Abstract
The performance of diverse types of bio-oils varies greatly from each other, which makes it arduous to apply different bio-oils directly in engineering practice. This study is based on physical and microscopic properties, studying different types of bio-oil recycled asphalt and analyzing their differences. Five bio-oils (castor oil, straw oil, soybean oil, gutter oil, and vegetable oil) were used to regenerate asphalts after short-term and long-term aging to prepare recycled asphalts. The physical performances of recycled asphalts with different bio-oils were assessed, including penetration, softening point, and ductility tests. In addition, scanning electron microscopy was utilized to investigate the microscopic morphologies of recycled asphalts. Simultaneous thermogravimetry and differential scanning calorimetry were applied to determine the thermal stabilities of recycled asphalts. Finally, Gel permeation chromatography was employed to analyze the asphalt's relative molecular masses. The results revealed that vegetable and gutter oil have apparent adverse effects on temperature sensitivity and high-temperature performance of aged asphalt. In contrast, they have positive effects on low-temperature performance. All five bio-oils can repair cracks on the surface of aged asphalt. However, the surface wrinkles of vegetable oil-recycled asphalt and castor oil-recycled asphalt are relatively less and have an outstanding recycling effect. The slight thermal weight loss of recycled asphalts corresponding to castor oil, straw oil, and soybean oil at high temperatures positively impacted the high-temperature stability of aged asphalt. The castor oil and soybean oil recycled asphalts have significantly larger relative molecular masses and have advantages in high-temperature performance. This paper reveals the impact of different bio-oils on asphalt regeneration, which contributes a theoretical basis for promoting the practical implementation of bio-oil in road projects, with obvious economic and social benefits.
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