Shotcrete

Areas of application as well as advantages and disadvantages of different process technologies

Shotcrete is a type of concrete that is transported through a hose to the application site, where it is pneumatically sprayed from a nozzle and compacted by the impact energy. The production and use of shotcrete are regulated by the European standard DIN EN 14487 and the national application standard DIN 18551.

Shotcrete is primarily used for: Repair and reinforcement of concrete structures - Ground and rock stabilization - Temporary support on large construction sites - Tunnel construction (shotcrete method) - Creating natural-looking surfaces in recreational and sport climbing facilities.

Shotcrete is available in bagged or silo form. Depending on the application, you will need: Material delivery machine (concrete pump or dry spraying machine) - Delivery hose - Shotcrete nozzle - Protective clothing
- Material delivery machine (concrete pump or dry spraying machine)
- Delivery hose
- Shotcrete nozzle
- Protective clothing

Dry Spraying Method
In the dry spraying process, the material is pneumatically transported in an oven-dry state to the nozzle. Water is added at the nozzle to achieve the necessary moisture level.

Wet Spraying Method
In the wet spraying process, the material is pre-mixed and moistened before being pumped to the nozzle using a concrete pump. At the nozzle, air and chemical additives are introduced to achieve the required compaction.

Advantages
Continuous availability of shotcrete material - Quick setup and dismantling - Simple machine technology enables fast deployment - Lower maintenance and cleaning effort for machines and hoses - Thin-stream process allows for higher material compaction

Disadvantages
Conventional dry spray nozzles struggle to achieve a homogeneous mix - High material velocity makes uniform mixing difficult - This issue can be eliminated by using our innovative shotcrete nozzle with a post-mixing chamber Durch die Verwendung unserer innovativen Spritzbetondüse mit Nachmischkammer lässt sich dies jedoch beseitigen.

Advantages
Allows for significantly higher material output - While dry spraying is limited to approximately 6-8 m³, wet spraying can achieve 3-4 times that amount

Disadvantages
Heavier and more complex equipment leads to longer setup and dismantling times.
Hoses must always be cleaned after use, increasing workload. Dense-stream process limits transport distances for the material.