Corrosion of Steel Bars in Cracked Concrete under Marine Environment
Publication: Journal of Materials in Civil Engineering
Volume 15, Issue 5
Abstract
This paper deals with the macrocell and microcell corrosion of steel bars in cracked concrete exposed to a marine environment. For this, short-term accelerated laboratory and long-term exposure tests were carried out. Test items include electrochemical and physical evaluations of corrosion, chloride ion content in concrete, and oxygen permeability through concrete. Analyses by scanning electron microscopy and electron probe microanalyzer were also carried out to confirm the deposit in the healed cracks. For an unhealed crack, the portion of the steel bar located at the root of the crack acts as an anode and other portions as a cathode. Also, microcell corrosion at the cracked region is higher than the uncracked region. Macrocell corrosion process and the degree of macro and microcell corrosion are significantly influenced by the water/cement. In a natural marine environment, narrower cracks heal due to the deposition of ettringite, calcite, and brucite in the crack. This reduces the corrosion rate significantly at the cracked region.
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References
American Concrete Institute (ACI). (1996). “Corrosion of metals in Concrete.” Reported by ACI Committee 222, ACI 222-96, Detroit.
Andrade, C., and Alonso, C. (2000). “On-site measurements of corrosion rate of reinforcements.” Proc., Special Technical Session on Near Surface Testing for Strength and Durability of Concrete at 5th CANMET/ACI Int. Conf. on Durability of Concrete, P. A. M. Basheer, ed., Barcelona, Spain, 171–182.
Arya, C., and Ofori-Darko, F. K.(1996). “Influence of crack frequency on reinforcement corrosion in concrete.” Cem. Concr. Res., 26(3), 345–353.
Brown, R. D.(1980). “Mechanism of corrosion of steel in concrete in relation to design, inspection and repair of offshore and coastal structures.” ACI SP, 65, 169–204.
Edvardsen, C.(1999). “Water permeability and autogenous healing of cracks in concrete.” ACI Mater. J., 96(4), 448–454.
Fontana, M. G., and Greene, N. D. (1983). Corrosion engineering, 2nd Ed., McGraw-Hill, New York.
Mehta, P. K. (1991). Concrete in the marine environment, Elsevier Applied Science, London.
Mohammed, T. U., Otsuki, N., Hamada, H., and Toru, Y.(2002). “Chloride-induced corrosion of steel bars in concrete with the presence of gap at the steel-concrete interface.” ACI Mater. J., 99(2), 149–156.
Mohammed, T. U., Otsuki, N., and Hisada, M.(1999). “Corrosion of steel bars with respect to orientation in concrete.” ACI Mater. J., 96(2), 154–159.
Mohammed, T. U., Otsuki, N., Hisada, M., and Tsunenori, S.(2001a). “Effect of crack width and bar types on corrosion of steel in concrete.” Mater. Civ. Eng., 13(3), 194–201.
Mohammed, T. U., Yamaji, T., Toshiyuki, A., and Hamada, H.(2001b). “Corrosion of steel bars in cracked concrete made with ordinary portland, slag and fly ash cements.” ACI SP, 199(2), 699–718.
Nagataki, S., Otsuki, N., Hisada, M., and Miyazato, S.(1996). “The experimental study on corrosion mechanism of reinforced concrete at local repair part.” Proc., JSCE, 544(32), 109–119.
Schiessl, P., and Raupach, M.(1997). “Laboratory studies and calculations on the influence of crack width on chloride-induced corrosion of steel in concrete.” ACI Mater. J., 94(1), 56–62.
Tsuru, T., Maeda, R., and Haruyama, S.(1979). “Application of A-C corrosion monitor to localized corrosion.” Corr. Eng. Tech. Rep., Jpn. Soc. Corr. Eng., 28(12), 638–644.
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Information
Published In
Journal of Materials in Civil Engineering
Volume 15 • Issue 5 • October 2003
Pages: 460 - 469
Copyright
Copyright © 2003 American Society of Civil Engineers.
History
Received: Jun 15, 2001
Accepted: Dec 6, 2002
Published online: Sep 15, 2003
Published in print: Oct 2003
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