Cathodic Protection of Reinforcing Steel in Concrete Using Conductive-Polymer System
Publication: Journal of Materials in Civil Engineering
Volume 16, Issue 4
Abstract
This paper presents experimental results from a novel study to investigate the feasibility of using a dual sacrificial anode cathodic protection (SACP) system that combined corrosion protection with strengthening. A conductive polymer was used to bond the zinc plates to the concrete surface to form the SACP system, while a single unidirectional carbon fiber-reinforced polymer (CFRP) sheet was bonded to the zinc surface to provide strengthening. However, the aim was not to evaluate strengthening, but to determine if the CFRP interfered with the performance of the SACP system. Four concrete prisms, two of which were strengthened, were tested. The specimens were all placed in a high humidity environment, and their potential and galvanic current measurements were carried out over the entire 295-day exposure period. It was found that the SACP system performed adequately, although there was an apparent decrease in the protective current due to passivation of the zinc plate. Although the potential results from both SACP systems studied (bare Zn plate versus Zn+CFRP ply) were different, the current delivery was similar, indicating little interference between the Zn plate and the carbon fiber ply attached on top of this plate.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 16 • Issue 4 • August 2004
Pages: 315 - 321
Copyright
Copyright © 2004 American Society of Civil Engineers.
History
Received: Jan 30, 2002
Accepted: Sep 23, 2003
Published online: Jul 15, 2004
Published in print: Aug 2004
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