Abstract
This study was conducted to investigate the cause of variation in Hot Mix Asphalt (HMA) bulk specific gravity test results. Several methods were evaluated including AASHTO T166, Standard Method of Test for Bulk Specific Gravity of Compacted Asphalt Mixtures Using Saturated Surface-Dry Specimens (Method A), and ASTM D6752, Standard Method of Test for Bulk Specific Gravity and Density of Compacted Mixtures Using Automatic Vacuum Sealing Method. A better understanding of the methods currently in use and the factors that influence the variability of bulk specific gravity values may help standards developers to identify those methods and factors that have the greatest potential for reducing the variation of relative density test results.
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