Characteristics of pitting corrosion in an existing reinforced concrete beam exposed to marine environment

Zhao, Yongjun; Xu, Xiaoyi; Wang, Yuzhou; Dong, Jianfeng

doi:10.1016/j.conbuildmat.2019.117392

Cited by 38 publications

(10 citation statements)

References 29 publications

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“…As a non‐contact measuring method, three‐dimensional (3D) laser scanning is able to realize the geometric measurement of objects with complex shapes. It has already been used in the research of many areas, such as rock cracking, 39 foundation deformation 40 and reinforcement corrosion 41 …”

Section: Resultsmentioning

confidence: 99%

“…It has already been used in the research of many areas, such as rock cracking, 39 foundation deformation 40 and reinforcement corrosion. 41 After acid pickling and drying in an oven, two corroded steel bars, i.e., the 600 mm bar and the left 300 mm bar, were scanned by the Shining3D scanning device with an accuracy of 0.02 mm. During the scanning, steel bar was fixed on the pedestal of the device, which rotated with a speed of 37 mm/s.…”

Section: Corrosion Distribution Of Steel Barsmentioning

confidence: 99%

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Spatial characteristics of stray current corrosion of reinforcing bars in pseudo concrete

Peng

Zhao

Gong

et al. 2022

Structural Concrete

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This paper focuses on the spatial characteristics of reinforcing‐bars corrosion under stray current. In the study, a corrosion experiment using a specimen with three steel bars embedded in pseudo concrete was carried out, the distribution of corrosion was obtained by three‐dimensional scanning. Further, a numerical model with the same dimension of the specimen was simulated to explain experimental results. The distribution of electric field driven by stray current was discussed in detail. Results show that by observation through the transparent matrix and by three‐dimensional scanning, the distribution of corrosion could be estimated qualitatively and quantitatively. Additionally, the spatial characteristics of corrosion state under stray current could be realized by the numerical simulation which combines polarization reaction with an extra stray current field. The stray current field around reinforcing bars was uneven in the cross‐sectional plane, leading to the difference of corrosion rate, which reflects the strong positive correlation between the field and corrosion rate.

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Section: Resultsmentioning

confidence: 99%

Section: Corrosion Distribution Of Steel Barsmentioning

confidence: 99%

Spatial characteristics of stray current corrosion of reinforcing bars in pseudo concrete

Peng

Zhao

Gong

et al. 2022

Structural Concrete

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“…It should be mentioned that there is little difference in corrosion non-uniformity between the two kinds of RC slabs in the experiment. The reasons may be as follows: On the one hand, the corrosion morphology of reinforcement is affected by numerous factors, such as the heterogeneity of the concrete microstructure (random distribution of coarse aggregate, pores, and initial defects) [ 40 , 41 ], the stochasticity of steel material [ 37 ], reinforcement placements [ 42 ], loading cracks [ 17 ], and rust-expansion-induced cracks. Bending cracks are not the only factor leading to uneven corrosion.…”

Section: Corrosion Characteristicsmentioning

confidence: 99%

Degradation of Steel Rebar Tensile Properties Affected by Longitudinal Non-Uniform Corrosion

2023

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Rebar corrosion is the primary cause of the durability degradation of reinforced concrete (RC) structures, where non-uniform corrosion is the typical pattern in engineering. This study experimentally and numerically investigated the tensile degradation properties of non-uniform corroded rebars. Corrosion morphology was accurately determined by three-dimensional (3D) laser scanning techniques, studying the characteristics of longitudinal non-uniform corrosion. The results showed that the non-uniformity of corrosion increased with an increase in corrosion levels. From tensile tests, the differences in nominal stress–strain curves among rebars with similar average corrosion levels indicated that corrosion non-uniformity has appreciable effects on the tensile behavior of rebars. The residual load-bearing capacity of corroded rebars was dominated by the reduced critical cross-section, while residual ductility was associated with the cross-section loss throughout the entire length of rebars. The degradation relations of nominal yield and ultimate strength, ultimate strain, and elongation after fracture were better correlated to the maximum cross-section loss than to the average volume loss. Additionally, numerical calculation based on the cross-sectional areas of corroded rebars was conducted to evaluate the tensile behavior of non-uniform corroded rebars. Equivalent distribution models simulating the longitudinal non-uniform corrosion were proposed, on the basis of probability characteristics of cross-sectional areas, for practical application of the numerical method.

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“…3,9 In this way, the chloride concentration can be progressively increased nearby and cause typical pitting corrosion. 10 Overall, the conductivity increases locally, further accelerating the electrochemical reactions. The consequent production of iron hydroxides then results in the formation of The presence of chlorides in concrete can derive from the initial contamination of the original building materials as well as by exposition to deicing salts or to the marine environment.…”

mentioning

confidence: 99%

“…The oxidation of metallic iron to Fe 2+ leads to the formation of Fe(OH) 2 and Fe(OH) 3 as corrosion products, which has a dual consequence. On the one hand, OH – ions are consumed, decreasing the pH of the concrete, and on the other hand, the chlorides are released to continue the catalytic process. , In this way, the chloride concentration can be progressively increased nearby and cause typical pitting corrosion . Overall, the conductivity increases locally, further accelerating the electrochemical reactions.…”

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confidence: 99%

Vertical-Flow Paper Sensor for On-Site and Prompt Evaluation of Chloride Contamination in Concrete Structures

et al. 2021

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Corrosion occurring in reinforced concrete has turned into a primary concern of the current century, concrete being the most ubiquitous and predominant material used in the construction industry. Among the many interrelated processes that trigger corrosion of metallic reinforcements, the penetration of chloride ions into the concrete matrix is the most insidious threat. Herein, we developed the first electrochemical device entirely made of paper that allows for the direct, prompt, and noninvasive evaluation of free chloride ion contamination in concrete-based constructions. Our device is based on a three-layer wax-modified filter paper, consisting of two Ag/AgCl screen-printed electrodes that are interfaced by a junction pad in a sandwich-like configuration. Filter paper allows for generating a vertical-flow potentiometric device capable of measuring the electrochemical potential between two solutions containing different concentrations of chloride ions, which are separately drop-cast on the top and bottom layers. After demonstrating the analytical performance of the device, the same principle was applied to the evaluation of the chloride contents in different concrete samples, exploiting paper as a suitable interfacing material for potentiometric measurements on the cement solid surface. Laboratory-prepared concrete samples with known chloride contents were first assessed, and then, the paper-based verticalflow device was applied to real concrete structures at the Giacomo ManzùMuseum (Ardea, Italy) for the evaluation of chloride contamination caused by the proximity to the seaside. The capability of our device to provide timely warning of the risk conditions of concrete-based artifacts was demonstrated.

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Characteristics of pitting corrosion in an existing reinforced concrete beam exposed to marine environment

Cited by 38 publications

References 29 publications

Spatial characteristics of stray current corrosion of reinforcing bars in pseudo concrete

Spatial characteristics of stray current corrosion of reinforcing bars in pseudo concrete

Degradation of Steel Rebar Tensile Properties Affected by Longitudinal Non-Uniform Corrosion

Vertical-Flow Paper Sensor for On-Site and Prompt Evaluation of Chloride Contamination in Concrete Structures

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