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Impact of Intrinsic Properties of Aggregate and Volumetric Properties of Hot Mixture Asphalt (HMA) in the Influence of the Resistance to Rutting

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Document pages: 8 pages

Abstract: Several studies show that properties ofHot Mixture Asphalt (HMA) mix design materials, aggregate gradation andvolumetric properties had an influence on their resistance to rutting. However,these properties do not impact in the same way this performance. For a givenaggregate type, an infinity aggregate gradation type can beobserved, and for each type of HMA several types of bituminous binder can beused. This article aims to measure the evolution of resistance to ruttingaccording to the three main classes of National Cooperative Highway ResearchProgram (NCHRP) aggregate gradation (dense-graded, fine-graded andcoarse-graded). To this end, a study was conducted on themeasurement of rutting resistance for eight bituminous mixtures manufactured withtwo bitumen types and twotypes of manufacturing aggregates. The results showed that there is a priorityorder of these different parameters on the influence of the resistance torutting. This highlights a competition between the properties of aggregate andtype of granular skeleton. Indeed, for the same type of aggregate, asphaltbinder type first impacts resistance to rutting of the HMA followed by aggregate gradation, volumetricproperties of the mix and finally by the angularity of the aggregates. However, this order cannot be fixedand can depend of the intensity of each parameter.

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