The aim of this paper is to present a specific four-point bending test with a specific model to help investigate the crack initiation and propagation at the interface between layers of composite pavements. The influence of the geometry on the delamination phenomenon in specimens is analyzed. Considering the deflection behavior of specimens, both experimental and analytical results are compared. Two different types of interface (concrete / asphalt and asphalt / concrete) are tested in static conditions. Different failure mechanisms whose mainly delamination is observed. The crack mouth opening displacement is monitoring by means of linear variable differential transducer (LVDT). The strain energy release rate is provided and compared successfully to the literature.
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.
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