Abstract: The present invention relates to hot or warm asphalt mix comprising a granular fraction and a hydrocarbon-based binder, characterised in that the elements of the granular fraction have dimensions between 0 mm and 10 mm, and in that the hydrocarbon-based binder comprises a workability additive, having a melting point above 60° C. and below 130° C., said asphalt mix being resistant to rutting, compact and workable, with a workability, measured with a Nynas workability meter at the working temperature of the asphalt mix, of less than 350N and insulating with a thermal conductivity, ?, of less than 1 W/m·K. It also relates to a road surfacing, in particular comprising an integration layer based on the asphalt mix comprising pipes of a heat exchanger device. It finally relates to a method for preparing such a road surfacing.