Evaluation of Rutting Performance of Warm Mix Asphalt

In recent years, environmental protection is increasingly becoming a major issue in transportation including asphalt production. Despite the fact that hot mix asphalt (HMA) is widely used around the world, some recent studies suggest that using warm mix asphalt (WMA) technology reduces the production and placement temperature of asphalt mixes. Currently, a common way of producing WMA is through the utilization of additives. This paper firstly characterizes the effect of WMA additives (organic, chemical, water-containing additives) on base bitumen properties. Following the determination of optimum bitumen content of the mixtures with different WMA additives through Marshall test, Hamburg wheel-tracking device is used to measure the permanent deformation characteristics of WMA mixtures. Based on the findings of this study, the utilization of WMA additives helps in the reduction in viscosity values which in return decreases mixing and compaction temperature leading to the reduction in energy costs as well as emissions. Besides, it can be concluded that all WMA mixtures performed better than HMA mixtures in the matter of rut depth.