What is it about?
Considering that water may cause a separation of interfaces between layers of pavement structures, specific test on bi-layer specimens is performed in a water bath. For the study of the bond between layers made of cement concrete overlay on bituminous material, four-point bending results show a competition between different failure mechanisms.
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Why is it important?
In such a mixed mode test the debonding mode I should be recognised as the main failure mode. The M4–5n analysis shows also that this test lead firstly to instable crack propagation (Chabot et al., 2013b). Compared with other different teams involved in the Rilem TC241-MCD with other couple of materials (Chabot, Buttlar, Dave, Petit, & Tebaldi, 2016a), all of this research work aims to deep the knowledge of debonding mechanisms in pavements.
Perspectives
Of course more tests are needed to confirm all these assumption, but these few experimental observations obtained here and the analysis of data by our macro modelling approach gives an idea on the different phenomena existing during the delamination process. The few fracture energy values obtained for bi-layer UTW specimen are in the range of ones obtained by pure Mode I test (Gharbi et al., 2017; Tchegg et al., 2007).
Dr. Armelle Chabot
Read the Original
This page is a summary of: A 4pt bending bond test approach to evaluate water effect in a composite beam, European Journal of Environmental and Civil engineering, April 2017, Taylor & Francis,
DOI: 10.1080/19648189.2017.1320237.
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