Influence of Blended Waste Cooking Oils on the Sustainable Asphalt Rejuvenation Considering Secondary Aging

Higher reclaimed asphalt (RA) usage can lead to cracking in asphalt mixtures. Waste cooking oil (WCO) is recognized as a rejuvenator for incorporating more RA in new pavements. Utilization of higher RA and WCO leads to greater environmental and economic advantages, as both materials are considered as waste. Previous research focused only on the rejuvenating effects of WCO, ignoring the variability of WCO and long-term performance of rejuvenated binder. This study examines the impact of variability of WCO on higher RA rejuvenation, specifically considering blended WCO (BW) to simulate practical conditions, as single source WCO (SSW, mono parental oil) collection is not a practical consideration. Rheological tests, Fourier transform infrared spectroscopy (FTIR), and linear amplitude sweep (LAS) were conducted on the rejuvenated binders. Results show that binders with higher sunflower oil content exhibited the greatest rejuvenation capability, followed by BW with higher palm oil and mustard oil-based WCO, respectively. Moreover, the rejuvenated binders with different BWs exhibited significantly improved fatigue life as compared to conventional binders.