Modeling cathodic prevention for unconventional concrete in salt‐laden environment

Yajun Liu (Corrosion and Sustainable Infrastructure Laboratory, Western Transportation Institute, College of Engineering, Montana State University, Bozeman, Montana, USA)
Xianming Shi (Corrosion and Sustainable Infrastructure Laboratory, Western Transportation Institute, College of Engineering, Montana State University, Bozeman, Montana, USA)

Anti-Corrosion Methods and Materials

ISSN: 0003-5599

Publication date: 19 May 2012

Abstract

Purpose

The purpose of this paper is to provide a modeling perspective relevant to the use of cathodic prevention (CPre) for unconventional concrete in salt‐laden environment.

Design/methodology/approach

Based on the experimentally obtained concrete resistivity and chloride diffusion coefficient data, numerical studies with the Nernst‐Planck equations were conducted to investigate the influence of applied voltage (magnitude, direction, and interruption), surface chloride concentration, and concrete mix design on the effectiveness of cathodic prevention and the distribution of ionic species in protected concrete.

Findings

The modeling results revealed that the direction of applied electric voltage has significant effect on the distributions of electrical potential and hydroxyl ions in the reinforced concrete, confirming the benefits of cathodic prevention in significantly increasing hydroxyl concentration near rebar and in slowing down the ingress of chloride ingress into concrete. The performance of intermittent CPre was found to be constrained by the variations in concrete resistance from the anode to the cathode. The model was also useful in illustrating the temporal and spatial evolutions on rebar surface in terms of oxygen, hydroxyl and chloride concentrations and electrical potential of top rebar, as well as such evolutions in concrete domain in terms of concrete resistivity and current density for each mix design.

Originality/value

The results reported herein shed light on the fundamental processes defining the performance of CPre for new unconventional concrete in salt‐laden environment.

Keywords

Citation

Liu, Y. and Shi, X. (2012), "Modeling cathodic prevention for unconventional concrete in salt‐laden environment", Anti-Corrosion Methods and Materials, Vol. 59 No. 3, pp. 121-131. https://doi.org/10.1108/00035591211224663

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Publisher

:

Emerald Group Publishing Limited

Copyright © 2012, Emerald Group Publishing Limited

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