| Summary: | The utilization of reclaimed asphalt mixture, which combines old asphalt reclaimed material (RAP) with new aggregate, holds significant environmental benefits. However, the road performance of this mixture can decline due to the degradation of the old asphalt components. In this study, the shape characteristics of both old and new aggregates were analyzed using IPP6.0 software. Notably, the roundness of old aggregates within the 9.5–16 mm range exhibited the most substantial wear. Consequently, an investigation was conducted on the road performance implications of incorporating 30% RAP and its associated impact on aggregate roundness. The research findings indicated that there was minimal disparity in roundness between new and old aggregates within the particle size range of 4.75 mm to 9.5 mm. Nevertheless, as the proportion of old aggregates exceeding 9.5 mm increased, the recycled asphalt mixture exhibited reduced low-temperature and high-temperature performance, as well as diminished water stability.
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