Métodos de seleção granulométrica com foco na resistência à deformação permanente

Abstract

Aggregate gradation of an asphalt mixture has an important role in its resistance to permanent deformation. In this paper, the Bailey method and the Dominant Aggregate Size Range (DASR) model are evaluated and compared. Both methodologies intend to select aggregate gradation with proper interlocking to resist permanent deformation. Eight asphalt mixtures produced with materials from different regions in Brazil were used. The results show that the DASR model can be used in mixture design to estimate field performance of asphalt mixtures with respect to permanent deformation based on a single parameter, the DASR porosity. On the other hand, among the parameters of the Bailey method (AG, GAM and FAM), only the AG values reflect the mechanical behavior of asphalt mixtures. The laboratoryand field results indicate that the DASR model has potential for practical application.