Mixed-mode debonding approach to evaluate water sensibility in bi-layer composite pavement

Armelle Chabot (1) , Ferhat Hammoum (2) , Manitou Hun (3)

1 IFSTTAR/MAST/LAMES - Laboratoire Auscultation, Modélisation, Expérimentation des infrastructures de transport
2 IFSTTAR/MAST/MIT - Matériaux pour Infrastructure de Transport
3 LBL International

In order to evaluate water sensibility on the interfacial properties between layers of composite pavements, a four-point bending (4PB) test on bilayer structure in a water bath is proposed. Using the virtual crack closure technique, the individual strain energy release rates are calculated with a specific model. The debonding driven by Mode I failure is recognized as the main mode. For bilayer specimens made of a cement concrete overlay on bituminous material, the specific test has shown a competition between the different failure mechanisms. A very good bond resistance between layers compared to the fracture tension resistance of the cement concrete layer is observed. In this work, first results of the water effect on the behavior of such a material interface are presented. The final fracture length of the specimens, curves of force-displacements and first digital image correlation results show the influence of water immersion on the debonding failure mode.

Mots clés: water; debonding; four-point bending test; composite pavements

Mots clés: DECOLLEMENT; ESSAI; MATERIAU; CHAUSSEE; ESSAI DE FLEXION; COMPOSITE

Domaines: Matériaux; Infrastructures de transport; Matériaux et structures en mécanique [physics.class-ph]

Armelle Chabot, Ferhat Hammoum, Manitou Hun. Mixed-mode debonding approach to evaluate water sensibility in bi-layer composite pavement. 8th International conference on Mechanisms of Cracking and Debonding in Pavements (MCD2016). Chabot A., Buttlar W.G., Dave E.V., Petit C., Tebaldi G. (Eds), RILEM bookseries, vol. 13, Jun 2016, Nantes, France. pp.613-618, ⟨10.1007/978-94-024-0867-6_86⟩. ⟨hal-01338327⟩