Soy-based rejuvenated asphalt binders: Impact on rheological properties and chemical aging indices

摘要

The main purpose of this study is to evaluate the performance of four recycling agents - one conventional petroleum-based (PB) oil and three soy-based (SB) bio-oils - in terms of rutting, fatigue and thermal cracking behavior and chemical properties of the rejuvenated asphalt binders. The PG grade was used to assess the high and low critical temperatures, and the MSCR and LAS tests were used to evaluate the rutting and fatigue characteristics, respectively. Changes in the chemical aging groups were tracked by means of FTIR spectroscopy. The bio-oils have great potential to be employed as recycling agents as they restored the high and low critical temperatures of the aged binders. The bio-rejuvenated binders presented an excessive mass loss compared to the standard rejuvenated one despite their enhancement in the fatigue life. The carbonyl indices were reduced, showing that the rejuvenators were capable of mitigating the effect of binder aging.