United States Department of Transportation
i
Bulk specific gravity round-robin using the Corelok vacuum sealing device
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2002-11-01
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[PDF-763.00 KB]
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Abstract:This project conducted an evaluation of the Corelok device for the determination of the bulk specific gravity of compacted hot mix asphalt samples. The project consisted of the bulk specific gravity determination for compacted HMA mixes utilizing the Corelok vacuum-sealing device and the SSD method (AASHTO T166). All samples were prepared (including compaction of samples) by the National Center for Asphalt Technology (NCAT) and were provided to each participating laboratory for testing. Participating laboratories conducted the bulk specific gravity testing utilizing both the Corelok device and SSD method. Test results were then returned to NCAT for statistical analysis and determination of repeatability and reproducibility parameters for both methods. A total of 21 laboratories participated in this study, 18 of which returned test results. Each laboratory was provided a Corelok vacuum-sealing device through the pooled-fund effort. The repeatability and reproducibility of the Corelok method were shown to be similar to AASHTO T166. The analyses also compared the measured bulk specific gravities from each method. The results for fine graded Superpave mixes were similar up to a water absorption of 2 percent. This matches the current recommendations of AASHTO T166. However, for coarse graded Superpave mixes and Stone Matrix Asphalt, the measured bulk specific gravities diverged above a water absorption of 0.4 percent. For coarse graded mixes, this level of water absorption encompasses sample air voids typically found during mix design (4 percent). Therefore, the Corelok method was recommended for bulk specific gravity determination during both mix design and construction for coarse graded Superpave and Stone Matrix Asphalt. Further research was recommended to better define when the Corelok method should be used. References, 7 append., 13 tables, 28 fig.; 122 p.
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