The behaviour of rejuvenated SBS-modified asphalt incorporating catalytic-reactive compounded rejuvenator

ABSTRACT

A novel catalytic-reactive compounded rejuvenator containing aromatic oil (AO), epoxidised soybean oil (ESO) and triphenyl phosphine (TPP, catalyst) was developed to rejuvenate aged SBS-modified asphalt (SBSMA).Three types of rejuvenator (AO, AO/ESO, AO/ESO(TPP)) were employed to rejuvenate long-term aged SBSMA. The results show that 10 wt% AO can obviously improve the physical properties of SBSMA. Besides, when the proportion of AO to ESO(TPP) is 50%:50%, the ductility of SBSMA can be enhanced significantly while its high-temperature performance is guaranteed. The binder rejuvenated by AO/ESO(TPP) has better high- and low-temperature performances than that rejuvenated by AO/ESO. In Fourier transform infrared spectroscopy test, a new 1116 cm⁻¹ peak appears in the spectra of rejuvenated binder (50%AO/50%ESO(TPP)), indicating that TPP can open the epoxy groups and the opened epoxy groups are able to polymerise with aged SBS molecules. In Gel permeation chromatography test, the increase of SBS peak indicates that the degraded SBS was repaired.

KEYWORDS:

• Styrene–butadiene-styrene copolymer
• SBS-modified asphalt
• Catalytic-reactive compounded rejuvenator
• Rheological properties
• Fourier transform infrared spectroscopy
• Ageing

Acknowledgements

This work was supported by the National Natural Science Foundation of China [grant numbers 52078209, 51678232], the Huxiang Youth Talent Program of Hunan Province [grant number 2019RS2052], the Transportation Science and Technology Development and Innovation Project of Hunan Province [grant number 201805], the Science and Technology Planning Project of Hunan Province [grant numbers 2019XF5036, 2019GK5004]. The authors gratefully acknowledge their financial support.

Additional information

Funding

This work was supported by the National Natural Science Foundation of China [grant numbers 52078209, 51678232], the Huxiang Youth Talent Program of Hunan Province [grant number 2019RS2052], the Transportation Science and Technology Development and Innovation Project of Hunan Province [grant number 201805], the Science and Technology Planning Project of Hunan Province [grant numbers 2019XF5036, 2019GK5004].