Mechanical characteristics of reclaimed asphalt pavement under the action of intelligent gyratory compaction

Five different RAPs were selected to perform gyratory compaction test at different testing temperatures (60 ℃ and 110 ℃) and compaction speeds (0.5 mm/s, 1.5 mm/s, 2.5 mm/s and 3.5 mm/s). The mechanical parameters (stress and strain) were recorded through AFG2 PINEPAVETM which was incorporated into the gyratory compactor. Results show that the stress and strain increase gradually with the compaction of RAPs. Different RAPs exhibit diverse stress and strain values under different temperatures and speeds of gyratory compaction. However, the changing rate of strain is almost the same with regard to different RAPs. The properties of RAP can be indirectly reflected based on these mechanical parameters, which is helpful for the evaluation of RAP performance and design of regenerated asphalt mixture.