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Materials and Structures

, Volume 30, Issue 9, pp 556–560 | Cite as

Performance of sacrificial anodes to protect the splash zone of concrete piles

  • Oladis T. de Rincón
  • Matilde F. de Romero
  • Aleida R. de Carruyo
  • Miguel Sánchez
  • José Bravo
Technical Notes

Abstract

This work describes research carried out at the Corrosion Studies Center, Universidad del Zulia, Venezuela, on the use of sacrificial anodes embedded in concrete to provide cathodic protection for reinforced concrete piles exposed to saline environments.

Different alloys of aluminum, zinc and magnesium were studied in the laboratory, determining their efficiency and evaluating their performance in a solution saturated with Ca(OH)2 and in mortar (Cl between 0.0 and 0.5%), using electrochemical techniques (potentials, linear and complete polarization). These results determined that the most efficient cathodic protection of the steel reinforcing the concrete was best afforded by the Al/Zn/In alloy. The alloy was evaluated at the field level, protecting reinforced concrete, and later applied to prestressed piles of the Rafael Urdaneta Bridge exposed to the brackish waters of Lake Maracaibo. It showed its effectiveness by protecting the steel at potentials on the order of −900 mV versus Cu/CuSO4.

Keywords

Venezuela Bridge Deck Splash Zone Cathodic Protection Test Pile 

Résumé

Cet article décrit des recherches menées au Centre des Études de Corrosion de l'Universidad del Julia, Venezuela, sur l'utilisation des anodes réactives enrobées dans du béton pour protéger des pieux en béton armé exposés à un milieu salin.

Des alliages différents d'aluminium, de zinc et de magnésium ont été étudiés en laboratoire pour déterminer leur efficacité et évaluer leur comportement dans une solution saturée de Ca(OH)2 et dans du mortier (Cl entre 0,0 et 0,5%), utilisant des techniques électrochimiques (potentiels, polarisation linéaire et complète). Ces résultats ont montré que la protection cathodique la plus efficace des aciers de renforcement du béton était fournie par l'alliage Al/Zn/In. Cet alliage a été évalué sur le site pour la protection du béton armé, et plus tard utilisé sur des pieux précontraints du Pont Rafael Urdaneta, exposés aux eaux saumâtres du Lac Maracaibo. Son efficacité à été démontrée par sa protection de l'acier à des potentiels de l'ordre de −900 mV versus Cu/CuSO4.

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References

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Copyright information

© RILEM 1997

Authors and Affiliations

  • Oladis T. de Rincón
    • 1
  • Matilde F. de Romero
    • 1
  • Aleida R. de Carruyo
    • 1
  • Miguel Sánchez
    • 1
  • José Bravo
    • 1
  1. 1.Centro de Estudios de CorrosiónUniversidad del ZuliaMaracaiboVenezuela

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