Investigating the dynamic creep and the indirect tensile performance of sasobit-modified warm asphalt mixtures

This study aims to investigate the dynamic creep, indirect tensile, and moisture damage performance of Sasobit-modified asphalt mixtures. The asphalt mixture specimens were prepared using the optimum asphalt content determined by the Superpave mixture design method. The performance in rutting and fatigue for asphalt mixtures has been estimated through dynamic creep and indirect tensile resilient modulus tests using the Universal Testing Machine (UTM). The dynamic creep test was conducted at two temperatures (25 °C and 40 °C) using a single loading frequency of 8 Hz. The indirect tensile test was performed at two temperatures (25 °C and 40 °C) with a frequency of 1 Hz. Based on the dynamic creep test results, the Sasobit modified asphalt mixtures have lower accumulated strains and higher creep stiffness than the control mixture at both 25 °C and 40 °C temperatures. Based on the indirect tensile test, the resilient modulus of the Sasobit-modified mixtures was greater than the control mixture. The moisture effect test results indicated that all modified mixtures pass the minimum required tensile strength ratio (TSR). Generally, the modified mixtures have shown enhanced behavior in terms of rutting, fatigue, and moisture damage resistance. Asphalt mixtures modified with 2 % Sasobit showed the best performance at 40 °C since it had the lowest accumulated strain, and the highest creep stiffness and resilient modulus.