Multiscale approach for characterization of asphaltic materials designed in Brazil and Spain

Abstract

This paper presents multi-scale experimental test protocols to quantify the linear viscoelastic properties of asphaltic materials. The partial results presented are part of an ongoing cooperative research effort between Brazil and Spain, and contains materials from both countries. The evaluation was based on rheological tests conducted with asphalt cements (ACs) and fine aggregate matrices (FAMs) using the dynamic mechanical analyzer (DMA), as well as the dynamic modulus test performed with the global hot mixture asphalt (HMA). The FAM used in the study was designed to represent a proper FAM proportion of the full mixture, and it was tested by applying oscillatory torque under controlled-strain conditions. In general, to reduce costs and time, several researchers have been trying to predict HMA properties using their individual constituent (binder, aggregate, fine aggregate matrices) properties. The authors of the present study intend to suggest the use of individual constituent characterization as an intermediate step aiming time, material and cost savings. Once the ACs and FAMs are properly designed and selected, HMA characterization should be conducted.