Chloride-induced corrosion of steel reinforcement – Mechanical performance and pit depth analysis

Apostolopoulos, Charis; Demis, Sotiris; Papadakis, Vagelis G.

doi:10.1016/j.conbuildmat.2012.07.087

Cited by 265 publications

(129 citation statements)

References 31 publications

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“…In this context, the reinforcement corrosion by the action of chlorides is characterized as being by pits, since the chlorides have the capacity of breaking locally the existing passivating layer. In consequence, the corrosion is propagated in the pit, according to the stack active-passive in non polarized conditions [1,10,11]. Studies of Almussallan [12], Apostolopoulos et al [10] and François et al [8] may be mentioned among the researches contemplating the reinforcement corrosion made in laboratory.…”

Section: Introductionmentioning

confidence: 99%

“…In consequence, the corrosion is propagated in the pit, according to the stack active-passive in non polarized conditions [1,10,11]. Studies of Almussallan [12], Apostolopoulos et al [10] and François et al [8] may be mentioned among the researches contemplating the reinforcement corrosion made in laboratory. In the perspective of reinforcement corroded obtained from real structures, it is possible to mention studied from Palssom e Mirza [5], Papadopoulos et al [17], Zhang et al [16] and Balestra et al [11].…”

Section: Introductionmentioning

confidence: 99%

“…The author points to sudden fractures with corrosion degree over 12%. Apostolopoulos et al [10] submitted bars directly exposed to salt fog and also bars embedded in concrete exposed to the same mist. The authors highlight that comparing bars with the same corrosion degree, the bars immersed in concrete show a greater reduction regarding the yield strength and ductility and greater depth of pits than the ones directly exposed to salt fog.…”

Section: Introductionmentioning

confidence: 99%

“…It has been observed that most of the works regarding the evaluation of the mechanical properties of corroded rebars is about accelerated corrosion tests in laboratory environment. It must be highlighted that, depending on the methodology used to promote the reinforcement corrosion -salt chambers for instance -those works may not generate the formation of the passivating layer that cover the reinforcement inside the concrete due to the alkaline pH of the mean; this results in an uniform attack, and, in consequence, differences regarding the corrosion mechanism [6,8,10,[12][13][14][15][16]. In this context, the reinforcement corrosion by the action of chlorides is characterized as being by pits, since the chlorides have the capacity of breaking locally the existing passivating layer.…”

Section: Introductionmentioning

confidence: 99%

“…Besides, the corrosion products generate tensions in the radial direction to the axis of the bars that are not supported by the limited plastic deformation of concrete, leading to cracking and posterior displacement of the concrete cover [7][8][9]. The mechanism of corrosion leading to the degradation of the reinforcement has been an object of research in the whole world, however, the influence of natural corrosion on the mechanical properties of the reinforcement represent a smaller part of those studies [6,10,11]. It has been observed that most of the works regarding the evaluation of the mechanical properties of corroded rebars is about accelerated corrosion tests in laboratory environment.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Effect of corrosion degree on mechanical properties of reinforcements buried for 60 years

Balestra

Lima

Mendes

et al. 2018

Rev. IBRACON Estrut. Mater.

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ResumoThis paper studies the influence of the corrosion degree calculated by the mass loss and by the smaller diameters on the yield strength, ultimate strength and final elongation. Reinforcements buried and naturally corroded for 60 years were studied. The mechanical properties of the protruding reinforcing steel were compared to reference bars, which also remained buried for 60 years, but without going through the corrosion process. Micrographs, besides the chemical composition and the characterization of the aggressiveness of the soil were realized. The micrographs and the chemical composition show the presence of pits in the reinforcements and sulfur contents for steel above the prescriptions of the time when the foundations were initially implement, respectively. The results also show that the effects of pitting corrosion on the mechanical properties of the naturally corroded bars may not be adequately expressed by the mass loss. This type of corrosion (pits) produces geometric variations in the cross sections along the length of the test specimens, generating stress gradients between successive sections. This has a noticeable impact on the mechanical properties of the reinforcements. In general, the effects of corrosion are more pronounced on the ductility of the reinforcement. Regarding the aggressiveness of the soil, high corrosion rates were identified in the reinforcement, even with the soil being classified as essentially non-corrosive.Keywords: reinforcement corrosion, durability, mass loss, smallest diameter, corrosion degree, mechanical properties.Este artigo estuda a influência do grau de corrosão, calculado pela perda de massa e pelos menores diâmetros, sobre a resistência ao escoamento, limite de resistência e alongamento final em armaduras corroídas naturalmente. Essas armaduras permaneceram enterradas por 60 anos. As propriedades mecânicas das armaduras de espera foram comparadas às de barras de referência, que também permaneceram enterradas por 60 anos, mas sem sofrer o processo de corrosão. Foram realizadas micrografias, além da determinação da composição química e da caracterização da agressividade do solo onde as armaduras estavam enterradas. As micrografias e a composição química mostram a presença de pites nas armaduras e teores de enxofre acima das prescrições recomendadas para o aço na época de execução das fundações, respectivamente. Os resultados também mostram que os efeitos da corrosão por pites sobre as propriedades mecânicas das barras corroídas naturalmente podem não ser adequadamente expressos pela perda de massa. Esse tipo de corrosão (pites) produz variações geométricas nas seções transversais ao longo do comprimento dos corpos de prova, gerando gradientes de esforços entre seções sucessivas, que impactam de forma notória sobre suas propriedades mecânicas. De uma maneira geral, os efeitos da corrosão são mais pronunciáveis sobre a ductilidade das barras. Com relação à agressividade do solo, altas velocidades de corrosão foram identificadas nas armaduras, mesmo com o...

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Effect of corrosion degree on mechanical properties of reinforcements buried for 60 years

Balestra

Lima

Mendes

et al. 2018

Rev. IBRACON Estrut. Mater.

View full text Add to dashboard Cite

show abstract

Corrosion Performance of High Strength Weathering Steels Under Different Heat Treatment States

Wang¹,

Liu²,

Liu³

et al. 2015

HSLA Steels 2015, Microalloying 2015 &Amp; Offshore Engineering Steels 2015

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A spectromicroscopy study of the corrosion of fusion‐bonded epoxy–coated rebar

Situm

Guo

et al. 2019

Surface & Interface Analysis

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Funding information Natural Sciences and Engineering Research Council of CanadaReported herein is an analysis of accelerated corrosion of a commercially coated fusion-bonded epoxy rebar sample using an X-ray spectromicroscopy methodology that involves the combination of X-ray fluorescence mapping (XRF) and micro X-ray absorption near-edge spectroscopy (μ-XANES). XRF maps collected using an excitation energy of 7115 eV reveal a sharp contrast between corroded and noncorroded sample areas after correction for topography effects that can be confirmed by Fe K-edge μ-XANES. This X-ray spectromicroscopy methodology allows for the study of corrosion through commercially prepared polymer-coated rebar coatings without any modification to the polymer film prior to analysis and is suitable for long-term testing of the corrosion of these materials under real-world conditions.

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Chloride-induced corrosion of steel reinforcement – Mechanical performance and pit depth analysis

Cited by 265 publications

References 31 publications

Effect of corrosion degree on mechanical properties of reinforcements buried for 60 years

Effect of corrosion degree on mechanical properties of reinforcements buried for 60 years

Corrosion Performance of High Strength Weathering Steels Under Different Heat Treatment States

A spectromicroscopy study of the corrosion of fusion‐bonded epoxy–coated rebar

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