The present invention discloses a high-modulus
asphalt mixture based on an old
pavement milling material, and a preparation method thereof, and belongs to the technical field of
road engineering, wherein the high-modulus
asphalt mixture comprises the following raw materials by
mass: 35-75% of the lean oil coarse component (particle size of greater than 4.75 mm) in an old
pavement milling material,25-65% of the rich oil fine component (particle size of less than 4.75 mm) in an old
pavement milling material, 0.1-2% of a modification regeneration agent, 0-20% of new aggregate, 0-3% of ore
powder, and 0-3% of new
asphalt. According to the present invention, the high-modulus asphalt mixture prepared through the method has advantages of high modulus, excellent
mechanical property, good anti-rutting ability, good durability and good water stability; the 100% recycling of the lean oil coarse aggregate in the old
asphalt pavement milling material and the 100%
resource utilization of the rich oil fine aggregate are achieved, and the potential value of the old
asphalt pavement milling material is completely provided; and the super-long service life, the
safe driving and the economy of the pavement are achieved.