Recycled hot asphalt mixture production method

A production method of a recycled hot asphalt mixture obtained by mixing a recycled aggregate, a new aggregate, asphalt, and an additive for recycle, comprising:

• heating the additive for recycle;
• adding water to the heated additive for recycle and mixing thereof so as to make the additive for recycle pre-foamed without presence of the asphalt and to make the additive for recycle a foamed state before mixing the additive for recycle into asphalt;
• and
• adding the additive for recycle in the foamed state to the recycled aggregate, the new aggregate, and the asphalt and mixing thereof,
• wherein the additive for recycle is at least one selected from a group consisting of an asphalt-based additive for recycle, a petroleum-based additive for recycle, a mineral-based additive for recycle, animal/plant oil-based additive for recycle, and an asphalt emulsion-based additive for recycle, and
• when making the additive for recycle the foamed state, a heating temperature T (a unit of ° C.) of the additive for recycle and an addition amount W (an addition amount with respect to the additive for recycle of 100 wt %, a unit of wt %) of the water added to the heated additive for recycle satisfy the following relations (1) to (3)
• 105≦T≦240 (1)
• 0.5≦W≦10 (2)
• W<0.06×T−2.4 (3).