Chloride Corrosion of Reinforcing Steel in Cracked Concrete

Okada, Kiyoshi; Koyanagi, Wataru; Miyagawa, Toyoaki

doi:10.2208/jscej1969.1979.75

Cited by 9 publications

(6 citation statements)

References 2 publications

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“…Some authors (Okada and Miyagawa 1980) suggest the presence of a correlation between crack width and corrosion of reinforcement. Based on test results of beams under sustained load (El Maaddawy et al 2005), a reduction of 44% of the time for corrosion crack initiation is evidenced in comparison with unloaded beams; moreover the longitudinal crack opening increase shows a higher rate even if the asymptotic value is practically the same for loaded and unloaded structures.…”

Section: Introductionmentioning

confidence: 99%

Reinforced Concrete Members Subjected to Cyclic Tension and Corrosion

Giordano

Mancini

Tondolo

2011

ACT

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Deterioration process due to corrosion of steel in concrete affects the performance of reinforced concrete structures both in service and ultimate conditions. Corrosion reduces the rebar section, deteriorates the surrounding concrete with the oxides expansion product and it also alters bond between steel and concrete. Moreover, in structures subjected to cyclic loading, the damage due to corrosion can be combined with the mechanical action that is present in service. In this case the initial crack pattern due to load action and to the rheological phenomena is further modified by the expansion of the oxides and by the interaction among those causes. In the present work, the results of an experimental campaign on reinforced concrete elements subjected to simultaneous corrosion and cyclic loading are shown. It is put in evidence the loss of structural performance, by effect of chemical degradation and mechanical action. The key role of the combined effect of those causes of deterioration is also confirmed by static tests performed under the condition of static loading and simultaneous corrosion.

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Section: Introductionmentioning

confidence: 99%

Reinforced Concrete Members Subjected to Cyclic Tension and Corrosion

Giordano

Mancini

Tondolo

2011

ACT

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“…9(b) shows the results for a specimen without cracks or a specimen with the cracks repaired. Some previous studies have shown that the CR is higher when the crack width is larger [26,27] whereas others have shown that the crack width is almost unrelated to the CR [11,12]. In this study, the crack width was found to be irrelevant in the range of 0.2-0.6 mm.…”

Section: Discussionmentioning

confidence: 44%

“…To address this issue, a method for evaluating the CR of steel bars after crack initiation is required. Several studies have experimentally evaluated the chloride-induced CR of the steel bar in cracked concrete [8][9][10][11][12][13]. These prediction models or factor analyses have been developed using polarization resistance (PR) monitoring.…”

Section: Introductionmentioning

confidence: 99%

Applicability of AC impedance method for measuring time-variant corrosion rate to cracked and crack-repaired reinforced concrete

Kanemitsu

Takaya

2023

Mater Struct

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Purpose Several models of the time-variant corrosion rate (CR) have been proposed to predict the service life of reinforced concrete (RC) structures based on polarization resistance (PR) monitoring. However, few of them have veri ed the accuracy by comparing the estimated corrosion weight loss (CWL) obtained from the PR monitoring with the actual CWL. In addition, few studies have measured the time-variant CR on crack-repaired RC specimens, and the evaluation of repair e cacy is clearly an essential step in the maintenance of the structures. This study aims to clarify the applicability of the alternating current (AC) impedance method, one of the PR methods, to cracked and crack-repaired RC. Methods The CRs in such RC in an accelerated corrosion environment were measured every one to three months over three years using the AC impedance method. To con rm accuracy, the corroded area and CWL of the steel bars were measured. Results The results clarify that the measurement area of the AC impedance method was almost equal to the corroded area, which indicates that the corrosion area should be calculated in addition to the CWL for accuracy veri cation. The results also show that the AC impedance method can be applied to cracked and crack-repaired RC for measuring time-variant CR. Conclusion The CR increases rapidly after crack initiation but becomes constant with time, and early crack repair can delay corrosion progress in cracked RC to the same extent as in uncracked concrete.

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“…Several researchers found a clear relationship between crack width and corrosion rate (Okada and Miyagawa 1980;Ohno et al 1986) in the case that a crack permits oxygen and chloride ions to reach the steel bars. Furthermore, Suzuki et al (1990) reported that for specimen with a single crack, the steel bars in a cracked area were depassivated earlier than in an uncracked area which was attributed to macrocell corrosion.…”

Section: Introductionmentioning

confidence: 99%

Application of Sacrificial Point Anode for Prevention of Steel Corrosion in Cracked Concrete

Caronge

Hamada

Irmawaty

et al. 2015

ACT

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The effectiveness of a commercially available sacrificial point anode for corrosion prevention of steel in cracked concrete is presented. Reinforced concrete prisms with dimensions of 150 mm x 150 mm x 500 mm were prepared with a water to cement ratio (W/C) of 0.4 showing crack widths ranging from 0.1 to 0.4 mm obtained by pre-cracking. These specimens were exposed to three conditions: (1) laboratory air (temperature of 20±2°C and relative humidity of 60%); (2) immersed in 3% NaCl solution; and (3) dry/wet cycles of above mentioned conditions. Measurements included the free corrosion potential, polarization behavior of the sacrificial point anode, anodic-cathodic polarization curve of the reinforcement steel and visual observation. The test results show that the sacrificial point anode was effective to prevent the embedded steel from corrosion in cracked concrete. Specimens exposed to dry/wet cycles or immersed in 3% NaCl solution demonstrated a better protection than those exposed to laboratory air due to the high moisture condition. Thus, a sacrificial point anode becomes active to protect the steel bars even in cracked concrete.

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Chloride Corrosion of Reinforcing Steel in Cracked Concrete

Cited by 9 publications

References 2 publications

Reinforced Concrete Members Subjected to Cyclic Tension and Corrosion

Reinforced Concrete Members Subjected to Cyclic Tension and Corrosion

Applicability of AC impedance method for measuring time-variant corrosion rate to cracked and crack-repaired reinforced concrete

Application of Sacrificial Point Anode for Prevention of Steel Corrosion in Cracked Concrete

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