines it as “mortar or concrete pneumatically projected at high velocity onto a surface”. The process results in a dense, strong, and durable concrete layer.
Key characteristics
- High-velocity placement: The concrete mixture is projected from a nozzle with compressed air, which consolidates the material upon impact. This eliminates the need for vibration to compact the concrete.
- No formwork required: Because the material is self-compacting, shotcrete can be applied to vertical or overhead surfaces and molded into complex shapes without needing extensive formwork.
- Excellent bonding: The high velocity of the spray ensures a strong bond with most substrates, making it ideal for both new construction and repairs.
- Durability and strength: The final product has a high compressive strength, low permeability, and resistance to water and frost.
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At Premier Gunite of Wisconsin, we exclusively employ ACI Certified Nozzlemen and ACI Certified Shotcrete Inspectors on our sites.
Shotcrete is a method of applying concrete or mortar that is pneumatically projected, or sprayed at high velocity, onto a surface. The force of the spray compacts the material, allowing it to be placed and consolidated in one step, even on vertical or overhead surfaces.
This application method results in a dense, durable, and strong concrete with excellent bonding properties. Shotcrete is ideal for creating complex or curved structures with little to no formwork, and it can be used for both new construction and repairs.
Shotcrete vs. Gunite
Though often used interchangeably, “shotcrete” is the official generic term for pneumatically applied concrete. The primary difference lies in how the water is added to the mix:
- Wet-mix (Shotcrete): All ingredients, including the water, are mixed together before being pumped through the hose. Air is added at the nozzle to propel the mixture onto the surface.
- Dry-mix (Gunite): The dry sand and cement mix is sent through the hose with compressed air, and water is injected at the nozzle just before the material is sprayed. The dry-mix method allows for more control over the water-to-cement ratio at the nozzle, which can be advantageous for certain applications.
Common applications
Shotcrete is a versatile technique used for a wide variety of construction projects:
- Structural reinforcement: Repairing and strengthening existing structures like dams, bridges, and foundations.
- New construction: Creating walls, foundations, and floors for new buildings.
- Shaping complex forms: Building features like swimming pools, tunnels, skate parks, and decorative water features.
- Excavation and slope stabilization: Lining and supporting underground tunnels, mines, and excavated slopes.
- Water-retaining structures: Constructing or lining canals, reservoirs, and tanks.
Contact us at: 715-382-4296 or email: travis@premiergunitellc.com
Servicing the U.S.A.