The rising demand for non-renewable resources such as asphalt binder is a significant issue in the pavement industry. Flexible pavement consumes a significant amount of asphalt binder, which has become a major issue in terms of environmental sustainability and from an economics viewpoint. Hence, researchers strive to find other alternatives to solve these problems, to enhance the performance and lifespan of flexible pavement. Biomass-based bio-oil, such as waste cooking oil (WCO), as a modifier has illustrated favorable effects for asphalt binder and mixture. However, in the pavement industry, its adoption as a modifier is still in an empirical stage. Hence, this paper aimed to give an overview by analyzing literature in-depth to reveal the potential of WCO as a modifier in the pavement industry. The low- and intermediate-temperature performance of the WCO-modified asphalt binder are superior. However, it compromises physical properties and high-temperature performance. Hence, it can be improved by controlling the quality of WCO or by further modification by additives such as ground tire rubber (GTR) and waste plastic. This paper also attempts to review available and potential physical and chemical technologies to minimize the negative effects of free fatty acid (FFA) and water content of WCO on modified asphalt binder properties. For WCO-modified asphalt mixture, the overall performance depends on the dose, quality of WCO, and type of additive added in the WCO-modified binder. Finally, future recommendations are provided to broaden the scope of WCO as a modifier in the forthcoming sustainable pavement industry.

Plastic is considered one of the most significant industrial inventions of this era due to its excellent properties, which lend well to many manufacturing applications. These days, there are tons of Polyethylene Terephthalate (PET) waste products that are generated around the world. This waste presents a real environmental hazard because PET is not biodegradable. This paper delineates the physical and chemical properties of PET to justify its use as an additive and aggregate replacement in the manufacture of asphalt mixtures. Furthermore, discusses details of PET-modified asphalt mixture by a dry and wet process with sufficient information to better understand the mixture. Several critical matters are investigated, such as asphalt modification to increase resistance to fatigue, rutting deformation, and moisture sensitivity. These results are important for determining the factors that significantly improve pavement mixture characteristics. The findings show that the addition of PET to asphalt mixtures yielded very promising results. PET enhanced the mechanical properties, the durability, and the long-term sustainability of the pavement. Finally, using PET waste as an additive in asphalt mixtures could serve as an environmentally friendly method to dispose of PET waste while simultaneously producing high-quality pavements.

The significant growth in road infrastructure worldwide over the last decade has resulted in a notable increase in the demand for asphalt binder. However, the utilization of asphalt binder in the road industry poses challenges to environmental sustainability and economic standpoints. The application of vehicular loads and exposure to environmental factors throughout the service life of roads contribute to the deterioration of binder properties, such as hardening and aging, ultimately leading to premature road failure. Therefore, researchers have strived to explore further alternative materials to overcome these challenges, to improve the performance of flexible pavements. Waste Engine Oil (WEO) is one such material that has shown promising effects on asphalt binder. This review aims to conduct an in-depth analysis of previous literature to explore the potential utilization of WEO as a modifier and rejuvenator for asphalt binders. WEO effectively rejuvenates aged asphalt binders, however, the required quantity for rejuvenation varies depending on asphalt characteristics. It was found that the inclusion of the WEO as asphalt modifier significantly affects the high-temperature properties of the WEO-modified asphalt binder. Conversely, WEO addition enhances lower temperature properties, improving thermal and fatigue resistance. Furthermore, the compromise properties of WEO-modified asphalt are enhanced by incorporating various additional additives such as lignin, SBS, polyphosphoric acid and crumb rubber. It was revealed that composite modification can partially substitute 8–15 % asphalt binder, which would be a way forward in cost-effective sustainable construction in the pavement industry. However, additional research is necessary to explore futuristic advancements in WEO modification technology.