Macrocell corrosion of steel in concrete – experiments and numerical modelling

Jäggi, S.; Böhni, H.

doi:10.1533/9781845692285.75

Cited by 13 publications

(9 citation statements)

References 13 publications

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“…The most common techniques used for R p measurements, to assess the i corr of steel in RCS, were galvanostatic [3,5,70,[146][147][148][149], potentiostatic pulses [17,136,150,151], cyclic voltammetry (conducted at very low scan rates) [151][152][153][154][155][156][157][158][159], and electrochemical impedance spectroscopy (EIS) [81,[160][161][162][163][164][165][166]. The method proposed by Stern and Geary in 1957 is based on the observation of the linearity of the polarization curve together with the corrosion potential.…”

Section: Concrete Resistivity (ρ)mentioning

confidence: 99%

Electrochemical Sensors for Monitoring the Corrosion Conditions of Reinforced Concrete Structures: A Review

Figueira¹

2017

Applied Sciences

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Several methods for corrosion monitoring of reinforced concrete structures (RCS) have been proposed in the last few decades. These systems may be used either in new, existing or repaired structures. The corrosion monitoring can be performed by different methodologies. These may or may not be destructive, use different degrees of complexity and cost, and provide information on the progression and kinetics of the corrosion phenomena. The destructive methods are limited to sampling. Therefore, these may not be representative of the whole structure, which is extremely important in RCS with large heterogeneities both in terms of materials used and in terms of the exposure environment. Within this context, non-destructive methods have been widely developed, which are intended to provide quick information about the entire structure. Ideally, these systems should be able to detect the corrosion state of the steel inside the concrete, the main causes of corrosion and the evolution of corrosion phenomena over time. This manuscript reviews and summarizes the actual state of the art and the main achievements in the field of electrochemical sensors based on non-destructive methods for corrosion monitoring of RCS in the last few years. The challenges and perspectives in this field will also be discussed.

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Section: Concrete Resistivity (ρ)mentioning

confidence: 99%

Electrochemical Sensors for Monitoring the Corrosion Conditions of Reinforced Concrete Structures: A Review

Figueira¹

2017

Applied Sciences

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“…Electrochemical Cell Current (ECC) versus CSE that was measured through Zero Resistance Ammeter (ZRA), Model ZM3P obtained from Corrosion Service ® (McCarter and Vennesland, 2004;Jaggi et al, 2001).…”

Section: Setup Of Electrochemical Monitoring Experimentmentioning

confidence: 99%

Evaluation and Analyses of Rhizophora mangle L. Leaf-Extract Corrosion-Mechanism on Reinforcing Steel in Concrete Immersed in Industrial/Microbial Simulating-Environment

Okeniyi¹,

Loto²,

Popoola³

2015

J. of Applied Sciences

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Rhizophora mangle L. leaf-extract admixed steel-reinforced concretes for detailing mechanism of the extract on steel-rebar corrosion in 0.5 M H 2 SO 4 (simulating industrial/microbial environment). These electrochemical test-measurements, including corrosion potential, corrosion current and corrosion rate, were subjected to the analyses of probability distributions as per ASTM G16-95 R05 through the Kolmogorov-Smirnov goodness-of-fit test-statistics. Results showed that corrosion rate exhibited correlations with function of the natural plant-extract concentration and compact series of the inverse electrochemical noise resistance; the ratio of standard deviations of corrosion potential and corrosion current. Both the experimental and the correlated-prediction model identified Rhizophora mangle L. leaf-extract admixture concentrations that exhibited inhibition efficiency performance of η>70% on steel-rebar corrosion in the acidic test-medium. The adsorption isotherm modelling of the experimental and the predicted electrochemical test-results exhibited good agreements by following the Langmuir and Flory-Huggins isotherm fittings. In addition, the study identified physisorption as the prevalent corrosion-protection mechanism of the steel-rebar by the plant extract through both of the experimental and the correlated-prediction models of adsorption isotherm analyses.

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“…(i) Half-cell potential (HCP) measurements were measured through the experimental period versus Cu/CuSO 4 electrode (CSE), Model 8-A (Tinker & Rasor R ) using a high impedance digital multimeter, Model DT-9205A, figure 1a, according to ASTM C876-91 R99 (2005). (ii) Electrochemical cell current (ECC) measurements: in the concrete-test solution system were measured, versus the CSE, using zero resistance ammeter, (ZRA), Model ZM3P (Corrosion Service) (Jäggi et al 2001;McCarter & Vennesland 2004;Abdelaziz et al 2009;Sastri 2011). This constitutes the Daniel cell model (Broomfield 2003) of measuring reinforcing steel dissolution activity (McCarter & Vennesland 2004) in the aggressive test solution systems which shares porous partitioning with the Cu/CuSO 4 .…”

Section: 2b Setup For Corrosion Test Data Measurementsmentioning

confidence: 99%

Probability density fittings of corrosion test-data: Implications on C6H15NO3 effectiveness on concrete steel-rebar corrosion

Okeniyi

Ambrose

Okpala

et al. 2014

Sadhana

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In this study, corrosion test-data of steel-rebar in concrete were subjected to the fittings of the Normal, Gumbel and the Weibull probability distribution functions. This was done to investigate the suitability of the results of the fitted test-data, by these distributions, for modelling the effectiveness of C 6 H 15 NO 3 , triethanolamine (TEA), admixtures on the corrosion of steel-rebar in concrete in NaCl and in H 2 SO 4 test-media. For this, six different concentrations of TEA were admixed in replicates of steel-reinforced concrete samples which were immersed in the saline/marine and the microbial/industrial simulating test-environments for seventy-five days. From these, distribution fittings of the non-destructive electrochemical measurements were subjected to the Kolmogorov-Smirnov goodness-of-fit statistics and to the analyses of variance modelling for studying test-data compatibility to the fittings and testing significance. Although all fittings of test-data followed similar trends of significant testing, the fittings of the corrosion rate test data followed the Weibull more than the Normal and the Gumbel distribution fittings, thus supporting use of the Weibull fittings for modelling effectiveness. The effectiveness models on rebar corrosion, based on these, identified 0.083% TEA with optimal inhibition efficiency, η = 72.17± 10.68%, in NaCl medium while 0.667% TEA was the only admixture with positive * For correspondence Joshua Olusegun Okeniyi et al effectiveness, η = 56.45±15.85%, in H 2 SO 4 medium. These results bear implications on the concentrations of TEA for effective corrosion protection of concrete steel-rebar in saline/marine and in industrial/microbial environments.

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Macrocell corrosion of steel in concrete – experiments and numerical modelling

Cited by 13 publications

References 13 publications

Electrochemical Sensors for Monitoring the Corrosion Conditions of Reinforced Concrete Structures: A Review

Electrochemical Sensors for Monitoring the Corrosion Conditions of Reinforced Concrete Structures: A Review

Evaluation and Analyses of Rhizophora mangle L. Leaf-Extract Corrosion-Mechanism on Reinforcing Steel in Concrete Immersed in Industrial/Microbial Simulating-Environment

Probability density fittings of corrosion test-data: Implications on C6H15NO3 effectiveness on concrete steel-rebar corrosion

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