HOT-MIX ASPHALT MIXTURE REINFORCED BY FIBER AND METHOD FOR MANUFACTURING THE SAME

摘要

PURPOSE: A manufacturing method of a fiber reinforced hot asphalt mixture is provided to increase an engagement tension between aggregates of the hot asphalt mixture and to induce a bridge effect by uniformly mixing thermoplastic PET(PolyEthylene Terephthalate) fibers. CONSTITUTION: A fiber reinforced hot asphalt mixture(1) comprises a plurality of PET(PolyEthylene Terephthalate) fibers(2). The PET fibers has a melting point of 250-260C, a tensile strength of 2,500-10,000kgf/cm, a tensile elongation of 10-20%, a coefficient of elasticity of 30,000-300,000kgf/cm, and a specific gravity of 0.80-0.95. The PET fibers have a thickness of 0.3-0.5mm, a length of 25-30mm, and a width of 0.8-1.1mm. The PET fibers are mixed at a ratio of 0.2-0.8wt%. A manufacturing method of a fiber reinforced hot asphalt mixture comprises the steps of: packing a plurality of PET fibers with a polymer packing material having a melting point of 130C or less to prepare PET fiber bundles; putting the PET fiber bundles into a plant mixer along with an aggregate to perform dry-tempering; and putting an asphalt binder into the plant mixer and mixing the PET fibers and the aggregate to the asphalt binder through a heating process. In the third step, a temperature for the heating is higher than the melting point of the polymer packing material of the PET fiber bundles.