Rejuvenators
are used to restore the properties of reclaimed asphalt
pavement (RAP) binders through readjusting the balance between the
asphaltene and maltene fractions. To properly understand the effect
of rejuvenators, it is important to analyze the chemical changes in
the rejuvenated binders and to relate these changes to the rheological
properties of the binders. In this study, RAP binders were blended
with a bio-based and an aromatic extract petroleum-based rejuvenator
additive. Chemical and thermal techniques, such as differential scanning
calorimetry (DSC), attenuated total reflection Fourier transform infrared
(FTIR) spectroscopy, and saturate, aromatic, resin, and asphaltene
determinator (SAR-AD) were used to analyze the control and rejuvenated
RAP binders. Glass transition temperatures were obtained using DSC
and correlated with rheological measurements using a dynamic shear
rheometer (DSR) and a 4 mm plate geometry. From FTIR results, the
evolution of the carbonyl and sulfoxide indices with aging were determined
and correlated with the complex shear modulus DSR measurements at
different aging stages. The SAR-AD analysis was used to determine
the changes in the asphalt fractions with the addition of the rejuvenators.
Temperature–frequency DSR sweeps and bending beam rheometer
testing were conducted, and master curves were constructed for the
different binders. From these master curves, the effect of the different
rejuvenators on the crossover temperature, glass-transition temperature,
and intermediate region temperature range (T
IR) was determined.
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