Influence of Electrochemical and Physical Characteristics of Reinforced Concrete on the Design of Cathodic Protection

Ahmed, Hisham K.; Hamed, Hisham H.; Uelawy, Haider M.

doi:10.30684/etj.29.6.13

	Influence of Electrochemical and Physical Characteristics of Reinforced Concrete on the Design of Cathodic Protection
Engineering and Technology Journal
Article 1, Volume 26, Issue 6, 2008, Pages 273-285 PDF (269.11 K)
DOI: 10.30684/etj.29.6.13
Authors
Hisham K. Ahmed; Hisham H. Hamed; Haider M. Uelawy
Abstract
The design aspect of cathodic protection of steel reinforcement embedded in concrete; still implies a great deal of uncertainties, assumptions and specifications. Important features, such as design criteria, current distribution, and others are, as yet beyond standardization. The main aim of this research is to study relationship between the induced level of polarization and the area of the embedded steel, area of anode, the distance between the cathode and anode and the level of applied external voltage. The experimental program included preparing 12 reinforced concrete specimens with dimensions 20 x 30 x 60 cm. The specimens were partially submerged in 3.5% sodium chloride solution. Various electrochemical and electrical measurement were carried out on polarized the specimen using different external voltages. The results indicate differential moisture content within each specimen has produced different potentials along the steel bars. Greater polarization has always been associated with the submerged portion of the specimen. The results show that to achieve efficient design, the protected area should be divided into discrete electrochemical zones depending on the concrete resistance and steel potential.

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