Anisotropic behavior of bituminous material extracted from road pavement

What is it about?

Bituminous mixture, widely used in road construction, is generally considered as an isotropic material. In fact, the compaction during the road pavement construction can induce some anisotropic properties. Some specimens, sawn and cored from a highway in France, were tested. It finds that the mechanical properties of bituminous mixture are different depending on the specimen directions in the road pavement.

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Why is it important?

Our experimental results show that the stiffness and the Poisson's ratio of bituminous mixture specimens extracted from road pavement in three orthogonal material directions are different. The symmetry of rheological tensor and the condition giving the stability of material behavior are still respected.