comparison of alternative asphalt concrete rut characterization

BERTHELOT, CROCKFORD & LYTTON 16Table 17 summarizes the cumulative repeated shear strain at 20,000 load cycles of the Radisson SPS-9Aasphalt concrete mixes. A statistical analysis was performed at a 95 percent confidence level to evaluatethe significance of the cumulative shear strain measurements at 20,000 load cycles across the RadissonSPS-9A asphalt concrete mixes. A one-way analysis of variance concluded that Radisson SPS-9A asphaltconcrete mix type had a significant effect on the mean cumulative shear strain measurements at 20,000load cycles. Duncan's pairwise comparison determined that the mean cumulative shear strainmeasurements at 20,000 load cycles of mix 900961 was significantly different from all other mixes;however, mixes 900901, 900903, 900959, and 900960 were not significantly different; mixes 900903,900959, 900960, and 900962 were not significantly different; and mixes 900902, 900959, 900960, and900962 were not significantly different.Cumulative Shear Strain (mm/mm)0.0500.0450.0400.0350.0300.0250.0200.0150.0100.0050.0000 2000 4000 6000 8000 10000 12000 14000 16000 18000 20000Load Cycles900901 900902 900903 900959 900960 900961 900962Figure 4 Cumulative SHRP Repeated Shear Strain versus Number of Load Cycles of RadissonSpecific Pavement Studies -9A Asphalt Concrete Mixes