comparison of alternative asphalt concrete rut characterization
comparison of alternative asphalt concrete rut characterization
comparison of alternative asphalt concrete rut characterization
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BERTHELOT, CROCKFORD & LYTTON 9Figure 3 SHRP Shear Tester Simple Shear, Frequency Sweep Shear, and Repeated Shear SampleConfiguration4.4.1 SHRP Volumetric-Hydrostatic CharacterizationThe SHRP volumetric-hydrostatic test evaluates the bulk elastic properties <strong>of</strong> <strong>asphalt</strong> <strong>concrete</strong> underdifferent states <strong>of</strong> hydrostatic stress and temperature. SHRP volumetric-hydrostatic testing wasperformed on triplicate gyratory compacted samples at seven percent air voids from each Radisson SPS-9A <strong>asphalt</strong> <strong>concrete</strong> mix at test temperatures <strong>of</strong> 4°C, 20°C, and 40°C, and corresponding peak hydrostatictractions <strong>of</strong> 830 kPa, 690 kPa, and 550 kPa, respectively. Tables 7 and 8 summarize the SHRP bulkmodulus measurements across the Radisson SPS-9A <strong>asphalt</strong> <strong>concrete</strong> mixes and stress states-testtemperatures considered in this analysis respectively.A statistical analysis was performed at a 95 percent confidence level to evaluate the significance <strong>of</strong> theSHRP bulk modulus measurements across the Radisson SPS-9A <strong>asphalt</strong> <strong>concrete</strong> mixes and stress statestesttemperatures employed in the analysis. A two-way analysis <strong>of</strong> variance concluded that RadissonSPS-9A <strong>asphalt</strong> <strong>concrete</strong> mix type had a significant effect on the mean SHRP bulk moduli measurements.However, test temperature-stress state, and the interaction effects between Radisson SPS-9A <strong>asphalt</strong><strong>concrete</strong> mix type and test temperature-stress state did not have a significant effect on the mean SHRPbulk measurements. Duncan's pair wise <strong>comparison</strong> <strong>of</strong> the mean SHRP bulk modulus <strong>of</strong> the RadissonSPS-9A <strong>asphalt</strong> <strong>concrete</strong> mixes grouped by test temperature-stress state determined that: mixes 900901,900902, 900903, 900960, and 900962 were not significantly different; mixes 900901, 900902, 900903,900959, and 900962 were not significantly different; and mixes 900901, 900903, 900959, 900961, and900962 were not significantly different. Duncan's pairwise <strong>comparison</strong> <strong>of</strong> the mean SHRP bulk modulusacross test temperatures-stress states grouped by Radisson SPS-9A <strong>asphalt</strong> <strong>concrete</strong> mix determined that
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