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Effect of the processing conditions on the viscoelastic properties of a high-RAP recycled asphalt mixture: micromechanical and experimental approaches

Article dans une revue avec comité de lecture
Author
CHERIF, Rabeb
EDDHAHAK, Anissa
86289 Laboratoire Procédés et Ingénierie en Mécanique et Matériaux [PIMM]
GABET, Thomas
HAMMOUM, Ferhat
NEJI, Jamel

URI
http://hdl.handle.net/10985/18476
DOI
10.1080/10298436.2019.1640363
Date
2019
Journal
International Journal of Pavement Engineering

Abstract

With the depletion of the virgin aggregates, many efforts have been oriented towards the recycling of the reclaimed asphalt pavement (RAP). However, quality control of the recycled product is required during the manufacture process. This research deals with the use of high-content RAP recycled asphalt mixture composed of 70% RAP based on experimental and micromechanical approaches. For the experimental part, a "Good" and a "Bad" blended mixture were manufactured in laboratory. Then, rheological measurements of the complex modulus of the different binders and mixtures were carried out. The micromechanical work is based on the generalised self-consistent scheme (GSCS) which was used to predict the mechanical properties of the recycled mixture. This approach aims to homogenize the heterogeneous material by taking into account both the intergranular porosity and the possible interactions between phases. The confrontation of the micromechanical model with the experimental results showed good agreements between measured data and predicted values of the complex modulus of the recycled asphalt. Moreover, it was highlighted from the experimental results that the blending process of the recycled mixture has a great influence on the viscoelastic properties of the recycled mixture. This result was also validated by the GSCS-based approach.

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