Laboratoire Regional des Ponts et Chaussees dAutun

Autun, France

Laboratoire Regional des Ponts et Chaussees dAutun

Autun, France

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Chataigner S.,Laboratoire Regional des Ponts et Chaussees DAutun | Rabasse M.,Laboratoire Regional des Ponts et Chaussees DAutun | Quiertant M.,University Paris Est Creteil | Benzarti K.,University Paris Est Creteil | Aubagnac C.,Laboratoire Regional des Ponts et Chaussees DAutun
3rd International fib Congress and Exhibition, Incorporating the PCI Annual Convention and Bridge Conference: Think Globally, Build Locally, Proceedings | Year: 2010

Externally bonded composite reinforcements are being used for several decades to repair and upgrade ageing structures. However, the durability of such strengthening systems under service conditions still remains a crucial issue. In this study, an experimental approach based on accelerated ageing tests (at 40°C and 95% of relative humidity) was carried out to investigate the durability of the adhesive bond between composite reinforcements and concrete. Two strengthening systems were considered, i.e., carbon fiber sheets and pultruded carbon plates, both associated with bi-component epoxy adhesives. Evolutions of mechanical property of the individual materials (concrete, epoxy, composites) and of the bonded interfaces were evaluated over a period of eighteen months by conventional tests carried out periodically. Additional DSC (differential scanning calorimetry) characterizations were also performed on the ambient temperature curing adhesives, in order to quantify microstructural changes induced by hydrothermal ageing. Changes in the mechanical behaviour of the epoxy material were observed their influence on the mechanical properties of the adhesive joint was discussed. Though, the phenomena are accelerated, the study gives good insight of the evolution for such adhesive joints on site, more particularly in the case of composite bonded reinforcement on concrete structures.


Sadone R.,University Paris Est Creteil | Quiertant M.,University Paris Est Creteil | Chataigner S.,Laboratoire Regional des Ponts et Chaussees DAutun | Mercier J.,Freyssinet International | Ferrier E.,University Claude Bernard Lyon 1
Advances in FRP Composites in Civil Engineering - Proceedings of the 5th International Conference on FRP Composites in Civil Engineering, CICE 2010 | Year: 2011

Building and bridge columns are particularly vulnerable when earthquakes occur. Retrofit of deficient reinforced concrete columns with CFRP jackets and bonded CFRP plates is an efficient method to increase their strength and ductility and then to enhance their seismic resistance. However, issues related to anchorage of the plates can be a concern when strengthening flexural concrete members. This study presents specific end-anchors reinforcement systems which were designed and tested under monotonic and low cycle fatigue loading and compared with a reference system commercially available. A total of 16 specimens were tested up to failure, to check the performances of these anchors. It appears that anchors increase the ultimate capacity and ductility of bonded plates. © Tsinghua University Press, Beijing and Springer-Verlag Berlin Heidelberg 2011.


Taillade F.,University Paris Est Creteil | Quiertant M.,University Paris Est Creteil | Benzarti K.,University Paris Est Creteil | Aubagnac C.,Laboratoire Regional des Ponts et Chaussees dAutun
Construction and Building Materials | Year: 2011

This paper presents two complementary techniques, shearography and pulsed stimulated infrared thermography, used to detect and characterize depth and width of the adhesion defects (delaminations or adhesive disbonds) of externally bonded fiber-reinforced polymers (FRP) on concrete surface structures. Shearography associated to a depressure load on the one hand, and step heating infrared thermography on the other hand are presented. In a first step, the feasibility study of the two methods is performed by using finite element method. Then, validation laboratory tests on specimens containing calibrated defects are carried out. Debonded areas were simulated by locally replacing the epoxy resin with non-adherent polytetrafluoroethylene (PTFE) discs at the concrete-to-FRP interface. Experimental results confirmed the effectiveness of the proposed method to detect and characterize subsurface debonds of FRP strengthening materials bonded on concrete structures. The complementarity of these methods is discussed. © 2010 Elsevier Ltd. All rights reserved.

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