Abstract: A tireless rotatable asphalt mixer. The mixer is provided with a rotatable tubular cylindrical section that is suspended along an axis of rotation at bearing mounts. The apparatus is allowed to expand by way of fixing one bearing mount and allowing the other mount to float with respect to longitudinal elongation resulting from thermal expansion. In the mixer, heated aggregate, liquid asphalt cement, and aggregate dust are mixed to produce an asphalt composition. The asphalt cement injection point is adjustable longitudinally along the centerline of the mixer, by way of replacement of an asphalt cement injection tube with a substitute injection tube of a different length. Further, multiple asphalt cements of different compositions may be introduced into the mixer by means of additional injection pipes at the inlet end of the mixer. Recycled Asphalt Pavement (“RAP”) may be added to the mixer with heated aggregate through the inlet chute.