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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Effect of Electrical Field on the Removal of Chloride Ions From Concrete Slabs
Author(s): L. Tang, L. Berntsson, J. Aavik, and L. O. Nilsson
Publication: Special Publication
Appears on pages(s): 597-608
Keywords: chloride ions; concretes; concrete slabs; cores; diffusion; electrical properties; Materials Research
Abstract:In this study, 2 x 2 x 2-m reinforced concrete slabs with an overlay containing initial chloride contents of 0.2, 0.7, and 0.2 percent Cl were electrochemically treated. An electrical field at current densities of 0.7, 1.0, and 1.3 A/m 2 was applied across the overlay at biweekly intervals for a total duration of 8 weeks. During each intermission, the cores were taken from the slabs to determine chloride distribution profiles. Chloride diffusivities in concrete before and after electrochemical treatment were also determined by using a rapid method. The effects of an electrical field on chloride distribution profiles and chloride diffusivity in concrete are discussed. Results show that the electrochemical treatment has no apparent influence on chloride diffusivity, and that this treatment has a limit beyond which the further removal of chloride ions becomes difficult. It is difficult to remove chloride ions homogeneously from concrete using the reinforcement as a cathode.
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