Validação da metodologiade faixa de agregados dominantes para avaliação e especificação da granulometria de misturas asfálticas densas

Abstract

Traditionally, the selection of aggregate gradation in asphalt mixtures follows an empirical procedure in which aggregate proportioning of former projects is considered, or trial and error methods are used. In this paper three asphalt mixtures (one of which are field mixes) were investigated to validate a methodology of gradation selection considering its effect on permanent deformation. The main concept is the existence of a coarse aggregate band that is responsible within the mix for its resistance to rutting. The evaluation criterion is the porosity of the dominant aggregates in the mixture, which was correlated to the Flow Number (FN) result for each investigated mixture. The mixture porosities presented good correlation with their respective FNs and reflected their field behavior. When compared to the Bailey method, this methodology showed to be simpler and presented more comprehensive analysis.