To solve the problem of a current final disposal place and to take in advance the future subject of material circulation by using used tires as surface material of pavement instead of asphalt.

Power of the crushed used tires for the like is measured and piled in a hopper 4 of a heat mixer. The powder is thrown in a rotary kiln 1 main body from the hopper by a screw conveyer 5, and heated while being stirred at 100 to 200°C. A tape heater is wound round the rotary kiln, and the temperature is automatically controlled. When gum is sufficiently softened, the material is discharged by a discharge chute 9, piled on a dump truck through a belt conveyer 10, and quickly spread on a roadbed in a construction site. Thus, while the material is kept hot before the temperature drops below 100°C, spreading, flattening and roll are ended to complete a surface layer.