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Evaluating Georgia DOT’s compaction requirements for stone matrix asphalt mixes.
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2006-06-01
[PDF-701.88 KB]
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Edition:Final; Aug. 2004-May 2006.
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Abstract:This study determined a compactive effort for Stone Mastic Asphalt (SMA) mixes with the Superpave gyratory compactor (SGC) that would match a 50-blow Marshall compactive effort using aggregates and mix designs common in Georgia. SMA mix designs were prepared with five aggregate sources using a 50-blow Marshall compaction and 50, 75, and 100 gyrations with an SGC. Optimum asphalt contents from the mix designs were compared. Aggregate breakdown from each of the compactive efforts was analyzed. Laboratory rutting tests were conducted on each mix design using the Asphalt Pavement Analyzer (APA). The results of the laboratory mix designs indicated that 35 gyrations in the SGC, on average, provided the same density as Marshall compaction. The number of gyrations required to achieve the same density as the Marshall hammer for the SMA mix designs with the five aggregates varied inversely with the L.A. abrasion. Using 50 gyrations, the optimum asphalt contents for the SMA mixtures were reduced 0.1 to 0.5 percent compared to compaction with the Marshall hammer. Aggregate breakdown was slightly less with the SGC than with the Marshall hammer. APA tests showed that the mix designs were not sensitive to asphalt content. Testing of plant-produced SMA mixtures confirmed that 34 gyrations in the SGC yielded equivalent specimen densities to the Marshall compaction. Based on the results from the laboratory and field mixes, 50 gyrations with the SGC is recommended to replace 50-blow Marshall compaction for SMA mix designs in Georgia.
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