This test method covers the determination of bulk specific gravity (G mb ) of compacted bituminous mixtures. This method can be used with samples that contain open or interconnecting voids or absorb more than 2.0 percent water by volume, or both. Note 1 - Water absorption by volume is determined using T 166; this specification does not contain a direct determination of the water absorption by volume. The bulk specific gravity of the compacted bituminous mixtures may be used in calculating the unit mass of the mixture.