Rheological properties of bio-rejuvenated asphalt and rejuvenator dosage optimization

Authors

• Liu Jiayao, School of Civil Engineering , Shaanxi Polytechnic University , Xianyang , Shaanxi 712000 , ChinaFollow
• Zhang Yan, School of Civil Engineering , Shaanxi Polytechnic University , Xianyang , Shaanxi 712000 , China
• Chen Shuo, School of Civil Engineering , Shaanxi Polytechnic University , Xianyang , Shaanxi 712000 , China
• LI Jiange, School of Architecture and Civil Engineering , Xi’an University of Science and Technology , Xi’an, Shaanxi 710054 , China
• Si Wei, Highway School , Chang’an University , Xi’an, Shaanxi 710064 , China
• Hu Yongping, School of Civil and Environmental Engineering , UNSW Sydney , Sydney 2052 , AustraliaFollow

Corresponding Author

胡永平，男，博士（后）.E-mail：[email protected]

Abstract

To restore the pavement performance of aged asphalt, this study used a bio-based rejuvenator to treat laboratory-aged asphalt. The chemical composition of the rejuvenator was analysed using gas chromatography-mass spectrometry (GC-MS ) to investigate the rejuvenation mechanism. The high-temperature rheological performance, intermediate-temperature fatigue resistance, and low-temperature cracking resistance of virgin asphalt, aged asphalt, and rejuvenated asphalt were characterised using multiple stress creep recovery tests, linear amplitude sweep tests, and bending beam rheometer tests, respectively. The results show that the bio-based rejuvenator contains a large quantity of fatty acids, which can effectively restore the creep properties of asphalt, reduce its low-temperature brittleness, enhance flexibility, and improve durability. Fatty alcohols in the rejuvenator facilitate its uniform dispersion and rapid penetration into the asphalt, thus ensuring effective rejuvenation. Rheological tests demonstrate that the use of the bio-based rejuvenator effectively restores the low-temperature cracking resistance and improves the intermediate-temperature fatigue resistance of the asphalt. The upper limit of the rejuvenator dosage is determined to be 5%‒6% based on high-temperature performance thresholds, while the lower limit is determined to be 4% ‒5% based on low-temperature performance requirements. Fatigue properties do not impose a significant constraint on rejuvenator dosage. Taking into account high- and low-temperature rheological performance and fatigue resistance, the optimal dosage of the bio-based rejuvenator is determined to be 5%.

Publication Date

10-29-2026

DOI

10.14048/j.issn.1671-2579.2026.05.009

First Page

84

Last Page

92

Submission Date

October 2026

Recommended Citation

Jiayao, Liu; Yan, Zhang; Shuo, Chen; Jiange, LI; Wei, Si; and Yongping, Hu (2026) "Rheological properties of bio-rejuvenated asphalt and rejuvenator dosage optimization," Journal of China & Foreign Highway: Vol. 46: Iss. 5, Article 9.
DOI: 10.14048/j.issn.1671-2579.2026.05.009
Available at: https://zwgl1980.csust.edu.cn/journal/vol46/iss5/9

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