Asphalt composition

A method of producing an asphalt composition, the method comprising

• Step 1:
• a step of subjecting a polyethylene terephthalate, an alcohol component containing an alkylene oxide adduct of bisphenol A, and a carboxylic acid component to a polycondensation reaction in the presence of an esterification catalyst to obtain a polyester,
• wherein the polyester has a molar ratio (B)/(E) of a structural unit (B) derived from the alkylene oxide adduct of bisphenol A and a structural unit (E) composed of ethylene glycol and terephthalic acid derived from the polyethylene terephthalate of 30/70 or more and 95/5 or less, and
• Step 2:
• a step of mixing an asphalt with the polyester obtained in the Step 1, to obtain an asphalt composition having a ratio (P)/(A) of a mass proportion (P) of the structural unit derived from the polyethylene terephthalate in the polyester to an asphaltene content (A) in the asphalt of 0.15 or more and 3.5 or less.

A method of producing an asphalt mixture, the method comprising

• Step 1:
• a step of subjecting a polyethylene terephthalate, an alcohol component containing an alkylene oxide adduct of bisphenol A, and a carboxylic acid component to a polycondensation reaction in the presence of an esterification catalyst to obtain a polyester, wherein the polyester has a molar ratio (B)/(E) of a structural unit (B) derived from the alkylene oxide adduct of bisphenol A and a structural unit (E) composed of ethylene glycol and terephthalic acid derived from the polyethylene terephthalate of 30/70 or more and 95/5 or less, and
• Step 2:
• a step of mixing a heated aggregate, an asphalt, and the polyester obtained in the Step 1, to obtain an asphalt mixture having a ratio (P)/(A) of a mass proportion (P) of the structural unit derived from the polyethylene terephthalate in the polyester to an asphaltene content (A) in the asphalt of 0.15 or more and 3.5 or less.