Investigating the effects of waste oil and styrene-butadiene rubber on restoring and improving the viscoelastic, compatibility, and aging properties of aged asphalt

The objective of this study is to estimate the effects of using waste cooking oil (WCO), waste engine oil (WEO) as well as styrene butadiene rubber (SBR) on the performance restoration and improvement for aged asphalt. The rheological properties of aged and rejuvenated asphalts were assessed using rotational viscometer (RV), dynamic shear rheometer (DSR) and bending beam rheometer (BBR) methods. Moreover, compatibility, aging properties and rejuvenation mechanism of rejuvenated asphalts were also explored. The results revealed that WCO and WEO both strengthened the viscous properties, fatigue and cracking resistance, but adversely affects the temperature sensitivity, rutting resistance, elastic recovery, compatibility and aging properties of rejuvenated asphalt. Meanwhile, adding SBR further improved the temperature sensitivity, high and low temperature performance, compatibility as well as aging resistance of rejuvenated asphalt. Besides, WCO rejuvenated asphalt had some advantages in fatigue cracking resistance performance, while WEO rejuvenated asphalt possessed better rutting resistance, creep recovery and compatibility. Furthermore, Fourier transform infrared (FTIR) spectroscopy test showed that the physical blending mainly determined the rejuvenation mechanism when both waste oil and SBR was used in aged asphalt. Considering overall performance of rejuvenated asphalt, the optimum dosage of waste oil and SBR were recommended as 10 wt% and 3 wt%, respectively. (C) 2020 Elsevier Ltd. All rights reserved.

Automated summary

This study investigated the effects of using waste cooking oil, waste engine oil, and styrene butadiene rubber on the performance restoration and improvement of aged asphalt. The results showed that waste oil improved certain properties but had negative impacts, while the addition of SBR further enhanced performance. The recommended optimal dosages were determined for overall performance enhancement.