Influence of compaction methods on physical-mechanical properties of cold recycled asphalt mixtures and pavement life
Fausto Bisanti, Nicola Carbutti, Eshan Dave, Jo E. Sias, Elena Romeo, Gabriele Tebaldi
Abstract
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.