Is the bulk specific gravity also referred to as Gmm?

The correct understanding is that bulk specific gravity is not referred to as Gmm. Instead, Gmm represents the maximum specific gravity of asphalt mixtures, which is distinctly different from bulk specific gravity.

Bulk specific gravity is the ratio of the weight of a given volume of the material to the weight of an equal volume of water, which accounts for both the material's solids and the voids in the mix. Gmm, on the other hand, measures the specific gravity of the asphalt mixture when it is fully compacted without air voids, indicating the maximum density achievable under ideal conditions.

Clarifying this distinction is crucial for proper material characterization and quality control in asphalt pavement construction. Recognizing the separate definitions of these terms is essential for anyone involved in the inspection and analysis of hot mix asphalt.