Influence of aggregate type on binder aging in HMA mixtures Conference Paper uri icon

abstract

  • This study evaluated the effects of three different aggregate sources, different binder contents, and two different binders on the oxidative aging of the asphalt binders in their respective mixtures. These characteristics were investigated by first quantifying the mixture stiffness by the dynamic modulus (E*) as a function of age. The binder from the mixtures were then extracted and recovered in order to measure the binder kinetics, which were represented by carbonyl area (CA) measured from the Fourier Transform Infrared Spectroscopy (FT-IR) spectra as a function of aging time for each binder. The low shear viscosity (LSV) was also determined as a function of aging indicated by the CA measurements, yielding the hardening susceptibility (HS) relationships which were the oxidation characteristics used to compare binder aging. This study generally found measurable differences in the HS relationships between the different mixtures with effective binder content (Pbe) showing the strongest influence on the HS.

published proceedings

  • Proceedings of the 44th Symposium on Engineering Geology and Geotechnical Engineering

author list (cited authors)

  • Morian, N., Hajj, E. Y., Glover, C. J., & Sebaaly, P. E.

complete list of authors

  • Morian, N||Hajj, EY||Glover, CJ||Sebaaly, PE

publication date

  • December 2012