Definition
Spray-applied concrete is a repair and construction method where concrete or mortar is pneumatically projected at high velocity onto a prepared surface. It is commonly used for structural repairs, reprofiling, strengthening, and reinstatement of damaged reinforced concrete.
Explanation
The process uses compressed air to apply material directly onto vertical, overhead, or irregular surfaces where traditional form-and-pour methods may be difficult or inefficient. The impact velocity helps compact the material and improve bond strength with the existing substrate.
Spray-applied concrete can be used for bridge repairs, tunnels, retaining walls, basements, marine structures, and large concrete frames. It is particularly effective where significant breakout and reinstatement are required.
Depending on the application method, spray-applied concrete may be classified as shotcrete or gunite. Proper surface preparation, reinforcement treatment, and material selection are essential to achieve long-term performance and compliance with repair standards such as BS EN 1504.
Why It Matters
Spray-applied concrete enables efficient, durable structural repair in challenging access conditions. It reduces downtime, improves bond performance, and provides a practical solution for large-scale concrete reinstatement projects.