Concrete cracking due to chloride-induced reinforcement corrosion / R. Zhang in European journal of environmental and civil engineering, Vol. 16 N° 3-4 (Mars/Avril 2012)  

Public ISBD [article]  inEuropean journal of environmental and civil engineering > Vol. 16 N° 3-4 (Mars/Avril 2012) . - pp. 402-413 Titre : Concrete cracking due to chloride-induced reinforcement corrosion : Influence of steel–concrete interface defects due to the ‘top-bar effect’ Type de document : texte imprimé Auteurs : R. Zhang, Auteur ; A. Castel, Auteur ; R. François, Auteur Année de publication : 2012 Article en page(s) : pp. 402-413 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Reinforced concrete Chloride corrosion Steel–concrete interface Cracking Résumé : This article deals with the influence of the steel–concrete interface condition on reinforcement corrosion and concrete cracking in a chloride environment. Four large concrete members were cast with horizontal reinforcements at different levels in order to create voids under the upper horizontal bars due to the well-known ‘top-bar effect.’ Then, the members were sawn into smaller specimens that included one rebar. Specimens obtained were submitted to wetting–drying cycles in salt water (natural corrosion process) until concrete cracking was observed. Results show that before concrete cracking, the corrosion pattern observed is completely different between the specimens with defect (generalised corrosion) or without defect (local pitting corrosion). The concrete cracking is delayed for specimens affected by the ‘top-bar effect’ in spite of a higher corrosion rate, and occurs at a significantly higher corrosion rate. A new model for uniform steel cross-section reduction calculation from concrete crack width in case of ‘Top-bar effect’ is proposed. DEWEY : 624 ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/abs/10.1080/19648189.2012.667984 [article] Concrete cracking due to chloride-induced reinforcement corrosion : Influence of steel–concrete interface defects due to the ‘top-bar effect’ [texte imprimé] / R. Zhang, Auteur ; A. Castel, Auteur ; R. François, Auteur . - 2012 . - pp. 402-413. Génie Civil Langues : Anglais (eng) in European journal of environmental and civil engineering > Vol. 16 N° 3-4 (Mars/Avril 2012) . - pp. 402-413 Mots-clés : Reinforced concrete Chloride corrosion Steel–concrete interface Cracking Résumé : This article deals with the influence of the steel–concrete interface condition on reinforcement corrosion and concrete cracking in a chloride environment. Four large concrete members were cast with horizontal reinforcements at different levels in order to create voids under the upper horizontal bars due to the well-known ‘top-bar effect.’ Then, the members were sawn into smaller specimens that included one rebar. Specimens obtained were submitted to wetting–drying cycles in salt water (natural corrosion process) until concrete cracking was observed. Results show that before concrete cracking, the corrosion pattern observed is completely different between the specimens with defect (generalised corrosion) or without defect (local pitting corrosion). The concrete cracking is delayed for specimens affected by the ‘top-bar effect’ in spite of a higher corrosion rate, and occurs at a significantly higher corrosion rate. A new model for uniform steel cross-section reduction calculation from concrete crack width in case of ‘Top-bar effect’ is proposed. DEWEY : 624 ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/abs/10.1080/19648189.2012.667984

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