Influence of Permeation of Oxygen and Chloride ions Through Joints on Macro-Ceil Corrosion

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Title: Influence of Permeation of Oxygen and Chloride ions Through Joints on Macro-Ceil Corrosion

Author(s): S. Nagataki, N. Otsuki, A. Moriwake and S. Miyazato

Publication: Special Publication

Volume: 170

Issue:

Appears on pages(s): 1333-1356

Keywords: Corrosion; chlorides; joints (junctions); oxygen; permeability.

Date: 7/1/1997

Abstract:
In this study, the macro-cell induced corrosion behavior of steel bars embeded in concrete members was experimentally investigated specially for the influence of the permeation of oxygen and chloride ions throught joints. Steel bars composed of 7 elements were embedded in mortar or concrete, and repair materials such as polymer cement mortar. The electric current flowing in the steel bars, the polarization resistances, and the potentials of the steel bars, as well as the macro-cell and micro-cell current densities of the steel bars were measured. The differences between the type of joints and the permeation of oxygen and chloride were then studied. The influence of the quality of repair materials on the macro-cell corrosion was also investigated. Results showed that the permeation of oxygen and chloride ions through the joint and the qualities of the repaired concrete members played important roles in macro-cell corrosion behavior. Results showed that the permeation of oxygen and chloride ions through the joint and the qualities of the repaired concrete members played important roles in macro-cell corrosion behavior.Results showed that the permeation of oxygen and chloride ions through the joint and the qualities of the repaired concrete members played important roles in macro-cell corrosion behavior.