Investigation of the residual protection of steel following application of protective current

Bhuiyan, Shamir; Law, David W.; Nicholls, Peter K.; Christodoulou, Christian

doi:10.1016/j.conbuildmat.2017.12.049

Cited by 7 publications

(6 citation statements)

References 18 publications

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“…The decrease in potential associated with the tidal cycles is generally of the order of 50 mV, though on occasion this does increase significantly, with potentials more negative than -800 mV being observed in the electrodes in the tidal zone. These falls in potential are consistent with those observed in previous studies and are attributed to the saturation of the concrete resulting in oxygen depletion resulting in the very negative potentials observed rather than the re-establishment of corrosion [17].…”

Section: Resultssupporting

confidence: 91%

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Residual protection on a wharf structure following application of impressed current cathodic protection

2019

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Recent studies have suggested that residual protection is afforded to structures following the application of impressed current cathodic protection (ICCP), in some cases for significant periods of time, while others for periods of only a few days. This study reported the findings of the de-activation of a 20 year old ICCP system installed on a 50 year old structure. The ICCP was de-activated for 84 days and the steel potentials at locations on the front pile cap and front wall were monitored via the installed reference electrodes. An adjacent water anode system was also de-activated for 48 hours during the initial de-activation period to observe the impact on the steel potentials. The results showed that out of 42 reference electrodes, 17 achieved a 100 mv decay within 24 hours and 10 had more positive instant off potentials than -150 mV. Furthermore, all displayed a positive shift in potential following deactivation of the ICCP system for a period of time, indicative of residual protection, with 22 displaying this positive shift for the whole 94 days of the trial.

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Section: Resultssupporting

confidence: 91%

“…The shape of the potential decay versus time plot can also be used to provide an indication of the corrosion activity occurring on the reinforcing steel following deactivation of the ICCP system [17]. Re-activation of corrosion in the steel is characterised by a potential shift to more negative values.…”

Section: Discussionmentioning

confidence: 99%

Residual protection on a wharf structure following application of impressed current cathodic protection

2019

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“…In terms of durability investigation, the accelerated tests are commonly used in research investigating the efficiency of the cathodic protection technique, which mainly focuses on the corrosion of rebar (Cramer et al, 2002;García et al, 2012;Anwar et al, 2014;Lu et al, 2018;Bhuiyan et al, 2018). If the relation between an accelerated test and a normal operation condition can be identified, the results from an accelerated test can be easily converted to any specific current density level.…”

Section: Discussion On Durabilitymentioning

confidence: 99%

Combined Impressed Current Cathodic Protection and FRCM Strengthening for Corrosion-Prone Concrete Structures

Wei

Zhu

et al. 2019

J. Compos. Constr.

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：This study introduces the use of the combined impressed current cathodic protectionstructural strengthening (ICCP-SS) as a technique for repairing reinforced concrete (RC) structures that have been subjected to chloride-induced corrosion. The development of this technique is based on the combination of a carbon fiber mesh (CF-MESH) and a polymer-modified cementitious matrix to produce a carbon fiber reinforced cementitious matrix (C-FRCM). Firstly, the effects of different types and amounts of high molecular weight polymer and short chopped carbon fibers on the flexural and compressive strength, conductivity and shear strength of a matrix with concrete substrate were investigated in order to find the optimum ingredients required for a high-performance cementitious matrix. Secondly, a shaped CF-MESH was bonded onto the surface of a concrete cube using the aforementioned optimized cementitious matrix. The impressed current cathodic protection (ICCP) technique was then applied to the specimens by using different current densities with the CF-MESH as the anode. During the Mei-ni SU 1 , Liangliang WEI 2 , Ji-Hua ZHU 3* , Tamon UEDA 4 , Guan-ping GUO 5 , Feng XING, "Combined Impressed Current Cathodic Protection and FRCM Strengthening for Corrosion-Prone Concrete Structures", Journal of composites for construction, ASCE, 23(4):04019021. protection period, the protection conditions of rebars subjected to ICCP were assessed by analyzing a variety of electrochemical parameters. Thirdly, single shear tests were conducted; the shear strengths and failure modes of the specimens were obtained and compared in order to evaluate the effects of the ICCP on shear stress transfer. The results show that the proposed technique based on the newly proposed C-FRCM composite is able to provide effective cathodic protection as well as shear stress transfer behavior to RC structures subjected to chloride-induced corrosion, leading to an improvement with respect to structural durability.

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“…However, supposing that corrosion has not already re-activated, a new system could be designed less conservatively, for example with a lower current demand. Some information exists on residual protection after stopping the current flow [25], where positive effects were documented after short term CP operation. This deserves attention from both research and CP engineering communities.…”

Section: Market and Recent Developmentsmentioning

confidence: 99%

Cathodic protection of reinforcement in concrete – experience and development over 30 years

Polder

Peelen²

2019

MATEC Web Conf.

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This paper presents developments over 30 years in the field of cathodic protection of steel reinforcement in concrete in The Netherlands and elsewhere. From the late 1980s major developments have been: application to large numbers of precast elements corroding due to mixed-in chloride with drilled in titanium anodes and conductive coatings; analysis of working life of systems and components and end-of-life considerations; application to prestressed structures; new anode types including galvanic systems with associated life and design considerations; numerical modelling and preventative applications. Presently, CP has become a fully accepted method of securing safety and serviceability of buildings and infrastructure. Major successes and lessons learned will be presented. Technical and non-technical developments are highlighted and some recent innovative CP systems are discussed.

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Investigation of the residual protection of steel following application of protective current

Cited by 7 publications

References 18 publications

Residual protection on a wharf structure following application of impressed current cathodic protection

Residual protection on a wharf structure following application of impressed current cathodic protection

Combined Impressed Current Cathodic Protection and FRCM Strengthening for Corrosion-Prone Concrete Structures

Cathodic protection of reinforcement in concrete – experience and development over 30 years

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