What is the meaning of shotcrete? Shotcrete refers to concrete or mortar that is sprayed onto a surface at high velocity using a hose. It is typically applied using compressed air to create a dense, strong layer that adheres to various surfaces. Shotcrete can be applied in two forms:

　　1. Wet-Mix Shotcrete: The concrete is premixed with water before being pumped through the hose and sprayed onto the surface.

　　2. Dry-Mix Shotcrete: The dry mixture of cement and aggregate is conveyed through the hose, and water is added at the nozzle just before application.

　　Shotcrete is commonly used in construction projects such as tunnel linings, retaining walls, swimming pools, and structural repairs due to its versatility and ability to form complex shapes.

　　Why is it called shotcrete?  The term shotcrete is derived from the method used to apply the material. It combines the words "shot" (referring to the way the material is sprayed or shot onto a surface) and "concrete" (the material being applied).

　　Shotcrete is a type of concrete that is pneumatically projected at high velocity through a hose onto a surface. It bonds strongly and quickly, making it ideal for applications like tunnels, retaining walls, swimming pools, and structural repairs.

　　The technique was originally patented in 1911 by Carl Akeley under the name "cement gun" process, and over time, the industry adopted the name "shotcrete" for this unique method of concrete application.