A Review on the Role of Rejuvenators in Modifying the Chemical Properties and Rheological Behavior of Aged Bitumen of Recycled Asphalt Pavements

Document Type : Original Article

Authors
Ali Babazadeh Nadinloei 1
Hasan Taherkhani 2
1 Ph.D. Student, Civil Engineering Department, University of Zanjan, Zanjan, Iran.
2 Associate Professor, Civil Engineering Department, University of Zanjan, Zanjan, Iran.
10.22034/road.2023.364153.2096
Abstract
Nowadays, to solve environmental problems and crises, the concepts of circular economy and sustainability have been paid more attention and extensive efforts are being made to recycle or reuse non-renewable resources. In the field of road pavement engineering, encouraging the use of recycled asphalt pavements is one of the easiest ways to promote a circular economy. One of the main issues regarding the use of this recycled material is the aged bitumen which it’s aging and rejuvenation process affect significantly on the durability and service life of asphalt pavements. Therefore, achieving complete knowledge of these aspects from a chemical and rheological point of view is essential. In this research, while studying the aging process, by introducing different methods of aged bitumen reclaiming, the types of biological and oil-derived rejuvenators studied in different researches have been introduced and their performance has been reviewed. Also, different chemical analyses were introduced and described as tools to investigate bitumen aging and rejuvenation processes. Finally, in order to rejuvenate the aged bitumen of recycled asphalt pavements and choose the type, dose and method of adding rejuvenators, it is recommended that the optimal dose of rejuvenator is determined based on long-term field performance data and in full-scale applications. It is also recommended to investigate the effect of rejuvenating chemical components on the characteristics of rejuvenated bitumen, perform field performance studies of rejuvenated asphalt pavements, and the possibility of combining the rejuvenating effect of recycled agent with other modifiers to improve asphalt performance in specific climatic conditions.
Keywords
Recycled Asphalt Pavements
Aging
Rejuvenator
Chemical Properties
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