Laboratory assessment of performance of WMA containing Sasobit

Abstract

Over the time, comparing with the traditional hot mix asphaltic (HMA) mixture, the warm mix asphaltic (WMA) mixture has become extremely widespread in the construction projects of highways because the WMA mixture provides the possibility of manufacturing asphalt mixes at a lower temperature than the traditionally utilized HMA. Thus, it reduces energy consumption, decreases CO2 emissions and improves the quality of the environment. The goal of this research was to determine the impact of the Sasobit addition on the sensitivity of mixes to permanent deformation and moisture. Under the framework of this study, four percentages of Sasobit were added are 1.0, 2.0, 3.0, and 4.0 % to investigate the effect of increasing Sasobit content on the moisture and rutting resistance of asphalt mixtures. In summary, the rut of WMA, which was tested in the Hamburg Wheel Tracking Device (HWTD), was decreased as compared to the control HMA, while the rut depth was even lower at 1.0, 2.0, and 3.0 % than that of 4.0 % Sasobit. The moisture resistance was decreased (as compared to conventional HMA) by Sasobit addition, as shown by reducing the tensile strength ratios (TSR), but it was still higher than the minimum of 80%.