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 44.0 RADISSON SPS-9A ASPHALT CONCRETE CHARACTERIZATION RESULTS4.1 Marshall Stability and Flow CharacterizationMarshall stability and flow testing <strong>of</strong> <strong>asphalt</strong> <strong>concrete</strong> has been widely used by the road industry and isstandardized in ASTM D 1560 and AASHTO T245. Marshall stability and flow measurements weretaken on triplicate gyratory compacted samples at seven percent air voids from each Radisson SPS-9A<strong>asphalt</strong> <strong>concrete</strong> mix. Table 2 summarizes the Marshall stability measurements and Table 3 summarizesthe Marshall flow measurements <strong>of</strong> the Radisson SPS-9A <strong>asphalt</strong> <strong>concrete</strong> mixes.Table 2 Marshall Stability Measurements and Duncan's Pairwise Comparison <strong>of</strong> RadissonSpecific Pavement Studies-9A Asphalt Concrete MixesSPS-9A TestDuncan's Grouping*SectionMean MarshallStability(N)MarshallStabilityCoefficient <strong>of</strong>Variation(Percent)900901 3958 10.84 C900902 7562 6.55 A900903 5115 15.72 B C900959 7176 13.02 A900960 5975 8.63 B900961 4685 14.22 C900962 7828 9.30 AMean 6042 11.18* Asphalt <strong>concrete</strong> mixes with same letter are not significantly different.Table 3 Marshall Flow Measurements and Duncan's Pairwise Comparison <strong>of</strong> Radisson SpecificPavement Studies9A Asphalt Concrete MixesSPS-9A TestDuncan's Grouping*SectionMean MarshallFlow(0.25 mmIncrements)Marshall FlowCoefficient <strong>of</strong>Variation(Percent)900901 12.0 8.33 C900902 14.3 4.03 B C900903 14.3 4.03 B C900959 16.3 18.70 A B900960 14.3 4.03 B C900961 12.0 8.33 C900962 18.7 17.22 AMean 14.6 9.23* Asphalt <strong>concrete</strong> mixes with same letter are not significantly different.A statistical analysis was performed at a 95 percent confidence level to evaluate the significance <strong>of</strong> theMarshall stability and flow measurements <strong>of</strong> the Radisson SPS-9A <strong>asphalt</strong> <strong>concrete</strong> mixes. A one-wayanalysis <strong>of</strong> variance concluded that Radisson SPS-9A <strong>asphalt</strong> <strong>concrete</strong> mix type had a significant effecton the mean Marshall stability measurements. Duncan's pairwise <strong>comparison</strong> (25) determined that themean Marshall stability measurements <strong>of</strong> mixes 900902, 900959, and 900962 were not significantly
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