The machine works on a dry mix principle. The material is duly filled into the feeding hopper from where it falls into the chamber of revolving rotor. The mix is then transported in a continuous process to the air chamber; from there it is blown by the compressed air stream through the hose to the spraying nozzle, and to the application area respectively. Water is added to the dry concrete in the nozzle at the end of the conveying hose pipe. The machine is driven by electric motor.