Short-Term Laboratory Conditioning of Asphalt Mixtures (2015) / Chapter Skim
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50 Asphalt mixtures have been traditionally designed on the basis of volumetric parameters in which the optimum asphalt content for a given aggregate gradation was dependent upon the compaction effort, AV content, voids in mineral aggregate, and asphalt absorption into aggregate voids. These volumetric procedures worked well for agencies and contractors in an era when the components for asphalt mixtures were relatively constant.
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51 5,000 load cycles) also provided evidence that the laboratory STOA protocols produce representative specimens for performance testing.
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52 • Based on the mixture stiffness results, the laboratory STOA protocol of 2 hours at 275°F (135°C) on loose mixture plus LTOA protocols of 2 weeks at 140°F (60°C)
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53 • Differences in volumetric properties were observed for mixtures using highly absorptive aggregates when comparing LMLC specimens with the laboratory STOA protocols of 2 hours at 275°F (135°C) for HMA and 2 hours at 240°F (116°C)
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