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Durability of hot and warm asphalt mixtures containing high rates of reclaimed asphalt at laboratory scale

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Abstract

Within the framework of a sustainable development, manufacturing bituminous mixtures while reducing energy and using less new aggregates and new bitumen may be considered as an important topic, according to the quantities of asphalts mixtures produced for creating and maintaining road networks. This work aims to study the interest and the potential problems when coupling the warm mix asphalt technology (WMA) and the use of high ratio of reclaimed asphalt pavement (RAP) in the mixture. Initially, a study on managing RAP is performed, aiming to show that separating RAP aggregates in several fractions leads to a higher control of RAP in terms of homogeneity. Homogeneity of RAP is a key point for increasing recycling rates. The present study coupling WMA and RAP is based on the French design method for manufacturing asphalt concretes, which includes gyratory compaction tests, French wheel tracking tests, complex modulus tests and fatigue tests. However, the French design method does not take into account the physical and chemical aging of bituminous mixtures with time. As we consider that coupling WMA and RAP may lead to aging problems, it was decided to use an aging process before performing the standard tests. The results show that a WMA containing a high ratio of RAP has good performances according to the standard relative to this material, whatever the test. However, this material tends to be more sensitive to fatigue than hot and warm mixes without RAP.

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Acknowledgments

The authors would like to thank the financial support of Coordenação de Aperfeiçoamento de Pessoal de Nível Superior—CAPES (Sandwich Doctoral Program (PDSE/CAPES)) and Conselho Nacional de Desenvolvimento Científico e Tecnológico—CNPq (Science without Borders (SwB) program - Doctorate Sandwich Abroad (SWE)).

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Authors and Affiliations

  1. Department of Transportation Engineering, Polytechnic School of the University of São Paulo (EPUSP), São Paulo, SP, Brazil

    Manuela Lopes & Liedi Bernucci

  2. IFSTTAR, MAST, LUNAM University, 44341, Bouguenais, France

    Thomas Gabet

  3. Centre for Studies and Expertise on Risks, Environment, Mobility, and Urban and Country Planning, CEREMA, Aix-en-Provence, France

    Virginie Mouillet

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  1. Manuela Lopes
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  2. Thomas Gabet
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  3. Liedi Bernucci
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  4. Virginie Mouillet
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Correspondence to Manuela Lopes.

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Lopes, M., Gabet, T., Bernucci, L. et al. Durability of hot and warm asphalt mixtures containing high rates of reclaimed asphalt at laboratory scale. Mater Struct 48, 3937–3948 (2015). https://doi.org/10.1617/s11527-014-0454-9

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  • DOI: https://doi.org/10.1617/s11527-014-0454-9

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