Experimental and numerical investigation of the debonding interface between an old concrete and an overlay |
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Authors: | Q T Tran A Toumi J-L Granju |
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Affiliation: | (1) Laboratoire Matériaux et Durabilité des Constructions, Génie Civil INSA-UPS, 135 av. de Rangueil, 31077 Toulouse Cedex, France |
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Abstract: | The paper focuses on debonding propagation along an interface, notably on the major influence of the interlocking between
the two faces of the debonding interface. The aim of the study is to obtain the data necessary for relevant and efficient
debonding modelling. The work associates experiment and simulation with the purpose of quantifying the interlocking along
the interface. The overlay material investigated was a fibre reinforced mortar (FRM). Direct tension tests of notched FRM
specimens were firstly conducted to obtain the tensile strength and the residual normal stress—crack width relationship. Its
Young's modulus was determined from compression tests. The substrate-overlay interface was investigated by direct tension
tests and flexure tests performed on composite substrate-overlay specimens. The direct tension tests provided the interface
tensile strength and the relationship between debonding-opening and residual normal tensile stress. Three point flexural static
tests informed on the structural behaviour of the interface. The debonding interface propagation was monitored using a video-microscope
with a maximum enlargement of ×175.
Using the identified and quantified parameters, modelling of the above mentioned static tests was carried out by the finite
elements method using CAST3M code developed in France by CEA (Centre for Atomic Energy). The comparison of modelling and experiment
results shows a good coherence and proves the important role of interlocking on the debonding mechanism. |
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Keywords: | repairs thin bonded overlays interface debonding interlocking shrinkage experiment vs modelling cohesive crack concept |
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