Effect of Crack Width and Bar Types on Corrosionof Steel in Concrete

Mohammed, Tarek Uddin; Otsuki, Nobuaki; Hisada, Makoto; Shibata, T.

doi:10.1061/(asce)0899-1561(2001)13:3(194)

Cited by 99 publications

(53 citation statements)

References 5 publications

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“…Although a correlation does not seem to exist between the crack width in concrete and the corrosion rate of embedded reinforcement in the long term [4,5,6], a relation has been observed between crack width and corrosion rate at early stages [7]. Most of the available research investigating the relation between crack width and corrosion is, however, based on cracks measured at the surface, which are greatly dependent on the cover depth.…”

Section: Introductionmentioning

confidence: 99%

Characterisation of bending cracks in R/FRC using image analysis

Berrocal

Löfgren

Görander

et al. 2016

Cement and Concrete Research

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In this study, experiments were conducted to induce bending cracks of specific surface crack width to reinforced concrete beams made of plain concrete (RC) and reinforced concrete beams made of fibre reinforced concrete (R/FRC). After injecting and impregnating the cracks with dyed epoxy resin, image processing and analysis were employed to investigate the internal crack morphology. Several crack features including crack width (accumulated, effective and maximum), branching and tortuosity were defined and quantified. The results showed that in addition to arrested crack development, the presence of fibres yielded a distinctive change in the internal crack pattern, including increased branching and tortuosity, both of which have positive implications regarding concrete permeation. Likewise, specimens with fibres exhibited reduced maximum individual crack widths near the rebar, potentially increasing the ability of autogenous crack healing and reducing the risk of corrosion initiation.

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Section: Introductionmentioning

confidence: 99%

Characterisation of bending cracks in R/FRC using image analysis

Berrocal

Löfgren

Görander

et al. 2016

Cement and Concrete Research

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“…The chloride contents of three points bending test was experimental investigated by several researchers such as [12]. However, there are no experiments deal with the initial curing temperatures.…”

Section: Initial Cracks By Three-point Loadingmentioning

confidence: 99%

Combined Effect of Initial Curing Temperature and Crack Width on Chloride Penetration in Reinforced Concrete Beams

et al. 2018

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Abstract. Reinforced concrete (RC) structures are gradually being degraded all over the world, largely due to corrosion of the embedded steel bars caused by an attack of chloride penetration. Initial curing would be regarded as one factor influencing chloride diffusion in concrete in combination with cover cracking that is also of great attention for reinforced structures. In this study, a non-steady state diffusion test of chloride ion involving RC beam specimens with a water-to-cement ratio of 0.5, initial curing temperatures of 5°C or 20°C and three types of crack widths ranging from 0 to 0.2mm was performed. Chloride content at 5°C or was determined. The results show that the higher chloride content was obtained in condition of crack width large than 0.1mm with low initial curing temperature and there are no obvious differences in chloride content when the crack width was not larger than 0.1mm.

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“…In contrary, rather than crack widths, the surrounding concrete (i.e., concrete resistance, oxygen permeability, and chloride ion content) more contributed to the corrosion rate of steel bars in concrete, it is expected that with any size of cracks [2]. On the other hand, high strength prestressing steels show a far more sensitive reaction to corrosion attack than reinforcing bars.…”

Section: Introductionmentioning

confidence: 95%

Prestress Loss and Bending Capacity of Pre-cracked 40 Year-Old PC Beams Exposed to Marine Environment

Dasar

Irmawaty

Hamada

et al. 2016

MATEC Web of Conferences

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Abstract. Six prestressed concrete beams (PC beam) were used for evaluation, consist of four post-tension beams (PC-O) and two pre-tension beams (PC-R). In order to investigate the effect of crack on prestress loss and bending capacity after long-term exposed, prestressed concrete beams were pre-crack and then exposed to marine environment. Experimental work was carried out to evaluate PC beams performance after long-term exposed. In addition, visual observations and load bearing capacity test was carried out. Furthermore, evaluation of prestress loss conducted using three-point loading bending test and the remaining tendon forces in the beam were determined using Crack Re-opening Method. The experimental results revealed that prestress loss was increased due to corrosion of strand/wire which affected by the pre-crack on the prestressed beams. Approximately a prestress loss around 26% and 30% was recorded for post-tension and pre-tension beams respectively.

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Effect of Crack Width and Bar Types on Corrosionof Steel in Concrete

Cited by 99 publications

References 5 publications

Characterisation of bending cracks in R/FRC using image analysis

Characterisation of bending cracks in R/FRC using image analysis

Combined Effect of Initial Curing Temperature and Crack Width on Chloride Penetration in Reinforced Concrete Beams

Prestress Loss and Bending Capacity of Pre-cracked 40 Year-Old PC Beams Exposed to Marine Environment

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