Corrosion rate of ordinary and high-performance concrete subjected to chloride attack by AC impedance spectroscopy

Ismail, Mohamed A.; Ohtsu, Masayasu

doi:10.1016/j.conbuildmat.2005.01.062

Cited by 88 publications

(43 citation statements)

References 15 publications

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“…A capacitive arc was observed at high frequency (usually in the 10 6 -100 Hz range), attributed to the dielectric properties of the bulk mortar [43,44]. The impedance response at frequencies lower than 100 Hz was associated with the charge transfer reactions on the rebar surface, giving information on the corrosion process [43,45,46]. However, the Nyquist plot for the mortars exposed to standard laboratory conditions showed three capacitive arcs.…”

Section: Electrochemical Impedance Spectroscopy (Eis)mentioning

confidence: 98%

“…However, the Nyquist plot for the mortars exposed to standard laboratory conditions showed three capacitive arcs. The first time constant (at frequencies above 100 Hz) was associated with the dielectric properties of the bulk mortar, and the second time constant in the intermediate frequency range (usually in the 100-2.51 Hz range) was connected with the presence of the interface film [43,45,46]. The impedance response at frequencies lower than 2.51 Hz was associated with the steel surface corrosion processes.…”

Section: Electrochemical Impedance Spectroscopy (Eis)mentioning

confidence: 99%

“…8a is comprised of parallel resistance (R) and constant phase element (CPE) combinations, where two such combinations are arranged in series to construct the full EEC. The first combination (R-CPE m ) is linked to the electrolyte (R e ) and bulk matrix (R m ) resistances and the bulk matrix capacitance [45,46], respectively, where the total resistance R is given by 1/R = 1/R e ? 1/R m .…”

Section: Electrochemical Impedance Spectroscopy (Eis)mentioning

confidence: 99%

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Influence of slag composition on the stability of steel in alkali-activated cementitious materials

et al. 2017

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Among the minor elements found in metallurgical slags, sulfur and manganese can potentially influence the corrosion process of steel embedded in alkali-activated slag cements, as both are redox-sensitive. Particularly, it is possible that these could significantly influence the corrosion process of the steel. Two types of alkali-activated slag mortars were prepared in this study: 100% blast furnace slag and a modified slag blend (90% blast furnace slag ? 10% silicomanganese slag), both activated with sodium silicate. These mortars were designed with the aim of determining the influence of varying the redox potential on the stability of steel passivation under exposure to alkaline and alkaline chloride-rich solutions. Both types of mortars presented highly negative corrosion potentials and high current density values in the presence of chloride. The steel bars extracted from mortar samples after exposure do not show evident pits or corrosion product layers, indicating that the presence of sulfides reduces the redox potential of the pore solution of slag mortars, but enables the steel to remain in an apparently passive state. The presence of a high amount of MnO in the slag does not significantly affect the corrosion process of steel under the conditions tested. Mass transport through the mortar to the metal is impeded with increasing exposure time; this is associated with refinement of the pore network as the slag continued to react while the samples were immersed.

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Section: Electrochemical Impedance Spectroscopy (Eis)mentioning

confidence: 98%

Section: Electrochemical Impedance Spectroscopy (Eis)mentioning

confidence: 99%

Section: Electrochemical Impedance Spectroscopy (Eis)mentioning

confidence: 99%

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Influence of slag composition on the stability of steel in alkali-activated cementitious materials

et al. 2017

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“…Cylindrical mortar reinforced samples were cast following the approach of Ismail & Ohtsu 5 , where mortar specimens were 0.10 m high and 0.05 m in diameter, with a 0.10-m-long, 0.0055-m-diameter steel bar embedded in the center. The mortar samples were cylindrical to assure a radial and equidistant chloride attack on the steel bar from the outer surface.…”

Section: Test Proceduresmentioning

confidence: 99%

“…However, electrochemical techniques such as linear polarization and electrochemical impedance spectroscopy (EIS) have begun to be used in some recent concrete research. Although these techniques have previously been employed mainly in the study of corrosion mechanisms in metals and coatings, it is possible to determine the behavior of both, concrete and reinforcing steel [4][5][6][7][8] . With these issues in mind, this paper is focused on the study of corrosion phenomena in mortars blended with metakaolin using electrochemical impedance spectroscopy.…”

Section: Introductionmentioning

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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Electrochemical characterization and corrosion behavior of an Fe‐Mn‐Si shape memory alloy in simulated concrete pore solutions

Lee

Partovi‐Nia

Suter

et al. 2015

Materials & Corrosion

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The corrosion behavior of an Fe‐17Mn‐6Si‐10Cr‐4Ni‐1(V,C) shape memory alloy was investigated using electrochemical methods with regard to its applications as reinforcing element in pre‐stressed concrete structures. The alloy was tested in three kinds of simulated concrete pore solutions, and open circuit potential and linear polarization resistance were monitored with and without chloride addition. The results were compared with a reference material of conventional structural steel, so called S500 (EN 10149 PT2 standard). It is shown that the shape memory alloy has superior corrosion resistance than the reference material steel S500, and, therefore, can be used as pre‐stressed reinforcing element in concrete without any serious corrosion problem. Several practical issues that can influence the corrosion behavior of the alloy in its use of pre‐stressing reinforcements, such as the effects of strain and surface oxidation by heating, have been also discussed through the electrochemical tests in the simulated concrete pore solutions.

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Corrosion rate of ordinary and high-performance concrete subjected to chloride attack by AC impedance spectroscopy

Cited by 88 publications

References 15 publications

Influence of slag composition on the stability of steel in alkali-activated cementitious materials

Influence of slag composition on the stability of steel in alkali-activated cementitious materials

Steel corrosion assessment by electrochemical impedance on metakaolin blended mortars

Electrochemical characterization and corrosion behavior of an Fe‐Mn‐Si shape memory alloy in simulated concrete pore solutions

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