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This paper presents the research results of a laboratory study that evaluated the influence of mixture types and aggregate types to the rut-susceptibility of asphalt mixtures. Three types of mixtures were considered. These three mixtures were: 1) stone mastic asphalt (SMA), 2) coarse matrix high binder (CMHB) and, 3) dense-graded wearing course mixture. For the SMA mixtures, three types of aggregates, siliceous limestone, sandstone and novaculite were evaluated. For the other two mix types, crushed limestone was used. An SB polymer modified asphalt cement meeting Louisiana specification for PG 70-22M was used for all the mixtures. A total of five mixtures were evaluated in the laboratory through a series of fundamental engineering property tests.
A comprehensive comparison suggested that SMA mixture with sandstone exhibited best performance in rut-resistance among all five mixes. For mixtures containing limestone aggregate, dense-graded mixture and the coarse matrix high binder had higher rut-resistant indices than the SMA mixtures. For the SMA mixtures with different aggregate types, mixture with sandstone exhibited the best rut-resistant indices while the one with novaculite showed better indices than the one with limestone.
asphalt mixture, SMA, CMHB, rutting, mixture characterization
Associate Professor, Louisiana Transportation Research Center, Louisiana State University, Baton Rogue, LA
Research Associate, Louisiana Transportation Research Center, Baton Rouge, LA
Pavement Engineer, Texas Department of Transportation,