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Title: Chloride removal by intermittent cathodic protection applied to reinforced concrete in the tidal zone

Abstract

A basis for protecting steel in concrete using intermittent cathodic protection (CP) is provided by the removal of chloride ions from the surface of the steel. The present study reported on parallel, experimental, and theoretical investigations undertaken to study chloride removal effects induced by an intermittent CP current in a tidal zone situation. Factors that affected the short-term chloride removal efficiency included the resistivity of concrete, charge passed, treatment duration, initial chloride content, concrete cover, and chloride diffusion coefficient. Very high extraction efficiencies initially were observed sometimes, possibly as the result of pressure-induced flow of the pore solution resulting from the generation of gas at the cathode. Chloride removal appeared to be limited by the rate of release of bound chloride within the period of treatment if a high charge was applied in a limited period of time. However, in the long term, the chloride profile reached a steady state governed only by the concentration gradients and the average applied electric field determined by the charge passed in a given time and the resistivity. This may be used to select the steady-state design current density.

Authors:
; ;  [1]
  1. Imperial Coll., London (United Kingdom). Dept. of Civil and Environmental Engineering
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
684441
Resource Type:
Journal Article
Journal Name:
Corrosion
Additional Journal Information:
Journal Volume: 55; Journal Issue: 9; Other Information: PBD: Sep 1999
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CATHODIC PROTECTION; REINFORCED CONCRETE; AQUATIC ECOSYSTEMS; TIDE; CHLORIDES; DIFFUSION; CURRENT DENSITY; MATHEMATICAL MODELS

Citation Formats

Hassanein, A.M., Glass, G.K., and Buenfeld, N.R. Chloride removal by intermittent cathodic protection applied to reinforced concrete in the tidal zone. United States: N. p., 1999. Web. doi:10.5006/1.3284040.
Hassanein, A.M., Glass, G.K., & Buenfeld, N.R. Chloride removal by intermittent cathodic protection applied to reinforced concrete in the tidal zone. United States. doi:10.5006/1.3284040.
Hassanein, A.M., Glass, G.K., and Buenfeld, N.R. Wed . "Chloride removal by intermittent cathodic protection applied to reinforced concrete in the tidal zone". United States. doi:10.5006/1.3284040.
@article{osti_684441,
title = {Chloride removal by intermittent cathodic protection applied to reinforced concrete in the tidal zone},
author = {Hassanein, A.M. and Glass, G.K. and Buenfeld, N.R.},
abstractNote = {A basis for protecting steel in concrete using intermittent cathodic protection (CP) is provided by the removal of chloride ions from the surface of the steel. The present study reported on parallel, experimental, and theoretical investigations undertaken to study chloride removal effects induced by an intermittent CP current in a tidal zone situation. Factors that affected the short-term chloride removal efficiency included the resistivity of concrete, charge passed, treatment duration, initial chloride content, concrete cover, and chloride diffusion coefficient. Very high extraction efficiencies initially were observed sometimes, possibly as the result of pressure-induced flow of the pore solution resulting from the generation of gas at the cathode. Chloride removal appeared to be limited by the rate of release of bound chloride within the period of treatment if a high charge was applied in a limited period of time. However, in the long term, the chloride profile reached a steady state governed only by the concentration gradients and the average applied electric field determined by the charge passed in a given time and the resistivity. This may be used to select the steady-state design current density.},
doi = {10.5006/1.3284040},
journal = {Corrosion},
number = 9,
volume = 55,
place = {United States},
year = {1999},
month = {9}
}