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Times to cracking in reinforced mortar beams subjected to accelerated corrosion tests

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Abstract

This paper is devoted to the description of the effects of corrosion on mechanical behaviour of reinforced mortar beams. Corrosion tests have been performed through accelerated tests for two configurations of beams (rebar at the corner or in the middle). Critical times related to the development of cracking have been defined by using strain measurements, potential drop and visual observations. Our results showed that the crack pattern and the kinetic of cracking both depend upon the position of rebar. Furthermore, in order to predict the “times to cracking”, an analytical model (hollow cylinder subjected to inner pressure) was used with a set of experimental data related to the thickness and the displacement of the steel/mortar interface. Our results showed that these times depend upon the outer radius of the used hollow cylinder which is about equal to the length of the through crack.

Résumé

L’objectif de cette étude est de décrire l’effet mécanique de la couche de rouille dans des éprouvettes de mortier armé soumises au processus de corrosion accéléré par imposition de courant pour deux configurations de poutres (armature au coin ou au milieu). Nous avons mis en évidence des temps dits critiques de fissuration par différentes techniques: mesure des déformations, détermination de la différence de potentiel et observations visuelles. Nous avons montré que le faciès de fissuration ainsi que la cinétique de fissuration dépendent de la position de l’armature. De plus, afin de prédire les temps critiques de fissuration, nous avons utilisé un modèle analytique (cylindre creux soumis à des pressions internes) en utilisant des données au niveau de l’interface acier/mortier (épaisseur de la couche de rouille, déplacement). Nos résultats ont montré que le temps de fissuration sur la surface extérieure peut être prédit si le rayon extérieur du cylindre creux est pris égal à la longueur de la fissure traversante.

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Acknowledgments

This research has been supported by CEA (French Atomic Energy Commission), EDF (Electricité De France) and LCPC (Laboratoire Central des Ponts et Chaussées). The study is part of the CIMETAL program of CEA. The authors are grateful to Paul Bujar and Jean-Pierre Martineau of the Civil Engineering Department of the “Ecole Normale Supérieure de Cachan (ENS Cachan) for the casting of the beams and the strain measurements by gauges.

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Authors and Affiliations

  1. Université Paris-Est, UR Navier, LMSGC (CNRS/LCPC/ENPC), 2 allée Kepler, 77420, Champs sur Marne, France

    S. Caré

  2. ENS Cachan/CNRS/UPMC/PRES UniverSud Paris, LMT-Cachan, 61 avenue du Président Wilson, 94235, Cachan, France

    Q. T. Nguyen, K. Beddiar & Y. Berthaud

  3. Ecole d’ingénieurs CESI, 116 avenue Aristide Briand, 92220, Bagneux cedex, France

    K. Beddiar

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  1. S. Caré
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  2. Q. T. Nguyen
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  3. K. Beddiar
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  4. Y. Berthaud
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Correspondence to S. Caré.

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Caré, S., Nguyen, Q.T., Beddiar, K. et al. Times to cracking in reinforced mortar beams subjected to accelerated corrosion tests. Mater Struct 43, 107–124 (2010). https://doi.org/10.1617/s11527-009-9474-2

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