Document Type : Regular Paper
Authors
1
Assistant Professor, Department of Civil Engineering, Faculty of Technology and Engineering, University of Guilan, Rasht, Iran
2
Professor, Department of Civil Engineering, Faculty of Engineering, University of Guilan, Rasht, Iran
3
M.Sc. Student, Department of Civil Engineering, Faculty of Engineering, University of Guilan, Rasht, Iran
4
M.Sc., Department of Civil Engineering, Faculty of Engineering, University of Guilan, Rasht, Iran
10.22075/jrce.2024.32651.1951
Abstract
The phenomenon of asphalt binder aging can lead to various failures, such as rutting in the asphalt mixture. Rejuvenator materials are used to mitigate asphalt binder aging. Bio-asphalt, as a binder modified with bio-waste materials, offers environmental benefits and enhances asphalt binder aging. Recent research has indicated that bio-oils improve the effectiveness of asphalt binders at moderate and low temperatures, but they may exacerbate the susceptibility to rutting at high temperatures. This study employed rice bran oil (RBO) as an environmentally friendly rejuvenating agent in asphalt binder and leveraged the benefits of nano-CaO to enhance asphalt binder performance at high temperatures. Based on the findings of this study, The binder sample with 5% RBO and 3% nano-CaO exhibited superior performance in the multiple stress creep recovery (MSCR) test, and rutting susceptibility decreased by 15-20% compared to the unmodified samples. Conversely, utilizing 5% RBO without nano-CaO increased rutting susceptibility by 25-30%.
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