Discussion: Hybrid anode concrete corrosion protection – independent study

Dodds, Wayne J.; Christodoulou, Christian; Goodier, Chris I.; Atkins, Chris; Preston, J. F.

doi:10.1680/jcoma.17.00026

Cited by 5 publications

(6 citation statements)

References 10 publications

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“…There is still much debate in industry regarding the adoption of hybrid anodes as an effective corrosion management technique. The collection and publication of long-term performance data of hybrid anodes aims to generate further discussion and interest in the subject domain to overcome existing concerns [17]. The data analysed in this study indicates that the design approach of an initial impressed current phase (50kC/m² of steel surface area), followed by an ongoing galvanic phase for the remainder of the anodes design life, has been effective at preventing the reactivation of reinforcement corrosion for up to 8 years.…”

Section: Discussionmentioning

confidence: 93%

Long-Term Performance of Hybrid Anodes for Cathodic Protection of Reinforced Concrete

Dodds¹,

Christodoulou²,

Goodier

2018

MATEC Web Conf.

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The long-term performance of hybrid anode corrosion protection systems (UK invention disclosed in Patent GB2426008B) was investigated on six bridge structures as part of a holistic approach to corrosion risk management, using the performance criteria in ISO BS EN 12696:2016. The aim of the study was to review the effectiveness of current design approaches to meet the residual service life when the anodes are operating in the galvanic phase. This was achieved by analysing data on the general condition of the structures, the ongoing performance of the installed hybrid anodes, and assessing the subsequent corrosion risk. It was found that the six structures were generally in good condition, 1 to 8 years after refurbishment works, with low associated corrosion risk in areas protected by the hybrid anode systems. This is a positive finding for the wider implementation of hybrid anode systems as an alternative corrosion management technique. The reinforcement in the protected areas remained predominately in a passive condition, with calculated corrosion rates below the ISO 12696:2016 recommended threshold of 2mA/m2.

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Section: Discussionmentioning

confidence: 93%

Long-Term Performance of Hybrid Anodes for Cathodic Protection of Reinforced Concrete

Dodds¹,

Christodoulou²,

Goodier

2018

MATEC Web Conf.

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“…The constants in the above equations are the anodic and cathodic Tafel constants and the limiting current. Concerns have been raised as to their effect on the calculated corrosion rate . To assess the sensitivity to changes in these constants, the calculated corrosion rate is plotted as a function of each constant in Figure .…”

Section: Background Theorymentioning

confidence: 99%

“…Examples include the assessment of applications of sacrificial and hybrid corrosion protection systems and the assessment of an interrupted impressed current cathodic protection trial . However, the use of alternative assessment criteria to those specifically listed in the standard (albeit in a non exhaustive list) has been the source of some debate . This work considers the theoretical and empirical basis for acceptance criteria applicable to both impressed current and sacrificial cathodic protection systems in above ground reinforced concrete that are allowed in current standard practice.…”

Section: Introductionmentioning

confidence: 99%

Assessment of cathodic protection applied to above ground reinforced concrete

Glass¹,

Roberts²,

Davison³

2018

Materials & Corrosion

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Standard practice allows the use of developing expertise in the assessment of cathodic protection of steel in concrete. This work sets out a theoretical and empirical basis for such an assessment. Assessment may be based on the observation that, at protection current densities typically used in reinforced concrete, the degree of polarization provides an indication of steel corrosion risk. An example is, a steel polarization of 55 mV or more achieved by a protection current of 5 mA m−2 or less is indicative of passive steel reinforcement. Such risk assessment criteria are supported by both theory and practice. Polarization is generally a consequence, not a cause, of steel passivity in concrete. The removal of chloride from, or the generation of hydroxide at the steel surface dominate the restoration of steel passivity. Flexibility over the degree of polarization required in cathodic protection systems may be used to address adverse effects associated with the delivery of protection current.

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“…The final feature is a discussion on a paper titled 'hybrid anode concrete corrosion protection -independent study' written by Dodds et al (2017). The discussion comprises contributions from two contributors and the responses from the authors.…”

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confidence: 99%

Editorial

Williams

2017

Proceedings of the Institution of Civil Engineers - Constructio

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Discussion: Hybrid anode concrete corrosion protection – independent study

Cited by 5 publications

References 10 publications

Long-Term Performance of Hybrid Anodes for Cathodic Protection of Reinforced Concrete

Long-Term Performance of Hybrid Anodes for Cathodic Protection of Reinforced Concrete

Assessment of cathodic protection applied to above ground reinforced concrete

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