A Review of Aggregate and Asphalt Mixture Specific Gravity ...
A Review of Aggregate and Asphalt Mixture Specific Gravity ...
A Review of Aggregate and Asphalt Mixture Specific Gravity ...
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criteria so that the resulting mixtures can be expected to perform as well orbetter than those in current use. Reasoning was provided in this report tosupport an increase in VMA by 0.5% for coarse-graded Superpave <strong>and</strong> SMAmixtures.• Using the vacuum-sealing method in lieu <strong>of</strong> T 166 for measurement <strong>of</strong> coredensities will shift the results more dramatically than for mix designs.Available data shows that in-place air voids are approximately 1.0 <strong>and</strong> 1.7%higher on average for coarse-graded mixtures <strong>and</strong> SMA mixtures,respectively, when using the vacuum-sealing method in place <strong>of</strong> T 166.Therefore, changing to the vacuum-sealing method for acceptance testing <strong>of</strong>in-place density will result one <strong>of</strong> two scenarios for agencies: either leave inplacedensity criteria as is <strong>and</strong> expect contractors to improve their compactionprocesses to meet the criteria, or adjust the specification criteria for in-placedensities to be consistent with the new measurement method so that densitieslevels are achievable with the current practices for asphalt pavementconstruction.32
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