This document specifies the method for compaction of cylindrical specimens of bituminous mixtures using a gyratory compactor. The method is used for: ?? determination of the air voids content of a mixture for a given number of gyrations or derivation of a curve density (or void content) versus number of gyrations; ?? preparation of specimens of given height and/or at a predetermined density@ for subsequent testing of their mechanical properties. Annex A and Annex B describe method of complying for the equipment. This document applies to bituminous mixtures (both those made up in laboratory and those resulting from work site sampling)@ with an upper aggregate size not larger than 31@5 mm.