The evaluation of the field performance of the neat and SBS modified hot mixture asphalt

•Neat and SBS modified hot mixture spread and compacted on a road with little traffic.•Cores taken from the side and middle part of the pavement at different time periods.•Stiffness modulus stability indirect tensile strength and fatigue resistance examined.•Excessive hardening at samples over time determined.•Temperature difference between neat and SBS modified cores 1–2 °C on the hottest days.•Linear relation between total temperature index and mechanical properties determined.

The reason of using additives in Hot Mix Asphalt (HMA) is related to shortage of raw materials, demand for a longer service life of roads, a need for better physical and mechanical properties of asphalt pavement and thus a decrease in the maintenance and repair expenses. Additives such as polymer are mostly used for this purpose. In the present study, firstly the stiffness modulus, Marshall Stability, indirect tensile and fatigue resistance of the core samples collected at four different periods over a year from a road which is comprised of neat and styrene–butadiene–styrene (SBS) modified HMAs are examined. Secondly, how the qualities of the pavement are influenced by the temperature and environmental factors over a year was examined.