A critical examination of corrosion rate measurement techniques applied to reinforcing steel in concrete

Fahim, Andrew; Ghods, Pouria; Isgor, O. Burkan

doi:10.1002/maco.201810263

Cited by 35 publications

(19 citation statements)

References 41 publications

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“…i corr is the CCD, μAÁcm −2 . B is Stern-Geary constant ranged from 13 to 52 mV [36][37][38] ; B value of 26 mV is suitable for the corroded rebar, whereas B value of 52 mV is used for uncorroded rebar, 39 and the criteria for evaluating the corrosion degree of rebar was given in Reference 31.…”

Section: Experimental Principlementioning

confidence: 99%

Time‐dependent model and life prediction for reinforcement corrosion in magnesium oxychloride cement concrete

Gong

Wang

Zhang

et al. 2020

Structural Concrete

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An effective approach to make better use of the salt-brine resistance of magnesium oxychloride cement concrete (MOCC) and reduce "magnesium damage" (the concentrate of magnesium resources) that destroys the ecological balance in salt lake areas is to apply MOCC widely. However, the first problem is the high chloride ion content in MOCC, which corrodes reinforcement easily. Concrete cover depth, the experimental environment, and surface treatment of rebar were considered factors study in reinforcement corrosion in MOCC. Based on the tests conducted, a time-dependent model for reinforcement corrosion in MOCC was proposed, and its life time (initial corrosion and initial cracking time) was calculated and verified in tests. The results showed that proper coating could inhibit reinforcement corrosion and increase the service life of rebar significantly. Further, the salt lake environment had little influence on reinforcement corrosion in MOCC. For exposed rebar in MOCC, the larger the concrete cover depth, the more serious the reinforcement corrosion, while, for coated rebar, the converse was true. All cases of reinforcement corrosion in MOCC conformed to the logarithmic-type time-dependent model before concrete cracking. Accordingly, reinforcement corrosion in MOCC and the excess of magnesium resources are expected to be solved.

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Section: Experimental Principlementioning

confidence: 99%

Time‐dependent model and life prediction for reinforcement corrosion in magnesium oxychloride cement concrete

Gong

Wang

Zhang

et al. 2020

Structural Concrete

View full text Add to dashboard Cite

show abstract

“…It has been reported that in appraisal of the state of passivity of reinforcement, a more accurate estimate of passive corrosion rates can be achieved by using slower scan rates . Therefore, conforming to ASTM G5, the LPR test was carried out at a fixed scan rate of 0.166 m V −1 s −1 .…”

Section: Experimental Programmentioning

confidence: 99%

“…This method uses a low‐range potential similar to that used in linear polarization resistance test, so electrochemical impedance spectroscopy is considered as a non‐destructive method. The cycles of potentials used in this method vary from anodic to cathodic values and unlike the methods described above, are produced from alternating current instead of direct current . Using a low potential range in this test, results in minimum disturbance in the electrochemical system that reduces the errors caused by the measurement.…”

Section: Experimental Programmentioning

confidence: 99%

Investigation of passive layer formation on steel rebars in foamed concrete

Bagheri

Rastegar

2019

Materials & Corrosion

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Foamed concrete is a versatile lightweight material which is increasingly being considered for structural and semi structural applications. This would inevitably involve incorporation of steel reinforcement inside foamed concrete. The presence of large volume of air voids in the vicinity of steel could unfavorably affect its electrochemical behavior and jeopardize the formation of the passive layer. In the current study the passive layer formation of steel embedded in foam concrete with 55% air content was investigated and compared to that of steel embedded in the same mix without foam incorporation, that is, the base mix. The electrochemical tests included half-cell potential, linear polarization resistance (LPR), potentiodynamic test, and electrochemical impedance spectroscopy (EIS). The results of half-cell potential and the LPR test show that a passive layer forms within 3 weeks of casting steel inside foamed concrete which is similar to that observed for the steel in the base mix. The results of the potentiodynamic and the EIS tests which were carried out at the age of 28 days confirmed the passivity of reinforcement embedded in both foamed concrete and the base mix K E Y W O R D S corrosion, electrochemical methods, foamed concrete, passive layer

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“…Various electrochemical methods (potential mapping, galvanostatic pulse, electrochemical impedance spectroscopy, potentiodynamic polarization measurements) are used for the corrosion monitoring of steel in concrete [22][23][24][25][26], but their interpretation can be difficult and, in some cases, unreliable. The specific feature of corrosion in concrete is that the anodic and cathodic sites are spatially localized due to the porous structure of the concrete [5], while the porosity of the concrete also affects the transport of the electrolyte and oxygen, determining the dynamics of the corrosion processes [27].…”

Section: Introductionmentioning

confidence: 99%

Monitoring the Corrosion of Steel in Concrete Exposed to a Marine Environment

2020

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Reinforced concrete structures require continuous monitoring and maintenance to prevent corrosion of the carbon steel reinforcement. In this work, concrete columns with carbon and stainless steel reinforcements were exposed to a real marine environment. In order to monitor the corrosion processes, two types of corrosion probes were embedded in these columns at different height levels. The results from the monitoring of the probes were compared to the actual corrosion damage in the different exposure zones. Electrical resistance (ER) probes and coupled multi-electrodes (CMEs) were shown to be promising methods for long-term corrosion monitoring in concrete. Correlations between the different exposure zones and the corrosion processes of the steel in the concrete were found. Macrocell corrosion properties and the distribution of the separated anodic/cathodic places on the steel in chloride-contaminated concrete were addressed as two of the key issues for understanding the corrosion mechanisms in such environments. The specific advantages and limitations of the tested measuring techniques for long-term corrosion monitoring were also indicated. The results of the measurements and the corrosion damage evaluation clearly confirmed that the tested stainless steels (AISI 304 and AISI 304L) in a chloride-contaminated environment behave significantly better than ordinary carbon steel, with corrosion rates from 110× to 9500× lower in the most severe (tidal) exposure conditions.

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A critical examination of corrosion rate measurement techniques applied to reinforcing steel in concrete

Cited by 35 publications

References 41 publications

Time‐dependent model and life prediction for reinforcement corrosion in magnesium oxychloride cement concrete

Time‐dependent model and life prediction for reinforcement corrosion in magnesium oxychloride cement concrete

Investigation of passive layer formation on steel rebars in foamed concrete

Monitoring the Corrosion of Steel in Concrete Exposed to a Marine Environment

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