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|Title: ||Investigating the effect of Interrupted Cathodic Protection on reinforced concrete structures|
|Authors: ||Christodoulou, Christian|
Glass, Gareth K.
Austin, Simon A.
Goodier, Chris I.
|Issue Date: ||2010|
|Publisher: ||The European Corrosion Congress|
|Citation: ||CHRISTODOULOU, C. ... et al, 2010. Investigating the effect of Interrupted Cathodic Protection on reinforced concrete structures. Presented at EUROCORR 2010, 13 - 17 September 2010, Moscow, Russia.|
|Abstract: ||Impressed Current Cathodic Protection (ICCP) has been one of the major
components of the repair and maintenance strategy on many motorway structures in
the U.K. It has helped to prolong the life of more than 700 structures, in a significantly
sustainable manner, by reducing the need to remove chloride contaminated (but
otherwise sound) concrete. This study was initiated after identifying that some of the
ICCP systems were reaching the end of their design life and required a significant
level of maintenance (including anode replacement) to operate in accordance with
the latest Codes of Practice. In addition, there were a number of structures where the
application of ICCP has been interrupted due to severe anode deterioration or
The objective of this work was to collate evidence from structures to support
preliminary laboratory results that the application of ICCP to a reinforced concrete
structure over a period of time can transform the environment around the
reinforcement, even after the protective current has been interrupted.
This experimental field study interrupted the current to ten structures which had been
protected with ICCP between 5 and 16 years and corrosion rates were monitored to
determine when reinforcement corrosion will initiate again.
It was found that after five or more years of ICCP, the steel remained passive for at
least 30 months after interrupting the protective current, despite the presence of
chloride contamination representing a substantial corrosion risk. In some cases,
severe anode deterioration meant that the current was interrupted at an unknown
point in time prior to the initiation of the scheme.
Four main conclusions are drawn regarding this approach: it can give an indication of
when repairs to ICCP systems are likely to be critical; provide new evidence for the
design lives attributed to systems using lower cost anodes; reduce the requirement to
replace systems at the end of their functional lives; and potentially extend the interval between planned maintenance of existing systems with corresponding reduction in
monitoring frequency, cost and disruption.|
|Description: ||This is a conference paper.|
|Version: ||Accepted for publication|
|Appears in Collections:||Conference Papers (Civil and Building Engineering)|
Conference Papers (CICE)
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