Análise da deformação permanente de misturas asfálticas com granulometria determinada pela faixa de agregados dominantes

Abstract

The permanent deformation of the coating layer in wheel tracks is one of the main defects of flexible pavements because, in addition to causing an accelerated deterioration of the structure, it reduces the user's safety. The asphalt mixture granulometry is among the main agents causing this defect, since the mineral aggregates constitute approximately 95% of its composition. Thus, in order to promote greater resistance to plastic deformations in the coating, in addition to the properties of the asphalt binder, it is necessary to know the characteristics of the aggregates and develop granulometric compositions that present a good interlocking of particles, providing more resistant mixtures. The method of The Dominant Aggregates Size Range (DASR) allows, from the parameters Porosity DASR and Disruption Factor (DF), to evaluate the granulometries in order to confirm an interaction between the aggregates, resulting in a better response of the asphalt mixture against to permanent deformation. In this work, considering the Dominant Aggregates Band Method, different granulometric bands were elaborated and asphalt mixtures were prepared, which were submitted to permanent deformation tests by a traffic simulator equipment. The results obtained revealed that The Dominant Aggregates Size Range (DASR) is an important tool to evaluate and select the granulometries of asphalt mixtures, allowing the analysis of the interlocking of particles and relating it to the resistance to permanent deformation.