Investigating the Effects of Ageing on the Properties of Hot Mix Asphalt Containing High Content of Reclaimed Asphalt Pavement Content and Waste Cooking Oil

In this study the effect of short and long term aging on the properties of recycled asphalt containing high percentage of reclaimed asphalt pavement (RAP) and rejuvenated by different dosages of waste cooking oil has been investigated. The coarse fraction of virgin aggregates was replaced with RAP, and the mixtures were rejuvenated by adding 0, 4, 7 and 10% (by the weight of total binder) of waste engine oil. The mixtures were short and long term aged and the volumetric properties, Marshall stability and flow and weight loss in Cantabro test were evaluated for the unaged and aged mixtures. Results reveal that the mixture containing RAP and without rejuvenation has higher VMA, Marshall stability, flow and weight loss in Cantabro test than the mixture made of virgin aggregates. The properties decrease with increasing oil content. Short term and long term ageing result in increase of VMA, Marshall stability and weight loss, and decrease of flow, with higher changes by long term ageing. Evaluation of ageing indices reveals that the effect of ageing increases with increasing oil content.