Field glossaryGmbBulk specific gravity of the compacted core or mat, the in-place density (AASHTO T166 / T331)Used across 2 Anvilfield field guides, most in Paving. Where this shows upPavingAsphalt density testingPavingAsphalt compaction window Related termsGmm (Rice value)% Gmm / air voidsAir voidsBreakdown rollingCessation temperatureCompaction windowNMASPWL Back to the full field glossary