Waste chicken fat oil as a biomass regenerator to restore the performance of aged asphalt: rheological properties and regeneration mechanism

This study used waste chicken fat oil (CFO) to regenerate aged asphalt binder. The molecular composition of the CFO was assayed by gas chromatography-mass spectrometry. The performance grade of the CFO-rejuvenated recycled asphalt was compared with that of the original asphalt, while the high-temperature rutting performance of CFO-rejuvenated asphalt was assessed by the multiple stress creep recovery test, and the fatigue cracking ability of the rejuvenated asphalt was determined by a linear amplitude sweep test. It is obvious that CFO can soften aged asphalt. The performance grade of low-temperature 6% CFO-rejuvenated asphalt is superior to that of the original asphalt. The sulfoxide index can be utilised to evaluate the aging recovery degree of CFO-rejuvenated asphalt. The addition of CFO can improve the fatigue properties of aged binder and delay the fatigue damage of asphalt. It is suggested that 6% CFO should be used in recycling aged asphalt binder.

Automated summary

This study used waste chicken fat oil (CFO) to regenerate aged asphalt binder and found that it can soften aged asphalt, improve performance grade, and enhance fatigue properties of the asphalt.