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Structural performance of a 26-year-old corroded reinforced concrete beam / Inamullah Khan in European journal of environmental and civil engineering, Vol. 16 N° 3-4 (Mars/Avril 2012) 

Public ISBD [article]  in European journal of environmental and civil engineering > Vol. 16 N° 3-4 (Mars/Avril 2012) . - pp. 440-449 Titre : Structural performance of a 26-year-old corroded reinforced concrete beam Type de document : texte imprimé Auteurs : Inamullah Khan, Auteur ; Raoul François, Auteur ; Arnaud Castel, Auteur Année de publication : 2012 Article en page(s) : pp. 440-449 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Corrosion  Reinforced  concrete  Load-bearing  capacity  Stiffness  Ductility  Chloride Résumé : This article presents experimental results and the modelling of a highly corroded beam subjected to a chloride environment to assess the performance of long-term-corrosion-damaged beams. A reinforced concrete beam corroded by 26 years of exposure to a chloride environment was tested until failure, as was a control beam of the same age. Cracking maps and corrosion maps were drawn for the corroded beam. Force displacement curves for both beams and stress strain curves for the steel bars were also plotted. From the results it appears that corrosion has a significant impact on the load carrying capacity, stiffness and deflection of beams. The modelling approach using Macro Finite Element (MFE) shows good agreement with experimental results in terms of load capacity, stiffness of the beam and ultimate deflection. DEWEY : 624 ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/abs/10.1080/19648189.2012.667992 [article] Structural performance of a 26-year-old corroded reinforced concrete beam [texte imprimé] / Inamullah Khan, Auteur ; Raoul François, Auteur ; Arnaud Castel, Auteur . - 2012 . - pp. 440-449. Génie Civil Langues : Anglais (eng) in European journal of environmental and civil engineering > Vol. 16 N° 3-4 (Mars/Avril 2012) . - pp. 440-449 Mots-clés : Corrosion  Reinforced  concrete  Load-bearing  capacity  Stiffness  Ductility  Chloride Résumé : This article presents experimental results and the modelling of a highly corroded beam subjected to a chloride environment to assess the performance of long-term-corrosion-damaged beams. A reinforced concrete beam corroded by 26 years of exposure to a chloride environment was tested until failure, as was a control beam of the same age. Cracking maps and corrosion maps were drawn for the corroded beam. Force displacement curves for both beams and stress strain curves for the steel bars were also plotted. From the results it appears that corrosion has a significant impact on the load carrying capacity, stiffness and deflection of beams. The modelling approach using Macro Finite Element (MFE) shows good agreement with experimental results in terms of load capacity, stiffness of the beam and ultimate deflection. DEWEY : 624 ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/abs/10.1080/19648189.2012.667992

Study of the impact of localised cracks on the corrosion mechanism / Raoul François in European journal of environmental and civil engineering, Vol. 16 N° 3-4 (Mars/Avril 2012) 

Public ISBD [article]  in European journal of environmental and civil engineering > Vol. 16 N° 3-4 (Mars/Avril 2012) . - pp. 392-401 Titre : Study of the impact of localised cracks on the corrosion mechanism Type de document : texte imprimé Auteurs : Raoul François, Auteur ; Inamullah Khan, Auteur ; Ngoc Anh Vu, Auteur Année de publication : 2012 Article en page(s) : pp. 392-401 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Corrosion  Steel  bars  Cracks  Chloride Résumé : Corrosion is one of the major problems that the reinforced concrete industry is facing nowadays. Much research has been carried out to investigate the influence of cracks on rebar corrosion. In this project ring shaped mortar samples with an 8mm steel bar inside were cracked with different crack widths and then subjected to continuous wetting and drying cycles in salt solution having 35 g/L of NaCl, to accelerate the corrosion process in laboratory conditions. The samples were broken after 1.5 years and 2.5 years to observe the corrosion pattern. Results show that cracks whatever their width allow the corrosion onset at the bottom of cracks and along the steel–concrete interface damaged zone caused by the creation of cracks. This process leads to corrosion cracks formation time dependant of the crack opening, which modify the environmental conditions at the level of steel leading to the generalisation of corrosion all along the re-bars. DEWEY : 624 ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/abs/10.1080/19648189.2012.667982 [article] Study of the impact of localised cracks on the corrosion mechanism [texte imprimé] / Raoul François, Auteur ; Inamullah Khan, Auteur ; Ngoc Anh Vu, Auteur . - 2012 . - pp. 392-401. Génie Civil Langues : Anglais (eng) in European journal of environmental and civil engineering > Vol. 16 N° 3-4 (Mars/Avril 2012) . - pp. 392-401 Mots-clés : Corrosion  Steel  bars  Cracks  Chloride Résumé : Corrosion is one of the major problems that the reinforced concrete industry is facing nowadays. Much research has been carried out to investigate the influence of cracks on rebar corrosion. In this project ring shaped mortar samples with an 8mm steel bar inside were cracked with different crack widths and then subjected to continuous wetting and drying cycles in salt solution having 35 g/L of NaCl, to accelerate the corrosion process in laboratory conditions. The samples were broken after 1.5 years and 2.5 years to observe the corrosion pattern. Results show that cracks whatever their width allow the corrosion onset at the bottom of cracks and along the steel–concrete interface damaged zone caused by the creation of cracks. This process leads to corrosion cracks formation time dependant of the crack opening, which modify the environmental conditions at the level of steel leading to the generalisation of corrosion all along the re-bars. DEWEY : 624 ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/abs/10.1080/19648189.2012.667982