Corrosion assessment of reinforced concrete structures exposed to chloride environments in underground tunnels: Theoretical insights and practical data interpretations

Li, Chen; Chen, Qing; Wang, Rulu; Wu, Mei; Jiang, Zhengwu

doi:10.1016/j.cemconcomp.2020.103652

Cited by 39 publications

(13 citation statements)

References 62 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Degradation of structures due to corrosion of embedded steel is considered one of the major durability problems faced by the construction industry [1][2][3][4][5]. The rate of steel corrosion is increased by the ingression of either chloride ion (Cl − ) or CO 2 into concrete, reducing the alkaline hydrated cement products that passivate (i.e., shield) the embedded steel.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Half-Cell Potential Measurements for Reinforced Concrete Corrosion

2022

View full text Add to dashboard Cite

The evaluation of half-cell potential measurements in reinforced concrete (RC) members can be a key issue for civil engineers. The primary reason for this is that the interpretation of half-cell potential measurements based on the available standards provides information related only to the possibility of corrosion in concrete, but it does not provide a clear perception of the influence of corrosion on the capacity of the RC members. The objective of this study is two-fold: (1) to explore the influence of corrosion level on the flexural capacity of RC members; and (2) to provide engineers with a better understanding of the correlation between half-cell potential measurements and flexural capacity of RC members. To establish this, twelve RC beams were cast and then exposed to accelerated corrosion utilizing an impressed current. After that, half-cell potential tests were performed on the entire surface of the beams. Next, a four-point loading test was performed on the beams to determine their flexural behavior. The analysis of measurements showed that there is a high positive correlation between the half-cell potential measurements and the flexural capacity of the tested beams which demonstrates the potential of half-cell measurements to predict the capacity degradation level of the RC beams due to corrosion.

show abstract

Section: Introductionmentioning

confidence: 99%

Evaluation of Half-Cell Potential Measurements for Reinforced Concrete Corrosion

2022

View full text Add to dashboard Cite

show abstract

“…Different calculation methods and model tests have been used to study the corrosion mechanism of rebars in underground tunnel structures. [17][18][19][20][21][22] Through several groups of model tests, Bertolini et al 17 studied the corrosion rate of rebars in underground concrete under the action of a direct current (DC) and alternating current (AC). Dolara et al 18 developed a numerical model for a simplified shield tunnel and determined the corrosion area of rebars exposed to stray current.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of corrosion effect on bending deflection of shield tunnel segment containing transverse cracks

Zhang

Jin

et al. 2022

Structural Concrete

View full text Add to dashboard Cite

Corrosion of the steel rebar will be generated in the cracked concrete of the shield tunnel during the operation period, which will reduce the bending performance of the tunnel segment. In this study, the effect of the rebar corrosion on the bending deflection of the shield tunnel segment that contains transverse cracks is investigated by experimental tests. The initial transverse cracks of the segment are simulated by a bending load device, and the galvanostatic method is used to simulate the corrosion of the segment rebar. The degradation of the segment bending deflection after the rebar corrosion process is measured and compared with the non‐corroded segment. The results reveal that when the depth of the transverse crack does not exceed the thickness of the protective layer, the corrosion of the rebar has little effect on the bending degradation. However, when the width and depth of the transverse crack reach approximately 1.2 and 210 mm, respectively, the degradation rate of bending deflection begins to increase rapidly.

show abstract

“…[10][11][12] However, electrochemical monitoring technology can only be adopted to evaluate the corrosion of steel rebars, but not the damage and deterioration of the entire RC structure. Also, the accuracy of the information obtained is affected by climatic conditions, for example, temperature and moisture 13 These drawbacks necessitate the exploration of other technologies for monitoring RC structures. Some of the NDTs that have been widely applied in recent years to monitor cracks in concrete structures caused by the corrosion of steel rebars include fiber optic sensing, 14 acoustic emission (AE) technology, 15 and ultrasonic monitoring.…”

Section: Introductionmentioning

confidence: 99%

Wave amplitude of embedded ultrasonic transducer-based damage monitoring of concrete due to steel bar corrosion

Zhang

Jia

Xiong

et al. 2021

Structural Health Monitoring

View full text Add to dashboard Cite

In this research, four embedded ultrasonic piezoelectric transducers were combined to form cross pair and opposite pair monitoring schemes for continuously monitoring the damage to different strength grades of concrete caused by the corrosion of reinforcements under accelerated corrosion conditions. The damage process was analyzed by combining the electrochemical effects of steel corrosion, that is, half-cell potential and galvanic current tests. Results show that the embedded ultrasonic transducer method can detect damage of concrete during steel corrosion and that each stage of damage can be determined from the plots of ultrasonic transducer data versus corrosion rate. The results further indicate that a combination of cross pair and opposite pair testing methods can more comprehensively reflect the damage to concrete caused by the expansion of corrosion of steel bars, than a single testing method. Since electrochemical testing can only depict the corrosion state of steel rebars, it is beneficial to use embedded ultrasonic measurements to monitor the damage process of concrete. The differences in damage between different strength grades of concrete, that is, the resistance to corrosion of steel bars and brittle failure, can be obtained from the plots of ultrasonic transducer data.

show abstract

Corrosion assessment of reinforced concrete structures exposed to chloride environments in underground tunnels: Theoretical insights and practical data interpretations

Cited by 39 publications

References 62 publications

Evaluation of Half-Cell Potential Measurements for Reinforced Concrete Corrosion

Evaluation of Half-Cell Potential Measurements for Reinforced Concrete Corrosion

Experimental investigation of corrosion effect on bending deflection of shield tunnel segment containing transverse cracks

Wave amplitude of embedded ultrasonic transducer-based damage monitoring of concrete due to steel bar corrosion

Contact Info

Product

Resources

About