Investigating the properties of rejuvenated asphalt with the modified rejuvenator prepared by waste cooking oil and waste tire crumb rubber

WROB modified rejuvenator prepared by waste tire crumb rubber (WTCR) and waste cooking oil (WCO) had tremendous potentiality in reactivating and modifying the aged asphalt. The compatibility, high and lowtemperature rheological properties, anti-rutting, aging and fatigue resistance properties were assessed by dynamic shear rheometer (DSR), bending beam rheometer (BBR) and multiple stress creep and recovery (MSCR) tests. The Fourier transform infrared spectrometer (FTIR) test results revealed that WTCR contained in WROB modified rejuvenator could regenerate the aged asphalt. The Cole-Cole curves showed that the WTCR has an active function in boosting compatibility. Moreover, the MSCR test results indicated that the WTCR had a functional effect on ameliorating the anti-rutting performance and reducing sensitivity to rutting of the rejuvenated asphalt. The indexes of anti-aging and G*.sin (delta) values respectively showed the contribution of WTCR to anti-aging performance and fatigue resistance of the rejuvenated asphalt. With 8.5% WROB modified rejuvenator, the high and low-temperature performance grade of the aged asphalt was recovered from 82-16 to 76-28. Besides, all the properties of WROB60 rejuvenated asphalt were outstanding. The properties of WROB regenerated asphalt were slightly decreased when the content of WTCR contained in the modified rejuvenator was greater than 60.