kuivasekoitusruiskubetonointi

Kuivasekoitusruiskubetonointi, often referred to by its Finnish name, is a method of applying concrete in which the dry components of concrete are mixed with water at the nozzle just before spraying. This technique differs from wet-mix shotcreting where the concrete is fully mixed before being transported to the nozzle. In the dry-mix process, cement, aggregates, and additives are pre-mixed in dry form and then conveyed through a hose to the spraying nozzle. At the nozzle, water is introduced under pressure, and the mixing occurs as the material is propelled at high velocity onto the surface.

The primary advantage of kuivasekoitusruiskubetonointi lies in its simplicity and the ability to control the water-cement ratio at the point of application. This allows for adjustments based on ambient conditions and the substrate being sprayed, potentially leading to improved adhesion and reduced rebound (material that bounces off the surface). The dry mix is also easier to transport over longer distances, making it suitable for applications where site access is challenging. However, controlling the precise mixing of water at the nozzle requires skilled operators to ensure consistent concrete quality and performance. This method is commonly used in tunneling, slope stabilization, and repair work.