Experimental evaluation shows waste cooking oil improves rheological properties in aged binders, indicating effective rejuvenation.
Recycled asphalt pavement (RAP) has been considered as an alternate material in construction of pavement which decrease construction cost and enhance reutilizing of materials. Main challenge is incorporating the virgin material properties back to aged binder material. The present study deals with the evaluation of waste cooking oil as rejuvenator for long term aged Viscosity Grade VG-40 binder to achieve back the properties of virgin VG-40 binder. Long term age simulation was carried in the laboratory by Rolling Thin Film Oven (RTFO) and Pressure ageing vessel (PAV). The study mainly comprises of basic rheological characterisation of virgin VG-40 binder and Waste Cooking Oil (WCO) rejuvenated Long Term Aged (LTA) VG-40 binder using Brookfield rotational viscometer at different temperature increments from 60 ˚C to 160 ˚C. The results from the study indicated that the incorporation of 11% waste cooking oil into LTA VG-40 has shown improvement in its physical properties and selected as optimum dosage of rejuvenator. The mixing and compaction temperatures are about 4.5 °C less for WCO rejuvenated LTA VG-40 binder relative to virgin VG-40 binder. Results from graphs depict that virgin and rejuvenated binders are showing shear thinning behaviour at almost all temperature conditions.
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Tabitha et al. (2025) studied this question.
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