The fiber compound line named HA.FIBERBIT is in pellets of cellulosic, mineral and/or synthetic nature. They stabilise and structure the draining, semi-draining and SMA-type (SplittMastix Asphalt) asphalt mixes thickening the bitumen and giving the resulting road surface a particularly performant, stable and resistant effect. The improvement in mechanical performance involves a more durable road paving that will develop a more efficient resistence of traction, fatigue, thermal excursions, and will present a higher stiffness module.