Performance assessment of aged binder rejuvenated with Polanga oil

Presently, there is a necessity of increasing the reclaimed asphalt pavement (RAP) content in recycling of asphalt pavements to save material cost, preserve energy and protect the environment and efforts are being made to utilize 100% RAP in the mixes. RAP binder is usually stiff due to oxidation and loss of volatiles. So addition of high amount of RAP to the asphalt mix, may make it prone to fatigue failure. Due to this reason, rejuvenators are added to restore some of the physical and chemical properties for desired performance of the mixture. In this study, a locally available non-edible oil known as Polanga oil (biological name: Calophyllum inophyllum) has been explored as rejuvenator to study its effect on performance of the aged binders. Aged binder prepared in the laboratory using the Pressure Aging Vessel (PAV) and binder extracted from the RAP collected from a nearby source were used in this study for rejuvenation. Aged binder and RAP binder mixed with the rejuvenator at varying percentages. The rheological characterizations in terms of flow, rutting, fatigue and creep recovery of rejuvenated PAV aged & RAP binders were carried out using a dynamic shear rheometer (DSR) to determine the optimum dosage of the rejuvenator. It was observed that, 5 percent of Polanga oil is able to divulge the desirable rheological properties of the rejuvenated binder.