Equivalent circuit for modelling the steel-concrete interface. I. experimental evidence and theoretical predictions

Feliú, V.; González, José Antonio Varela; Andrade, C; Feliú, S.

doi:10.1016/s0010-938x(98)00036-5

Cited by 165 publications

(89 citation statements)

References 24 publications

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“…The relationship between the impedance and applied frequency can be obtained from the impedance spectra or obtained theoretically using the "equivalent electrical circuits". These circuits are composed of elements such as resistors, capacitors, and inductors 9 . The EIS is useful because its results are expressed as a function of time, so that when frequencies are applied in certain ranges, the sinusoidal wave is so rapid that it passes through the medium as if it were in a short circuit 6 .…”

Section: Experimental Programmementioning

confidence: 99%

Steel corrosion assessment by electrochemical impedance on metakaolin blended mortars

2013

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Since Corrosion of reinforcing steel in concrete is the cause of major economic losses, Portland cement has been traditionally replaced by cements blended with pozzalanic materials, most of which have been found to reduce the corrosion of steel. This paper shows the results of an experimental research aimed to investigate the corrosion of reinforcement in mortar using electrochemical impedance spectroscopy (EIS). For this, concrete laboratory samples containing a 0.0055 m steel bar and prepared with just ordinary Portland cement (OPC) and metakaolin at a replacement level of 20% were analyzed. In order to accelerate the steel corrosion process, all the samples were kept in a 3% NaCl solution and a constant anodic electrical potential was applied. Variations in the water to cementitious material ratio (0.5 and 0.6) and metakaolin proportion were analyzed, while the cementitious material to sand ratio was kept constant at 1:2.25 in all of the specimens. The results showed a reduction in corrosion rates when metakaolin was used as a blending admixture, especially at water to cementitious material ratio of 0.5.

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Section: Experimental Programmementioning

confidence: 99%

Steel corrosion assessment by electrochemical impedance on metakaolin blended mortars

2013

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“…They concluded that some improvement is obtained if CPE is used instead of an ideal capacitor. In another work, Feliu et al [65] studied a more complicated process and introduced a CPE and diffusional parameters in the equivalent circuit as shown in Fig. 7.…”

Section: Electrochemical Impedancementioning

confidence: 99%

“…Equivalent circuit with the introduction of a CPE. R e ¼ electrolyte resistance; R p ¼ charge transfer resistance; CPE ¼ constant phase element; ZD ¼ Warburg diffusion [65].…”

Section: Transient Techniquesmentioning

confidence: 99%

Chloride-induced corrosion on reinforcing steel: from the fundamentals to the monitoring techniques

Montemor¹,

Simões²,

Ferreira³

2003

Cement and Concrete Composites

430

142

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One of the most important causes for reinforcing steel corrosion is the presence of chloride ions. They cause localised breakdown of the passive film that initially forms on steel as a result of the alkaline nature of the pore solution in concrete. The harmful chloride ions can be originated from the use of contaminated mix constituents or from the surrounding environment. The determination of a critical level, above which serious problems can occur, has been one of the main goals of investigation. Unfortunately, it is difficult to establish such a value since the chloride level is influenced by several factors. Thus, after concrete contamination, it is of fundamental importance to follow the activity of chlorides and the state of the reinforcing rebars. In this respect, the use of electrochemical techniques such as polarisation resistance, electrochemical impedance, galvanostatic pulse and potential measurements have shown to be powerful tools. Nevertheless, the interpretation of the results becomes sometimes a difficult task. A large number of authors have dedicated several studies to the interpretation of such measurements and a highly dispersed number of interpretations can be found in literature. The aim of this paper is to present an overview on the state-of-the-art of the most important aspects of the corrosion process initiated by chlorides, its development and monitoring techniques.

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“…Besides it is a technique that involves long execution times. EIS technique was first employed for corrosion assessment on steels embedded in concretes by early 90's and today it is considered as great help technique to understand the behavior of steel/concrete system (Feliu et al, 1998;Bastidas et al, 2008a;Bastidas et al, 2008b).…”

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confidence: 99%

Monitoreo mediante EIS del acero embebido en un concreto de escoria activada alcalinamente expuesto a carbonatación

2011

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Monitoreo mediante EIS del acero embebido en un concreto de escoria activada alcalinamente expuesto a carbonatación * Universidad Militar Nueva Granada, Bogotá. COLOMBIA ** Universidad Pedagógica y Tecnológica de Colombia, Tunja-Boyacá. COLOMBIA Resumen En este trabajo se utilizó la técnica de espectroscopia de impedancia electroquímica (EIS) para evaluar la acción del dióxido de carbono sobre la corrosión de un acero estructural ASTM A 706 embebido en un concreto de escoria activado alcalinamente (AAS), el concreto AAS es una mezcla de escoria molida granulada, agregados finos y gruesos y solución alcalina (silicato de sodio) en la cantidad requerida para la mezcla de concreto. El estudio se realizó comparativamente con especímenes expuestos a condiciones naturales con una baja concentración de CO 2 (0,03% CO 2 ). La carbonatación del concreto se obtuvo de forma acelerada bajo condiciones controladas (3% CO 2 , 65% de humedad relativa y 20ºC de temperatura). Los datos de Impedancia fueron adquiridos en un rango de 1mHz hasta 100kHz. A las frecuencias altas se encontró la respuesta de la interfase medio de exposición-concreto y a frecuencias bajas la respuesta de la interfase correspondiente al concreto -acero. Mediante EIS se estableció la capacidad de lograr la pasivación del acero embebido en concreto AAS, en condiciones ambientales naturales y aceleradas. Palabras Clave: AAS, carbonatación, EIS AbstractIn this work the technique of impedance spectroscopy electrochemistry (EIS) was used to evaluate the effects of carbon dioxide on the corrosion of ASTM A 706 structural steel embedded in concrete with alkali activated slag (AAS), AAS concrete is a mixture of ground granulated slag, fine and coarse aggregates and alkaline solution (sodium silicate) in the amount required for the concrete mix. The study was conducted in comparison with specimens exposed to natural conditions with a low concentration of CO 2 (0.03% CO 2 ). The carbonation of the concrete was obtained through accelerated carbonation under controlled conditions (3% CO 2 , 65% of relative humidity and 20ºC of temperature). The data of Impedance in the middle frequency region 1mHz -100KHz.A high frequency response was found using the interface-specific exposure and low frequency response corresponding to the specific interface -steel. EIS was used to established the ability to achieve passivation of steel embedded in AAS concrete in natural and accelerated environmental conditions.

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Equivalent circuit for modelling the steel-concrete interface. I. experimental evidence and theoretical predictions

Cited by 165 publications

References 24 publications

Steel corrosion assessment by electrochemical impedance on metakaolin blended mortars

Steel corrosion assessment by electrochemical impedance on metakaolin blended mortars

Chloride-induced corrosion on reinforcing steel: from the fundamentals to the monitoring techniques

Monitoreo mediante EIS del acero embebido en un concreto de escoria activada alcalinamente expuesto a carbonatación

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