Influence of compaction methods on physical-mechanical properties of cold recycled asphalt mixtures and pavement life

Cold recycling techniques offer environmentally and economically sustainable solution for asphalt pavement rehabilitation, allowing the reuse of up to 100% reclaimed asphalt pavement (RAP). This approach not only preserves natural resources but also reduces energy consumption, making it a priority for sustainable road construction. Compaction is critical in cold recycled mixtures as it directly influences their density, mechanical behaviour, and long-term performance.This study examines the effects of three compaction methods (modified Proctor, gyratory, and vibratory hammer compaction) on the physical-mechanical properties of cold recycled mixtures (CRMs). It also includes an evaluation of long-term pavement performance. The results revealed that compaction energy application methods significantly affect mixture properties. In particular, the compaction method affects the moisture-density relationship, with moisture content playing a critical role in mechanical behaviour. The study further indicated that gyratory compactor yields the best physical-mechanical properties of CRMs, whereas vibratory hammer compaction tends to underestimate performance.