Study on Characteristics of Residual Strength of Rc Beams With Defective Anchorages Due to Corrosion of Reinforcements

Murakami, Yuki; Dong, Wei; Oshita, Hideki; Suzuki, Shinichi; Tsutsumi, Tomoaki

doi:10.2208/jscejmcs.67.605

Cited by 3 publications

(3 citation statements)

References 5 publications

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“…The life span of reinforced concrete (RC) structures is generally around 50 years, and many structures currently require inspection and repair. The decrease in the durability of RC structures is primarily owing to corrosion of the reinforcing steel bars [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Evaluation of Corrosion Protection of Reinforcing Steel Bars Using Sugars

Sakakihara¹

2023

GEOMATE

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This study reports the effect of adding sugars to prevent corrosion of reinforcing bars. The reducing sugars aldose (sugar with an aldehyde group) and, ketose (sugar with a ketone group), and a nonreducing sugar and syrup with an expiration date were used in the experiments. Fehling's reaction, Benedict's reaction, and cyclic voltammetry (CV) tests were performed to investigate the effects of the various sugars on the reductive ability. Because the electrochemical oxidation of sugars requires electrocatalysts, electrodes containing particulate CuO catalysts were used in the experiments. The CV measurements were performed under alkaline conditions to simulate a reinforcing bar in the concrete. The experimental results revealed the influence of different types of sugars on the reductive ability. In Fehling's reaction, fructose was observed to be highly reductive, and its reaction rate was high. In Benedict's reaction, results obtained for waste syrup (WS) were similar to those of fructose, thereby confirming that WS can be used as a reducing sugar. The oxidation onset potentials in the electrochemical experiments were lower for fructose, WS, and glucose, in that order, which was the same as the order of the reaction rates in Benedict's reaction.

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Section: Introductionmentioning

confidence: 99%

Electrochemical Evaluation of Corrosion Protection of Reinforcing Steel Bars Using Sugars

Sakakihara¹

2023

GEOMATE

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“…Kakuda et [5] pointed out that the load-carrying mechanism changed with the corrosion level and corrosion location of longitudinal tension bars. The study of Marakami et [6] indicated that the corrosion of longitudinal bar led to the enhancement of tie-arch action of RC beams, but when the severe corrosion occurred in the vicinity of supporting zone, the tie-arch action could no longer sustain shear load due to the premature anchorage failure of longitudinal tension bars. Published research showed that the spatial distribution of bond degradation has a significant impact on the shear load-carrying mechanism, but there aren't unified cognition and conclusions, so it is worth to taking a further study.…”

Section: Introductionmentioning

confidence: 99%

Shear performance of RC beams with spatial distribution of bond deterioration in longitudinal tension bars

Xue

Yang²,

Zhang³

2016

Proceedings of the 2015 4th International Conference on Sustainable Energy and Environmental Engineering

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This paper carried out an experimental investigation on the effects of spatial distribution of bond degradation on the load-carrying mechanism and failure mode of RC beams. Bond degradation was simulated using artificial method and shear performance was investigated through three-point loading tests. Test results indicate that: It was more dangerous for RC beams have the bond deterioration area near the supporting position than in the vicinity of middle portions; compared with the control specimen placed with ordinary steel bars, the specimens using the steel bars with surface coating exhibited the same shear behavior.

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“…The flow chart of the corroded RC beams is proposed by Murakami et al; and the proposed decision points are the non-uniform corrosion of the main rebar, whether there are stirrups, the corrosion ratio of the stirrups and the anchorage performance. [1]. But, the failure mode shift can be attributed to the shift of the load resisting mechanism that is closely related to the transmission of bond performance.…”

Section: Introductionmentioning

confidence: 99%

Prediction Method of the Load Resisting Mechanisms in the Corroded RC Beams

Dong

Oshita

Tsutsumi

2014

AMR

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The failure mode of the corroded RC beam may shift from designed failure mode to others failure mode, as the load resisting mechanism changes due to the corrosion ratio of rebars. In this study, the load resisting mechanism and the failure mode of the corroded RC beam were investigated based on the bond performance. If the corroded RC beam is non-uniformly corroded, the beam suffers beam action and fails in flexural failure. Otherwise, the load resisting mechanism and the failure mode depend on the corrosion ratio of bottom portion stirrups. Moreover, the decision point is proposed to predict the load resisting mechanisms in the corroded RC beam.

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Study on Characteristics of Residual Strength of Rc Beams With Defective Anchorages Due to Corrosion of Reinforcements

Cited by 3 publications

References 5 publications

Electrochemical Evaluation of Corrosion Protection of Reinforcing Steel Bars Using Sugars

Electrochemical Evaluation of Corrosion Protection of Reinforcing Steel Bars Using Sugars

Shear performance of RC beams with spatial distribution of bond deterioration in longitudinal tension bars

Prediction Method of the Load Resisting Mechanisms in the Corroded RC Beams

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