The Performance of Warm Mix Asphalt Using Waste Cooking Oil as an Additive

It is prevalent nowadays to incorporate rubber or polymer into the asphalt binder as an additive to produce better asphalt mixtures, resulting in more durable, resilient, and high-performance road surfaces. Incorporating rubber or any additive materials in asphalt mixtures undoubtedly affects the production and construction processes in several ways, such as by increasing the production and construction temperature. Higher rubberised asphalt mixing production temperatures increase energy consumption and harmful gas emissions. In order to reduce the adverse effect of rubberised modified asphalt, warm mix asphalt (WMA) technology was introduced as an alternative asphalt production method to lower the asphalt mix production plant and construction at the job site. Although there are several WMA additive options in the market, the use of waste cooking oil (WCO) as a WMA additive is widely explored as a response to waste management issues and to reuse the waste materials in asphalt construction to reduce the asphalt production temperature. This study aims to assess the performance of rubberised WMA using WCO as an additive. The samples were tested for resilient modulus, creep test, moisture susceptibility and Cantabro loss. The results showed that the combination of rubberised asphalt and WCO in WMA is possible to improve moisture damage and asphalt durability. Overall, it can be concluded that the performance of rubberised warm mix asphalt using WCO additive was comparable with conventional hot mix asphalt.