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 determine the combined effect of warm mix processes and multi-recycling on the main criteria of the French asphalt mix design method. Asphalt concretes (ACs) 0/10 mm 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 ACs produced. A principal component analysis (PCA) is then performed on the set of data obtained to extract the main trends. No drastic change is detected in the properties as all the ACs produced comply with the French requirements for water sensitivity, stiffness modulus and fatigue. The main significant trends observed through PCA are a decrease of the workability and the compactibility and an increase of the water sensitivity with reclaimed asphalt (RA) addition and multi-recycling. It is also observed that high recycling rate (70% RA) tends to increase the constant of the fatigue line but also its slope, reflecting an increased sensitivity of the fatigue resistance to the strain level.


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  • Accession Number: 01898048
  • Record Type: Publication
  • ISBN: 9783030486785
  • Files: TRIS
  • Created Date: Oct 31 2023 4:42PM