The Effect of Crack Width on Chloride-Induced Corrosion of Steel in Concrete

Li, Weiwei; Liu, Weiqing; Wang, Shuguang

doi:10.1155/2017/3968578

Cited by 18 publications

(9 citation statements)

References 12 publications

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“…They concluded that ''the problem of reinforcement corrosion in crack zones cannot solely be solved by crack width limitation in the range from roughly 0.3 to 0.5 mm''. Li et al [28], observed the influence of surface crack width over the span of two years, and found that the highest corrosion rate consistently corresponded to the larger crack width through the entire duration of the experiments. However, in the same study, the difference in corrosion rate between specimens with different surface crack widths was observed to reduce substantially over time during the two years study.…”

Section: H2: Crack Width and Corrosion Ratementioning

confidence: 97%

Impact of cracks on distribution of chloride-induced reinforcement corrosion

et al. 2022

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Surface crack width is regulated in codes to limit corrosion of reinforcement bars in concrete. However, the influence of surface crack width on corrosion damages is not directly inferable from previous research.In this work, data on corroded cracked concrete specimens in chloride environments was compiled. Detailed information was included, such as crack and pit locations, local corrosion pattern, etc. Five hypotheses on the influence of transversal cracks on corrosion damage were formulated, and statistical methods were used to test them on the dataset.Transversal cracks were good indicators of the position of corrosion pits. The corrosion rate of the pit increased in proximity of a crack. With time, pits grew in depth at a slower rate but increased in number. No clear correlation between surface crack width and corrosion damage was found. Results point out discrepancies in the collected data, arguing for the need of well-defined procedures for assessing crack and corrosion damage.Further, the statistical treatment allowed for identification of bias in existing data, which was used as a research planning tool to provide guidance on the design of additional experiments. Thus, recommendations for future experimental work required to reduce the bias are given.

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Section: H2: Crack Width and Corrosion Ratementioning

confidence: 97%

Impact of cracks on distribution of chloride-induced reinforcement corrosion

et al. 2022

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“…The mechanism as well will depend on the local resistivity and the amount of chlorides. As a summary, it may be better not trying to define whether micro-or macrocell is the predominant mechanism, even in the cases where the bar is cut in pieces and the galvanic current recorded, for example, Reference [72] or the bar is instrumented (galvanic currents cannot be recorded), for example, Reference [64,82], unless different resistivity and debonding levels are tested, which are not the case until present. Regardless, different viewpoints are still identified in the literature with regards to which mechanisms is predominant, accentuating the need for further relevant research.…”

Section: Additional Aspectsmentioning

confidence: 99%

A review on the effects of cracking and crack width on corrosion of reinforcement in concrete

Kanavaris,

Coelho,

Ferreira

et al. 2023

Structural Concrete

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It is widely known that corrosion is one of the main problems that reinforced concrete structures may endure during their life‐cycle. This problem is usually tackled in a prescriptive manner, by limiting the crack width allowed to occur during structures' service life. In an attempt to better understand the effect that cracking and crack width can have on the corrosion process, as well as systematize the existing work in the field, this paper presents a summary of an in‐depth literature review on the topic of reinforcement corrosion in concrete. The main focus is devoted to chloride‐induced corrosion since that is the most widely studied corrosion mechanism, even though carbonation‐induced corrosion is also relatively briefly discussed. The paper also presents an overview of the existing guidelines that have been used in the past to analyze and support decision‐making regarding corrosion in reinforced concrete structures.

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“…Numerous studies have conducted accelerated corrosion tests based on electrochemical techniques to determine the relationship between the width of the concrete surface corrosion crack and the degree of reinforcement corrosion (Li et al, 2017). The rate of diffusion of harmful materials is limited due to the poor permeability of the concrete.…”

Section: Introductionmentioning

confidence: 99%

Influence of pre-existing cracks and concrete cover on service life of reinforced concrete and mechanical behaviour of corroded rebars

Yadeta,

Siriwardane,

Mohammed

et al. 2024

IJSI

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PurposeIncorporating pre-existing crack in service life prediction of reinforced concrete structures subjected to corrosion is crucial for accurate assessment, realistic modelling and effective decision-making in terms of maintenance and repair strategies.Design/methodology/approachAn accelerated corrosion test was conducted by using impressed current method on cylindrical specimens with varying cover thickness and crack width. Mechanical properties of the specimens were evaluated by tensile tests.FindingsThe results show that, the pre-cracked samples exhibited shorter concrete cover cracking times, particularly with wider cracks when compared to the uncracked samples. Moreover, the load-bearing capacity of the reinforcement bars decreased owing to the pre-cracks, causing structural deflection and a shortened yield plateau. However, the ductility index remained consistent across all sample types, implying that the concrete had good overall ductility. Comparing the results of the non-corroded rebar and corroded rebar samples, the maximum reduction in the yield load was 25.22%, whereas the maximum reduction in the ultimate load was 26.23%. The simple mathematical model proposed in this study provides a reliable method for predicting the chloride ion diffusion coefficient in cracked concrete of existing reinforced concrete structures.Originality/valueA simple mathematical model was proposed for evaluation of the equivalent chloride ion diffusion coefficient considering crack width, average crack spacing and crack extending lengths for cracked reinforced concrete structures, which is used to incorporate existing crack in service life prediction models.

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The Effect of Crack Width on Chloride-Induced Corrosion of Steel in Concrete

Cited by 18 publications

References 12 publications

Impact of cracks on distribution of chloride-induced reinforcement corrosion

Impact of cracks on distribution of chloride-induced reinforcement corrosion

A review on the effects of cracking and crack width on corrosion of reinforcement in concrete

Influence of pre-existing cracks and concrete cover on service life of reinforced concrete and mechanical behaviour of corroded rebars

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