Abstract
The key to asphalt recycling lies in the appropriate selection of the recycling agent. To improve the recycling value of recycled asphalt pavement (RAP) fine materials, based on fine separated RAP fines and combined with viscosity recovering rejuvenator for recycled micro overlay mixture design, the performance of recycled asphalt binder and mixture was studied, and the influence of different rejuvenator types and RAP content was analyzed. The results show that: considering the recoverable degree of aggregate gradation and recycled asphalt performance requirements, the maximum content of fine separated RAP fines in SMA-5 recycled micro overlay is determined to be 30%; compared with ordinary recycled asphalt, the softening point, 5℃ elongation and 60℃ kinematic viscosity of recycled asphalt using viscosity recovering rejuvenator are higher, and the pull-out strength is close to that of high-viscosity asphalt; with the increase in content of fine separated RAP fines, the high temperature performance of the recycled micro overlay mixture is improved, while the low temperature crack resistance, water damage resistance and raveling resistance performance are reduced. With 30% RAP content, compared with ordinary recycled mixture, the recycled mixture using the viscosity recovering rejuvenator is 45.2% higher in low temperature crack resistance, 1.7% higher in water damage resistance, and 23.2% higher in raveling resistance; according to the engineering application, the recycled micro overlay using fine separated RAP has a good effect.
Publication Date
10-27-2025
DOI
10.14048/j.issn.1671-2579.2025.05.015
First Page
141
Last Page
149
Submission Date
November 2025
Recommended Citation
Zhaoyu, SHE; Xianghui, CHEN; Ning, LI; Zhiwei, XIE; and Wei, TANG
(2025)
"Performance and Application of Viscosity Recovering Recycled Micro Overlay Based on Fine Separated RAP Fines,"
Journal of China & Foreign Highway: Vol. 45:
Iss.
5, Article 15.
DOI: 10.14048/j.issn.1671-2579.2025.05.015
Available at:
https://zwgl1980.csust.edu.cn/journal/vol45/iss5/15
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