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 10no significant difference existed between the mean SHRP bulk modulus measurements at 4°C (830 kPa),20°C (690 kPa), and 40°C (550 kPa).Table 7 SHRP Bulk Modulus Measurements and Duncan's Pairwise Comparison <strong>of</strong> RadissonSpecific Pavement Studies-9A Asphalt Concrete Mixes Grouped by Test Temperature-Stress StateSPS-9A TestDuncan's Grouping*SectionMean SHRPBulk Modulus(MPa)Mean SHRPBulk ModulusCoefficient <strong>of</strong>Variation(Percent)900901 256.091 70.93 A B C900902 409.220 67.79 A B900903 374.032 53.25 A B C900959 205.111 25.80 B C900960 450.165 48.23 A900961 185.729 43.39 C900962 363.446 27.46 A B CMean 320.542 48.12* Asphalt <strong>concrete</strong> mixes with same letter are not significantly different.Table 8 SHRP Bulk Modulus Measurements and Duncan's Pairwise Comparison <strong>of</strong> TestTemperatures-Stress States Grouped by Radisson Special Pavement Studies -9A Asphalt ConcreteMixTestTemperature(HydrostaticTraction)Mean SHRPBulk Modulus(MPa)Mean SHRPBulk ModulusCoefficient <strong>of</strong>Variation(Percent)Duncan's Grouping*4°C (830 kPa) 347.698 55.07 A20°C (690 kPa) 273.068 43.66 A40°C (550 kPa) 339.899 45.63 AMean 320.542 48.12* Test temperatures-stress states with same letter are not significantly different.4.4.2 SHRP Uniaxial Strain at Constant Radius CharacterizationThe SHRP uniaxial strain at constant radius test employs the SHRP shear tester to characterize the elasticand plastic behavior <strong>of</strong> <strong>asphalt</strong> <strong>concrete</strong> under constrained uniaxial loading. SHRP uniaxial strain atconstant radius testing was performed on triplicate gyratory compacted samples at seven percent air voidsfrom each Radisson SPS-9A <strong>asphalt</strong> <strong>concrete</strong> mix at test temperatures <strong>of</strong> 4°C, 20°C, and 40°C, andcorresponding uniaxial tractions <strong>of</strong> 655 kPa, 550 kPa, and 345 kPa, respectively. Tables 9 and 10summarize the SHRP uniaxial constrained modulus measurements across the Radisson SPS-9A <strong>asphalt</strong><strong>concrete</strong> mixes and stress states-test temperatures considered in this analysis respectively.A statistical analysis was performed at a 95 percent confidence level to evaluate the significance <strong>of</strong> theSHRP uniaxial constrained compression modulus measurements across the Radisson SPS-9A <strong>asphalt</strong><strong>concrete</strong> mixes and test temperatures-stress states employed in the analysis. A two-way analysis <strong>of</strong>
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