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Long-term behavior of CFRP reinforcement glued on concrete
Composite materials find their application in civil engineering in the strengthening of reinforced concrete pre-stressed concrete structures. The bending design of these structures can be realised by a linear method taking into account the properties of the composite-to-concrete interface. Results obtained by Varastehpour bring out the need to know the evolution of the long-term mechanical of these repairs. The research presented here aims at determining in the long-term behaviour a composite repair. The mechanical characteristics of the polymer at the interface between the concrete and carbon fibres are evaluated by performing tests of thermo-stimulated creep. These tests have brought out the following points: (i) the shear modulus in dry environmental conditions at 20 degrees C is decreased by 80 % during the first month of loading, and (ii) the shear modulus in dry environmental conditions at WC is decreased by 70 % during the same period. The thermo-stimulated analyses performed in this study are compared with long term results; those tests have shown that the final value of the shear modulus can be predicted within an accuracy of 10 % for a six months period. The method of non-linear calculation allows the bending design of composite reinforcement. This method uses major calculation rules of the reinforced concrete, by taking into account the composite fabrics slipping from its support. This methodology can be used to evaluate mechanical properties of adhesive layer with variable environmental exposure (moisture), or under cyclic loading. The knowledge of those mechanical properties allow to design a beam taking into account all the evolution of mechanical properties of materials. These conclusions are actually less catastrophic and do not question the repair principle insofar as the classical mechanical functioning of the beam in tension is challenged by a behaviour of far more complex structure.
Long-term behavior of CFRP reinforcement glued on concrete
Composite materials find their application in civil engineering in the strengthening of reinforced concrete pre-stressed concrete structures. The bending design of these structures can be realised by a linear method taking into account the properties of the composite-to-concrete interface. Results obtained by Varastehpour bring out the need to know the evolution of the long-term mechanical of these repairs. The research presented here aims at determining in the long-term behaviour a composite repair. The mechanical characteristics of the polymer at the interface between the concrete and carbon fibres are evaluated by performing tests of thermo-stimulated creep. These tests have brought out the following points: (i) the shear modulus in dry environmental conditions at 20 degrees C is decreased by 80 % during the first month of loading, and (ii) the shear modulus in dry environmental conditions at WC is decreased by 70 % during the same period. The thermo-stimulated analyses performed in this study are compared with long term results; those tests have shown that the final value of the shear modulus can be predicted within an accuracy of 10 % for a six months period. The method of non-linear calculation allows the bending design of composite reinforcement. This method uses major calculation rules of the reinforced concrete, by taking into account the composite fabrics slipping from its support. This methodology can be used to evaluate mechanical properties of adhesive layer with variable environmental exposure (moisture), or under cyclic loading. The knowledge of those mechanical properties allow to design a beam taking into account all the evolution of mechanical properties of materials. These conclusions are actually less catastrophic and do not question the repair principle insofar as the classical mechanical functioning of the beam in tension is challenged by a behaviour of far more complex structure.
Long-term behavior of CFRP reinforcement glued on concrete
Das Langzeitverhalten von Kohlenstoffaserverstärkungen, die auf Beton geklebt wurden
Ferrier, E. (Autor:in) / Hamelin, P. (Autor:in)
Techtextil, Techtextil Symposium, 8 ; 5 ; 1-6
1999
6 Seiten, 7 Bilder, 3 Quellen
(nicht paginiert)
Aufsatz (Konferenz)
Englisch
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