Combined Effect of Warm Mix Processes and Multi-recycling on the Main Criteria of the French Asphalt Mix Design Method

The study reported here aims to precise the combined effect of warm mix processes and multi-recycling on the main criteria of the French asphalt mix design method. Asphalt concretes (AC) 0/10mm are produced at a semi-industrial scale for a combination of 3 recycling cycles, 3 production processes (hot, warm with additive and warm with foamed bitumen) and 2 recycling rates (40 and 70%). This combination is completed by a cycle without recycling for the 3 production processes, giving a total of 21 modalities. Compactibility, water sensitivity, stiffness modulus and fatigue tests are performed on the 21 AC produced. A principal component analysis (PCA) is then performed on the set of data obtained to extract the main trends.