ABSTRACT
The use of Reclaimed Asphalt (RA) or Reclaimed Asphalt Pavement (RAP) in flexible pavements results in energy savings, material cost savings and conservation of natural resources. In order to maximize the benefits/savings from RA use, the tendency nowadays is to incorporate as much RA as possible in recycled asphalt mixtures. In this study a reference and two recycled asphalt concrete mixtures produced and tested. The recycled mixtures produced with 50% RAP and two different penetration grade bitumen (50/70 and 70/100). The aggregate gradation and binder content was kept the same in all mixtures tested. The performance of all mixtures was determined in terms of stiffness (IT-CY) and fatigue resistance (ITT-CY), at 20 °C. Stiffness was determined at four testing temperatures (0°C, 10°C, 20°C and 30°C) and at five levels of risetime (40 ms, 64 ms, 124 ms, 155 ms and 200 ms) per testing temperature. Results have shown that stiffness increases with the incorporation of 50% RAP. The highest stiffness was obtained by the mixture with 50% RAP and 50/70 bitumen. The recycled asphalt concrete mixture with 50% RAP and 70/100 bitumen showed the best fatigue performance of all mixtures tested.
