NDLI: The influence of corrosion on bond properties between concrete and reinforcement in concrete structures

Content Provider	Springer Nature Link
Author	Ouglova, Anna Berthaud, Yves Foct, François François, Marc Ragueneau, Frédéric Petre Lazar, Ilie
Copyright Year	2007
Abstract	The rebar corrosion in reinforced concrete is one of the most extensive pathologies affecting the performance of concrete structures. Chloride-induced rebar corrosion damage results mainly from the use of de-icing salts in cold climates and/or exposure to marine environments. Carbonation damage is a further important degradation mechanism. The internal consequences of corrosion are the modification of the steel behavior and degradation of the steel–concrete bond. This work is devoted to the influence of the controlled corrosion on the adherence between steel and concrete. A new geometry of specimen has been designed to: (i) avoid the lateral confining stresses that appear during the classical pullout tests and (ii) permit to impose a known confinement for the study of its influence on the behavior of the interface. Five specimens with different levels of corrosion have been tested in this contribution. Reinforcing bars embedded in concrete were submitted to accelerated corrosion using an external current source. The magnitude of corrosion was measured using both Faraday’s law and the weight loss method. The level of corrosion varied from 0% to 0.76%. The geometry of the specimens allowed us to take series of digital pictures during the tests, which were analyzed using a digital image correlation, the procedure named CORRELI$^{LMT}$. The results of pullout tests proposed in this contribution indicate that: (i) levels of corrosion that are less than 0.4% of weight loss improves the bond stress and (ii) levels of corrosion resulting in more than 0.4% of weight loss lead to a reduction of the bond stress value.La corrosion des armatures du béton armé est une des pathologies qui altèrent les performances des structures. La corrosion peut être provoquée par les sels de déverglaçage dans les zones soumises au gel et/ou aux embruns marins. La carbonatation constitue une autre source de dégradation. Les conséquences de cette corrosion sont la modification du comportement de l’acier et la dégradation de l’interface acier béton. Ce travail est consacré à l’analyse de l’influence de la corrosion contrôlée sur l’adhérence acier béton. Une nouvelle éprouvette a été imaginée afin (i) d’éliminer les contraintes latérales (de confinement) qui apparaissent dans les essais classiques d’arrachement et (ii) de pouvoir imposer ce confinement (par un système non décrit dans ce papier) pour l’étude de son influence sur le comportement de l’interface. Cinq éprouvettes avec différents taux de corrosion ont été testées dans ce travail. Les aciers ont été soumis à une corrosion accélérée par imposition d’un courant électrique. Le taux de corrosion a été mesuré à la fois par pesée et en utilisant la loi de Faraday. Le taux de corrosion utilisé dans cette étude varie de 0 à 0,76%. La géométrie de l’éprouvette autorise la prise de clichés par une caméra CCD ; les analyses des images ont été faites avec le logiciel CORRELI$^{LMT}$. Les résultats de ces nouveaux essais d’arrachement montrent que : (i) un taux de corrosion inférieur à 0,4% améliore les propriétés de l’interface acier béton, (ii) un taux de corrosion supérieur à cette valeur dégrade cette interface.
Starting Page	969
Ending Page	980
Page Count	12
File Format	PDF
ISSN	13595997
Journal	Materials and Structures
Volume Number	41
Issue Number	5
e-ISSN	18716873
Language	English
Publisher	Springer Netherlands
Publisher Date	2007-09-21
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Corrosion Concrete interface Experiment Identification Building Materials Civil Engineering Operating Procedures, Materials Treatment Mechanical Engineering Theoretical and Applied Mechanics Structural Mechanics
Content Type	Text
Resource Type	Article
Subject	Building and Construction Mechanics of Materials Materials Science Civil and Structural Engineering

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