Engineering and Chemical Properties of Rejuvenated Asphalt Binders

抄録

Rejuvenator has gradually becoming to be a commonly-used soft agent to be used in recycling of reclaimed asphalt pavements (RAP) for the past two decades. Aged bitumen recovered from two different RAPs was mixed with various percentages of recycling agents to produce rejuvenated asphalt binders. The engineering and chemical properties of the blends were evaluated in the laboratory by binder tests including viscosity, dynamic shear rheometer, gel permeation chromatograph, and Fourier transform infrared spectroscopy. Test results indicated that: (1) hardened binders could be restored to proper performance characteristics using rejuvenators; (2) the recycling process could produce a final blend that was similar to a reference binder in terms of the viscoelastic properties; (3) the amount of large molecular size was shown to be a characteristic of an asphalt blend, and (4) the formation of carbonyl area in aged asphalt was reduced by the addition of recycling agents.