Analysis of half-cell potential measurement for corrosion of reinforced concrete

Leelalerkiet, Veerachai; Kyung, Je Woon; Ohtsu, Masayasu; Yokota, Masaru

doi:10.1016/j.conbuildmat.2003.10.004

Cited by 78 publications

(35 citation statements)

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“…It is worth to highlight that data of corrosion potential for Stage 3 (age between 425 and 450 days) were not used in this evaluation, because the ages of the samples are very different between themselves and could compromise the comparison of data. It is possible to observe that the corrosion potential is more negative for greater moisture contents, as also evidenced by Elsener et al [7] and Leelalerkiet et al [33]; in other words, corrosion potentials at 70 days measured in the test specimens that were in humid environment (saturated) are more negative than corrosion potentials at 98 days (drying in laboratory environment between 71 and 98 days), when the test specimens had a smaller moisture content. The interaction between moisture content and corrosion potential is significant and this fact was evidenced by means of variance analysis ANOVA (Table 4), where the value of F calculated is higher than the F critical tabulated for 95% of significance.…”

Section: Influence Of Moisture Contentmentioning

confidence: 63%

Corrosion potential: influence of moisture, water-cement ratio, chloride content and concrete cover

Medeiros

Rocha

Medeiros-Junior

et al. 2017

Rev. IBRACON Estrut. Mater.

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ResumoThe corrosion potential technique is used as an electrochemical method to support the monitoring of reinforcement corrosion in reinforced concrete structures. The corrosion potential ranges and its correlation with corrosion's likelihood (recommended by ASTM C 876:2015) are usually employed as an evaluation criterion of the results. The thermodynamic state of corrosion in the structure or specimen (laboratory) can be established if these criteria are well used. However, the method is infl uenced by numerous factors related to the concrete, environment and the procedures adopted at the time of the test. In order to provide useful information to technical and scientifi c community for the correct use of this type of non-destructive evaluation technique, the aim of this article is to evaluate some of the possible factors of infl uence on the corrosion potential measures, such as concrete moisture content, water-cement ratio, thickness of the concrete cover and degree of chloride contamination. The results indicate that moisture and the degree of chloride contamination tend to make more electronegative corrosion potential. Furthermore, the infl uence of concrete cover is diff erent for concrete contaminated (1% of chloride by weigh of cement) and not contaminated by chlorides: the infl uence of the cover thickness in the concrete contaminated with chlorides was reverse because the greater the cover thickness, the least electronegative corrosion potential value; on the other hand, in the concrete without contamination by chlorides, the eff ect of the cover thickness in corrosion potential readings was irrelevant. All these statements were proven with 95% statistical signifi cance.Keywords: corrosion potential, concrete moisture content, water-cement ratio, chloride, concrete cover.O método de medida de potencial de corrosão é utilizado como uma ferramenta eletroquímica de auxílio ao monitoramento da corrosão das armaduras de estruturas de concreto armado. Como critério de avaliação dos resultados, é comum que sejam adotados os intervalos de potencial de corrosão e sua correlação com a probabilidade de corrosão, preconizadas pela ASTM C 876:2015. Com este critério é possível estabelecer um panorama da situação termodinâmica de corrosão na estrutura ou no corpo de prova em laboratório. Porém, o método é infl uenciado por inúmeros fatores relacionados ao concreto, ao ambiente e aos procedimentos adotados no momento da realização das leituras. Visando fornecer informações para orientar o meio técnico e científi co ao uso correto deste tipo de método de avaliação não destrutiva, o objetivo deste trabalho é avaliar alguns dos possíveis fatores de infl uência nas medidas de potencial de corrosão, tais como: teor de umidade do concreto, relação água/cimento, espessura do cobrimento das armaduras e grau de contaminação por cloretos. Os resultados indicaram que a umidade e o grau de contaminação do concreto por íons cloretos tenderam a tornar o potencial de corrosão mais eletronegativo. Além disso, foi verifi c...

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Section: Influence Of Moisture Contentmentioning

confidence: 63%

Corrosion potential: influence of moisture, water-cement ratio, chloride content and concrete cover

Medeiros

Rocha

Medeiros-Junior

et al. 2017

Rev. IBRACON Estrut. Mater.

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“…The factors affecting these techniques and measures to develop effective methodology in improving strength parameters using synthetic simulation approach has been proposed. Veerachai Leelalerkiet et al [13] has used Half-Cell Potential apparatus to determine the probability of rusting of steel in reinforced concrete slabs subjected to cyclic wet and dry conditions. 3D Boundary Element Method is used to study the parameters like, the rate of flow of current and the potential distributions.…”

Section: Literature Reviewmentioning

confidence: 99%

Condition Assessment of Existing Concrete Building Using Non-Destructive Testing Methods for Effective Repair and Restoration-A Case Study

Venkatesh

Alapati

2017

CivileJournal

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Buildings constructed during early 70's & late 80's of the last century in India are found to be in distressed conditions due to inadequate specifications and poor construction practices. The continuous monitoring of concrete structures using suitable NDT (Non Destructive Testing) methods and use of possible restoration methods help in a considerable reduction of the rate of deterioration of concrete structures thereby increasing the life span of structures. NDT methods have greater advantage in evaluating the uniformity, homogeneity, approximate compressive strength, durability, the extent of corrosion of rebars in concrete etc. of damaged structures. The objective of the present study is to enhance the life of 50 year old existing hospital building (Partly RC and Brick masonry) in Kurnool, Andhra Pradesh. Condition assessments are carried out through a visual, field and laboratory evaluation of samples collected from the structure and results are presented in this paper. The paper also highlights the assessment of strength and durability of concrete to evaluate the extent of distress and damage in the building. Besides visual inspection, the Non Destructive Evaluation covering UPV & Rebound Hammer values and Half Cell Potential with respect to the status of corrosion of reinforcing bars and chemical tests on selected undistressed RC columns, beams, and slabs are also presented and discussed. The repair and strengthening techniques using the latest materials and possible restoration works such as column jacketing, shotcreting, anticorrosive coatings, etc. have been suggested to enhance the life of the structure.

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“…For example, the half-cell potential meter can be used to infer the probability of corrosion of the steel rebar from the surface of the concrete [11,12] by measuring the electrochemical potential between the rebars and a reference 'half-cell' electrode at the surface. Areas of high potential gradient are more likely to be undergoing corrosion.…”

Section: Introductionmentioning

confidence: 99%

Non-destructive evaluation of concrete using a capacitive imaging technique: Preliminary modelling and experiments

Yin

Hutchins

Diamond

et al. 2010

Cement and Concrete Research

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This paper describes the application of capacitive imaging to the inspection of concrete. A two-dimensional finite-element method is employed to model the electric field distribution from capacitive imaging probe, and how it interacts with concrete samples. The results indicate that the capacitive imaging technique could be used to detect micro-cracks on the surface of concrete samples, as well as sub-surface air voids and steel reinforcement bars.

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Analysis of half-cell potential measurement for corrosion of reinforced concrete

Cited by 78 publications

References 2 publications

Corrosion potential: influence of moisture, water-cement ratio, chloride content and concrete cover

Corrosion potential: influence of moisture, water-cement ratio, chloride content and concrete cover

Condition Assessment of Existing Concrete Building Using Non-Destructive Testing Methods for Effective Repair and Restoration-A Case Study

Non-destructive evaluation of concrete using a capacitive imaging technique: Preliminary modelling and experiments

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