Degradation relationships for the mechanical properties of corroded steel rebars

Imperatore, Stefania; Rinaldi, Zila; Drago, Carlo

doi:10.1016/j.conbuildmat.2017.04.209

Cited by 168 publications

(98 citation statements)

References 28 publications

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“…In addition, adopting an the empirical coefficient α y = 0.0094, obtained by regression analysis, Equation 5is also plotted. The slope of the degradation trend model of the steel yield ratio is close to the analogous value observed in their experiments by Zhu et al (α y = 0.01) [29], and smaller than the value proposed by Imperatore et al (α y = 0.0151) [28].…”

Section: Empirical Relationship For the Yield Strength Of Corrosion-dsupporting

confidence: 86%

“…where f y,c and f y are the yield strength of the corroded and un-corroded steel rebars respectively, and Q c = (A sv,c − A sv )/A sv is the average corrosion degree, A sv,c and A sv being the area of transversal reinforcement in the corroded and un-corroded configuration, respectively. Five campaigns (230 specimens) of tensile tests on artificially corroded steel rebars [24][25][26][27][28] were considered. Only the specimens tested by Zhang et al [25] were obtained from both the natural corrosion process and an accelerated corrosion process.…”

Section: Empirical Relationship For the Yield Strength Of Corrosion-dmentioning

confidence: 99%

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Ultimate Shear of RC Beams with Corroded Stirrups and Strengthened with FRP

et al. 2019

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Transverse reinforcement plays a key role in the response behavior of reinforced concrete beams. Therefore, corrosion of steel stirrups may change the failure mode of elements from bending to shear, leading to a brittle and catastrophic crisis. It is important to strengthen reinforced concrete beams with corroded stirrups to enhance the shear resistance. This paper presents a formulation, based on the modified compression field theory, to estimate the ultimate shear of reinforced concrete beams strengthened with FRP, because of stirrup corrosion. The detrimental effect of corrosion on steel stirrup yield strength was taken into account by introducing an empirical decay law. The effective strain of FRP reinforcement was adequately evaluated by considering both debonding and tensile stress rupture. The proposed model was validated against collected experimental results, showing a good ability to evaluate shear strength. Moreover, a numerical analysis was carried out to highlight the role of the key parameters predicting the ultimate shear.

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Section: Empirical Relationship For the Yield Strength Of Corrosion-dsupporting

confidence: 86%

Section: Empirical Relationship For the Yield Strength Of Corrosion-dmentioning

confidence: 99%

Ultimate Shear of RC Beams with Corroded Stirrups and Strengthened with FRP

et al. 2019

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“…It is generally believed that the passive film of the rebar is formed on its surface, while the corrosion of the rebar also initiates from the surface and gradually extends into the matrix [11][12][13][14]. Thus, the surface state of the rebar significantly affects its passivation and anticorrosion performance, especially under the contamination of Cl − [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Surface Modification of Rusted Rebar and Enhanced Passivation/Anticorrosion Performance in Simulated Concrete Pore Solutions with Different Alkalinity

Song

Yang

Guo

et al. 2019

Metals

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Naturally exposed rusted rebar has been widely used for the production of reinforced concrete. However, rusted rebar is prone to corrosion under chloride ion (Cl−) contamination and/or at a low alkalinity of concrete. This study employed two surface modification methods, sand blasting and wire brushing, to augment the corrosion resistance of naturally exposed rusted rebar. Electrochemical tests revealed that the surface-modified rebar displayed a significant improvement of passivation in the concrete alkaline environment and anticorrosion performance in both the Cl− free and Cl−-containing simulated concrete pore solutions of different alkalinity. The enhanced performance was mainly due to the elimination of the rust layer and the direct exposure of the fresh metallic surface to the alkaline medium. Moreover, the effect of surface nanograins on the intensified passive film led to the best passivation performance of the wire-brushed rebar. The overall findings demonstrate that the two developed methods were conducive to the passivation and anticorrosion performance of the rusted rebar and thereby hold great promise for improving the service life of the reinforced concrete structures.

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“…According to (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12), we can determine the six parameters of skeleton curve of corroded compression-bending members. e difference of skeleton curve of the damaged and undamaged members is that they have the different the material parameters.…”

Section: Collapsing Shearing Force F Cud and Its Correspondingmentioning

confidence: 99%

“…For example, wind, waves, corrosive environment, and extreme temperatures all can impact the existing structures. During the entire service life of the RC structure, the continuous penetration of harmful ions induces cracking and spalling of the concrete cover [1][2][3], degradation of the bond strength [4][5][6][7], and decrease of the material strength [8][9][10][11][12]. In seismic-prone regions, the corrosion damage of the structures would reduce their lateral load-resisting capacity in a seismic event significantly [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

A Parameter Ascertainment Method for the Skeleton Curve of Corroded Reinforcement Concrete Members with Flexure and Compression

Chen

Zhang

Zhu

2018

Advances in Materials Science and Engineering

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is paper presents an effective method of parameter ascertainment for the skeleton curve of corroded compression-bending members to establish its restoring force model. An assumption which considers the skeleton curve of damaged and undamaged members has similar shape is introduced into the fitting process of parameters. Meanwhile, two-dimensional plane section assumption is used to simplify the mathematical model and reduce the computational cost. Several sets of experimental data were compared with the prediction by the method developed in this paper, for its verification. e case studies show that the experimental trends can be captured very well.

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Degradation relationships for the mechanical properties of corroded steel rebars

Cited by 168 publications

References 28 publications

Ultimate Shear of RC Beams with Corroded Stirrups and Strengthened with FRP

Ultimate Shear of RC Beams with Corroded Stirrups and Strengthened with FRP

Surface Modification of Rusted Rebar and Enhanced Passivation/Anticorrosion Performance in Simulated Concrete Pore Solutions with Different Alkalinity

A Parameter Ascertainment Method for the Skeleton Curve of Corroded Reinforcement Concrete Members with Flexure and Compression

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