Repairing corroded RC beam with near-surface mounted CFRP rods |
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Authors: | Amjad Kreit Firas Al-Mahmoud Arnaud Castel Raoul François |
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Affiliation: | 1.Laboratoire Matériaux et Durabilité des Constructions (LMDC),Université de Toulouse, UPS, INSA,Toulouse,France;2.Institut Jean Lamour, Dpt CP2S, Equipe Matériaux pour le Génie Civil, Nancy Université,Villers-lès-Nancy Cedex,France |
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Abstract: | This experimental program investigates the possibility of using Carbon-Fiber-Reinforced Polymer (CFRP) rods to repair RC beams
damaged by steel corrosion. The 6-mm-diameter carbon-epoxy pultruded FRP rods were implemented in undamaged areas of the concrete
cover by using the Near Surface Mounted reinforcement (NSM) technique. The corroded beam tested was stored in a chloride environment
under service loading for 23 years, which was representative of real structural conditions. The corroded beam showed longitudinal
corrosion cracks more than 3 mm in width along the tension reinforcing bars. The repaired corroded beam was tested in three-point
flexure up to failure. Then, concrete was removed around the reinforcing bars in order to measure the real local steel cross-section
distribution. The maximum reduction in steel cross-section measured in the tension area was about 36% and was located at mid-span.
In spite of this heavy corrosion, the bearing capacity measured on the repaired beam was equal to that of the uncorroded control
beam. In our experimental conditions, the NSM technique was applicable for repairing corroded concrete structural members. |
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