Corrosion of steel bars in cracked concrete under marine environment

Tarek Uddin Mohammed, Nobuaki Otsuki, Hidenori Hamada

研究成果: ジャーナルへの寄稿記事

40 引用 (Scopus)

抄録

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.

元の言語英語
ページ(範囲)460-469
ページ数10
ジャーナルJournal of Materials in Civil Engineering
15
発行部数5
DOI
出版物ステータス出版済み - 9 1 2003

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Steel
Concretes
Corrosion
Cracks
Magnesium Hydroxide
Calcium Carbonate
Calcite
Corrosion rate
Macros
Chlorides
Anodes
Cements
Cathodes
Deposits
Ions
Oxygen
Scanning electron microscopy
Electrons
Water

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Building and Construction
  • Materials Science(all)
  • Mechanics of Materials

これを引用

Corrosion of steel bars in cracked concrete under marine environment. / Mohammed, Tarek Uddin; Otsuki, Nobuaki; Hamada, Hidenori.

:: Journal of Materials in Civil Engineering, 巻 15, 番号 5, 01.09.2003, p. 460-469.

研究成果: ジャーナルへの寄稿記事

Mohammed, Tarek Uddin ; Otsuki, Nobuaki ; Hamada, Hidenori. / Corrosion of steel bars in cracked concrete under marine environment. :: Journal of Materials in Civil Engineering. 2003 ; 巻 15, 番号 5. pp. 460-469.
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