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The Influence of Waste Cooking Oil on Recycled Asphalt Mixture Properties | ||
| Kerbala Journal for Engineering Sciences (KJES) | ||
| Article 2, Volume 6, Issue 2, June 2026, Pages 120-138 PDF (2.89 M) | ||
| Document Type: Research Article | ||
| DOI: 10.63463/kjes1210 | ||
| Authors | ||
| Zainab R Alobaidy* 1; Anmar Dulaimi2; Anmar Dulaimi3; Raid R.Almuhanna4 | ||
| 1Civil Engineering Department, College of Engineering, University of Kerbala, Iraq. | ||
| 2Civil Engineering Department. College of Engineering, University of Karbala, Iraq. | ||
| 3School of Civil Engineering and Built Environment, Liverpool John Moores University, Liverpool L3 2ET, UK, | ||
| 4Department of Civil Engineering, University of Kerbala, Karbala, Iraq | ||
| Abstract | ||
| This study investigated the use of waste cooking oil (WCO) as a potential rejuvenator to find the best dosage and assess its effects on recycled asphalt pavement (RAP), which is essential for more sustainable and environmentally friendly road construction. When added to new asphalt mixtures, RAP reduces the requirement for virgin raw materials, minimizes waste from the removal of old pavements, and lowers the energy required for extraction and refinement. Despite these advantages, the high stiffness of RAP mixtures often restricts their use to less than 30%. This restriction can be mitigated by the use of rejuvenating chemicals. However, due to the greater stiffness of the RAP binder, high-RAP mixes are more likely to break at low temperatures and have poor mixture workability. One of the additives used to address these shortcomings is recycling agents. Mixtures of 25%, 50%, and 75% RAP with 2%, 4%, 6%, and 8% WCO concentrations were critically examined to establish a reliable evaluation of performance. The results demonstrated that RAP is suitable for use in hot mix asphalt, with the optimal WCO range being between 2% and 8%. Overall, the findings demonstrate that combining high RAP proportions with WCO is a viable and sustainable approach to modern road construction. | ||
| Keywords | ||
| Hot mix asphalt; reclaimed asphalt pavement; rejuvenator; waste cooking oil | ||
| References | ||
|
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