44 M.C. Teguedi et al. Fig. 7.1 Typical displacement fields for the 100% RAP specimen at TD 10 ıC (in pixels, 1 pixel D40 m). (a) Uxx, 20%RAP. (b) Uyy, 20% RAP. (c) Magnified deformed mesh obtained for the 100% RAP specimen at TD 10ıC are shown in Fig. 7.1. These displacements correspond to a difference in temperature equal to TD 30ıC. The displacement fields presented in Fig. 7.1a, b clearly illustrate the global contraction of the specimen along the vertical and horizontal direction. From these results, it is visible that the specimen shrinks toward its center. Another representation of the displacement fields is proposed in Fig. 7.1c. In this figure, the displacement fields are used to deform a regular mesh to help the reader figure out the deformation of the specimen. The pitch of the mesh is equal to 10 pixels and the displacement multiplied by 350 to give a clearer idea on the deformation of the specimen. This presentation is expressed in the deformed configuration. The overall contraction of the specimen towards its center is clearly visible. This contraction is mainly sustained by the mastic. Strain maps which are deduced from these displacement maps then enable us to characterize, among others, the in-situ coefficient of thermal expansion of the binder. Finally, it can be concluded that the paper brings new information on the thermal contraction/expansion of asphalt materials at length scales ranging from binder to the mixture scales. In particular, it was possible to quantify the influence of the RAP on this response. Full details on these experiments can be found in [9].
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