Product for improving the rheological, chemical and physico-chemical characteristics of bituminous binders, characterized in that it comprises at least one tall oil derivative (TO) or tall oil taken from the group consisting of a distillate TOFA (Tall Oil Fatty Acid) of TO essentially consisting of TO fatty acids; a distillate TOR (Tall Oil Resin) of TO essentially consisting of acids and resin derivatives of TO; a TOP (Tall Oil Pitch) distillation residue from TO essentially consisting of pitch or pitch of TO.
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