Abstract
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) 0/10 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 AC 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 AC 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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Acknowledgements
Acknowledgments are dedicated to the financial support of the French National Research Agency (ANR) in the framework of the national project IMPROVMURE (Innovation for Materials and Processes for Improving the Multi-Recycling of Mixes). Project-ANR-13-RMNP-0008.
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Marsac, P. et al. (2020). Combined Effect of Warm Mix Processes and Multi-recycling on the Main Criteria of the French Asphalt Mix Design Method. In: Raab, C. (eds) Proceedings of the 9th International Conference on Maintenance and Rehabilitation of Pavements—Mairepav9. Lecture Notes in Civil Engineering, vol 76. Springer, Cham. https://doi.org/10.1007/978-3-030-48679-2_34
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DOI: https://doi.org/10.1007/978-3-030-48679-2_34
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