Corrosion behavior of pre-rusted rebars after placement in concrete

Al-Tayyib, A.J.; Khan, Msh; Allam, I.M.; Al-Mana, A.I.

doi:10.1016/0008-8846(90)90059-7

Cited by 29 publications

(11 citation statements)

References 1 publication

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“…One of the many reasons for this is that pre-existing layers of mill-scale or rust, which may or may not be present on the metal surface prior to its embedment in concrete, are liable to affect the ease with which passivation and depassivation processes will occur, as has been noted by numerous researchers [3][4][5][6][7][8][9][10][11][12]. Such layers of mixed oxides and hydrated oxides of iron, whose natures and thicknesses depend on features of the alloy composition, the manufacturing process and the vagaries of storage, are notoriously variable and difficult to characterise.…”

Section: Introductionmentioning

confidence: 99%

Initiation of chloride‐induced corrosion of steel in concrete: role of the interfacial zone

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2009

Materials & Corrosion

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This paper provides a brief review of research aimed at characterising the steelconcrete interfacial zone (SCIZ) and its influence on the susceptibility of the metal to pitting corrosion when concrete is exposed to environments that cause ingress of chloride ions accompanied by leaching of hydroxyl ions. For reinforced concrete made from Portland cements, exposed to aqueous solutions of sodium chloride, the buffering effect of solid calcium hydroxide (portlandite) at pH $12.6 has been shown to restrain the gradual decline in the hydroxyl ion concentration of the concrete pore solution phase at depths corresponding to the embedded steel. When the concrete is produced under laboratory conditions that are carefully controlled to exclude macroscopic defects from the SCIZ and the steel is cleaned before being embedded, this can lead to observed chloride threshold levels being consistently greater than 1% chloride by mass of cement. The buffering action of cement hydration products formed in the SCIZ is believed to be partly responsible for this high tolerance to chloride-induced corrosion because it counters the generation of 'anodic acidity' that is a necessary condition for stable growth of pits to occur. Translating this behaviour of laboratory specimens to the performance of full-scale reinforced concrete structures has often proved difficult in the past and there is a need for further research in this area, particularly in relation to the role of non-traditional cements.

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Section: Introductionmentioning

confidence: 99%

Initiation of chloride‐induced corrosion of steel in concrete: role of the interfacial zone

Page

2009

Materials & Corrosion

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“…The influence of pre-formed rust scales was considered a weaker influencing factor than the manufacturing process or the metal microstructure. Al-Tayyib et al [43] reported that pre-rusting did not promote corrosion initiation of rebars embedded in concrete.…”

Section: Mill Scale and Pre-existing Rust Layersmentioning

confidence: 99%

“…A number of studies [24,37,38,[42][43][44] suggested that the effect of pre-existing rust layers on corrosion initiation may be different from that of mill scale. Mohammed and Hamada [44] as well as Chen et al [38] reported that Ccrit was lower in the presence of mill scale with additional rust than with mill scale alone.…”

Section: Mill Scale and Pre-existing Rust Layersmentioning

confidence: 99%

The effect of the steel–concrete interface on chloride-induced corrosion initiation in concrete: a critical review by RILEM TC 262-SCI

et al. 2019

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“…The main reason is that the rust acts as a barrier for alkaline solution from concrete and also as a crevice in which corrosion simulating anions concentrate by migration to anodic sites [22]. However, some researchers indicated that initial pre-rusting of the rebars did not affect its corrosion at the core of the concrete and that this could even be beneficial [24,25]. M. Maslehuddin reported that the corrosion rate of reinforcement corrosion in concrete specimens prepared with corroded steel bars exposed to atmosphere for 12 months and salt spray was lower than that of the unexposed regular rebar (fabricated via hot rolling) bars.…”

Section: Introductionmentioning

confidence: 99%

Surface Modification of Rusted Rebar and Enhanced Passivation/Anticorrosion Performance in Simulated Concrete Pore Solutions with Different Alkalinity

Song

Yang

Guo

et al. 2019

Metals

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Naturally exposed rusted rebar has been widely used for the production of reinforced concrete. However, rusted rebar is prone to corrosion under chloride ion (Cl−) contamination and/or at a low alkalinity of concrete. This study employed two surface modification methods, sand blasting and wire brushing, to augment the corrosion resistance of naturally exposed rusted rebar. Electrochemical tests revealed that the surface-modified rebar displayed a significant improvement of passivation in the concrete alkaline environment and anticorrosion performance in both the Cl− free and Cl−-containing simulated concrete pore solutions of different alkalinity. The enhanced performance was mainly due to the elimination of the rust layer and the direct exposure of the fresh metallic surface to the alkaline medium. Moreover, the effect of surface nanograins on the intensified passive film led to the best passivation performance of the wire-brushed rebar. The overall findings demonstrate that the two developed methods were conducive to the passivation and anticorrosion performance of the rusted rebar and thereby hold great promise for improving the service life of the reinforced concrete structures.

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Corrosion behavior of pre-rusted rebars after placement in concrete

Cited by 29 publications

References 1 publication

Initiation of chloride‐induced corrosion of steel in concrete: role of the interfacial zone

Initiation of chloride‐induced corrosion of steel in concrete: role of the interfacial zone

The effect of the steel–concrete interface on chloride-induced corrosion initiation in concrete: a critical review by RILEM TC 262-SCI

Surface Modification of Rusted Rebar and Enhanced Passivation/Anticorrosion Performance in Simulated Concrete Pore Solutions with Different Alkalinity

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