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Study of reinforced concrete slabs after three years of cathodic protection under severe conditions

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Abstract

The objective of this study is to determine the influence of cathodic protection on the properties of concrete cover in concrete slabs. To accelerate deterioration, the slabs were subjected to freezing and thawing cycles and sprayed with sodium chloride solution. Cathodic protection was applied to the reinforcements for three years. Then, the test pieces underwent physico-chemical analysis. Scanning electron microscopy and X-ray spectrometry were used to study the reinforcement-concrete interface, in particular for detecting alkali-silica reaction due to the alkalization. Carbonation depths, chloride penetration profiles and examinations of the reinforcements showed the good condition of the concrete cover and the beneficial effect of the cathodic protection of embedded steel.

Résumé

Cette étude a pour objectif la détermination de l'influence de la protection cathodique des armatures sur les caractéristiques du béton de recouvrement. Des dalles en béton armé ont été soumises à des cycles de gel-dégel et à un arrosage de saumure pour accélérer les dégradations. La protection cathodique a été appliquée de façon concomitante. Après une période de trois ans, les corps d'épreuves ont fait l'objet d'analyses physico-chimiques. La microscopie électronique à balayage et la diffraction des rayons X ont permis l'étude de l'interface acier-béton, en particulier pour mettre en évidence la présence de gels silico-alcalins résultant de l'alcalinisation du milieu. La mesure des profondeurs de carbonatation et des teneurs en chlorures ainsi que l'observation des aciers ont montré une bonne conservation du béton de recouvrement et l'influence bénéfique de la protection cathodique sur l'intégrité des armatures dans le béton.

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Authors and Affiliations

  1. Laboratoire Central des Ponts et Chaussées-58, bd Lefebvre, 75732, Paris Cedex 15, France

    T. Chaussadent & A. Raharinaivo

  2. Laboratoire Régional des Ponts et Chaussées, BP 505, 77500, Melun Cedex, France

    G. Grimaldi

  3. Laboratoire Matériaux et Durabilité des Constructions, INSA-UPS Génie Civil, Complexe Scientifique de Rangueil, 31077, Toulouse Cedex, France

    G. Arliguie & G. Escadeillas

Authors
  1. T. Chaussadent
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  2. A. Raharinaivo
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  3. G. Grimaldi
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  4. G. Arliguie
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  5. G. Escadeillas
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Additional information

Editorial note G. Arliguie is a RILEM Senior Member She is Chairlady of TC 163-TPZ (Interfacial Transition Zone and Properties of transfer) and an active menber of 154-EMC (Elechemical techniques for measuring Metallic Corrosion in concrete). T Chaussadent and A. Raharinaivo are working at LCPC, a RILEM Titular Member.

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Chaussadent, T., Raharinaivo, A., Grimaldi, G. et al. Study of reinforced concrete slabs after three years of cathodic protection under severe conditions. Mat. Struct. 30, 399–403 (1997). https://doi.org/10.1007/BF02498562

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  • DOI: https://doi.org/10.1007/BF02498562

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