Truss screed is a common concrete machine. It is usually used in various , compactness and mudding project of concrete road. Central polarization system is used in this machine, the strength of vibratory force is adjustable, slurry and effects are excellent. Screed is quite simply a thin, top layer of material laid over a concrete subfloor, that is traditionally made of sharp sand and cement, similarly to concrete. Industrial screed can be used for more heavy duty applications by using a more coarse 6-10mm aggregate .Screed is a thin layer of material that is placed on top of a concrete subfloor. Usually, screed consists of cement and sharp sand, but where a more industrial version is required, coarse aggregates can be added to create a thicker layer.