Corrosion mechanism of hot-dip galvanised reinforcement bar in cracked concrete

Sistonen, Esko; Ćwirzeń, Andrzej; Puttonen, Jari

doi:10.1016/j.corsci.2008.08.050

Cited by 46 publications

(22 citation statements)

References 13 publications

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“…Galvanised steel has a critical chloride concentration 2 to 3 times higher than that for carbon steel, and since corrosion products are less voluminous than carbon steel then concrete is also less likely to crack (Williamson et al 2009). The corrosion rate for galvanised steel is also reduced by approximately 40% (Sistonen et al 2008).…”

Section: Chloride-induced Corrosionmentioning

confidence: 80%

“…On the other hand, there is little quantitative information about the performance of galvanised steel in carbonated concrete. Sistonen et al (2008) found that corrosion rate of galvanised steel did not change in carbonated concrete when compared to carbon steel. However, Bentur et al (1997) observed that corrosion rate increased in noncarbonated concrete, but then decreased when concrete was carbonated.…”

Section: Carbonation-induced Corrosionmentioning

confidence: 97%

“…The protective film which surrounds stainless steel is stable at alkaline to neutral environments, and so stainless steel will not corrode in carbonated concrete (Nurnberger 2005, Sistonen et al 2008. On the other hand, there is little quantitative information about the performance of galvanised steel in carbonated concrete.…”

Section: Carbonation-induced Corrosionmentioning

confidence: 99%

“…Stainless steel is an effective adaptation measure, with Williamson et al (2009) suggesting that the critical chloride concentration is 10 to 50 times higher than that for carbon steel. Corrosion rate is observed to be reduced by a factor of 50 (Gu et al 1996, Sistonen et al 2008. Galvanised steel has a critical chloride concentration 2 to 3 times higher than that for carbon steel, and since corrosion products are less voluminous than carbon steel then concrete is also less likely to crack (Williamson et al 2009).…”

Section: Chloride-induced Corrosionmentioning

confidence: 99%

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Climate change adaptation for corrosion control of concrete infrastructure

2012

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Section: Chloride-induced Corrosionmentioning

confidence: 80%

Section: Carbonation-induced Corrosionmentioning

confidence: 97%

Section: Carbonation-induced Corrosionmentioning

confidence: 99%

Section: Chloride-induced Corrosionmentioning

confidence: 99%

See 2 more Smart Citations

Climate change adaptation for corrosion control of concrete infrastructure

2012

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“…This bond does not only depend on the surrounding matrix, but also the reinforcement geometry (Sistonen et al, 2001 [3] ; El Zareef and Schlaich, 2008 [4] ; Desnerck and De Schutter, 2010 [5] ; Farghal Maree and Hilal Riad, 2014 [6] ). Bond mechanisms include chemical adhesion, friction and mechanical interlock.…”

Section: Introductionmentioning

confidence: 99%

Fracture of lightweight foamed concrete in evaluation of bond behaviour of steel reinforcement embedded in LWFC

Villiers¹,

Zijl²,

Rooyen³

2016

Proceedings of the 9th International Conference on Fracture Mechanics of Concrete and Concrete Structures

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Abstract:Low weight, self-levelling, high workability and thermal insulating properties make lightweight foamed concrete (LWFC) an attractive substitute for normal weight concrete (NWC). The unfamiliarity of LWFC and paucity of design guidance pose concern for its use in structural application. One such concern is the bonding of steel reinforcement within LWFC. The bond behaviour of deformed steel reinforcement (rebar), embedded in LWFC and NWC was tested using pull-out (PO) and the beam-end (BE) tests [1] . The concretes used for testing were a reference NWC and LWFC with casting densities of 1200, 1400 and 1600 kg/m 3 . The nominal diameters of rebar used were Y10, Y12 and Y20 at embedded lengths of 3, 4 and 5 nominal bar diameters. Characterization of these materials included compressive strength, Young's modulus, tensile splitting strength and wedge splitting fracture energy.The bond-slip envelopes of the denser LWFC yield significant bond stress magnitudes, but lack the ductility in failure observed in the NWC tests. The least dense LWFC exhibits ductility during failure, but lacks sufficient bonding stress magnitude. A significant difference in bond behaviour is observed between the results of the PO tests and the BE tests. The interaction of LWFC fracture and rebar bond mechanisms in the BE tests in the presence of shear and bending moment, is the direct cause, and the relatively low fracture toughness leads to low apparent bond resistance. Through this understanding, material improvement is envisaged by inclusion of aggregate to increase cracking tortuosity and thereby fracture energy of LWFC, in order to improve rebar bond in LWFC.

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Bond of deformed steel reinforcement in lightweight foamed concrete

2017

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Low weight and thermal insulating properties make lightweight foamed concrete (LWFC) an attractive substitute for normal‐weight concrete (NWC). The unfamiliarity and paucity of design guidance challenge the structural use of LWFC. One concern is the bond of steel reinforcement in LWFC. This paper presents the results of pull‐out bond tests and beam‐end bond tests. The parameters were a reference NWC and LWFC with densities of 1,200, 1,400, and 1,600 kg/m3 and rebar diameters of 10, 12, and 20 mm with embedded lengths of 3, 4, and 5 bar diameters. All concretes were characterized in terms of strength, stiffness, and fracture energy. Clear differences in bond resistance were found from the two tests. The bond in LWFC is lower than that in NWC. The results suggest that the development of LWFC materials to increase fracture energy has the potential to increase the bond.

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Corrosion mechanism of hot-dip galvanised reinforcement bar in cracked concrete

Cited by 46 publications

References 13 publications

Climate change adaptation for corrosion control of concrete infrastructure

Climate change adaptation for corrosion control of concrete infrastructure

Fracture of lightweight foamed concrete in evaluation of bond behaviour of steel reinforcement embedded in LWFC

Bond of deformed steel reinforcement in lightweight foamed concrete

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