Characterization of waste cooking oil and waste engine oil on physical properties of aged bitumen

Waste cooking oil (WCO) and waste engine oil (WEO) have been generated in huge quantities in recent years as a result of the improvement of society's living standards and the advancement of automobiles and The molecular structure of WCO and WEO is similar to bitumen, indicating their potential for usage in highway construction to mitigate the hardening effect of recovered asphalt pavement materials. In this study, five different ratios of WCO and WEO were blended with VG40 grade bitumen under ageing conditions in accordance with the adaptability of the paving bitumen specification (IS 73: 2013). The waste oil treated samples were artificially short-aged by means of the thin film oven test. The penetration, softening point, viscosity, temperature sensitivity, penetration ageing ratio, and ductility tests were used to evaluate the physical performance parameters of the WCO and WEO modified bitumen. The results of the tests reveal that the blending of WCO and WEO with neat bitumen softens the workability of aged bitumen. The physical properties of aged bitumen improved when treated with WEO as compared to when treated with WCO. Based on the results of the analyses and the overall ranking, it has been found that a blend of 3 percent WEO and 3 percent WCO resulted in the most significant improvement in bitumen modification. Significant differences were observed when waste oil was blended with a higher percentage, resulting in a change in the grade of bitumen. Copyright (c) 2022 Elsevier Ltd. All rights reserved. Selection and peer-review under responsibility of the scientific committee of the "Material TECH 2022 (Second International Conference on Materials and Technologies)". This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).