Properties of concrete after 30 years' exposure under marine submerged condition

Hidenori Hamada, Tarek Uddin Mohammed, Toru Yamaji

研究成果: ジャーナルへの寄稿記事

抄録

A detailed investigation on 30-years old concrete specimens of 150mm in diameter and 300mm in height made with ordinary portland cement (OPC), high early strength portland cement (HES), moderate heat Portland cement (MH), slag cement of type B (SCB), and alumina cement (AL) was carried out. In each specimen, steel bars were embedded at cover depths of 20, 40, and 70mm. Mineralogy and microstructure of mortar portions at the inner and outer regions, coarse aggregate-mortar interface and steel-concrete interface were investigated. Carbonation depth, acid-soluble chloride contents, electro-chemical and corrosion condition of embedded steel bars were evaluated. It is concluded from the results that the microstructure of concrete at the outer region for SCB and AL becomes denser compared to the inner region. For AL, the inner region is relatively more porous and also a porous steel-concrete interface is found. Chloride ingress in concrete was lower for SCB and AL compared to OPC, HES and MH. However, more corrosion over the steel bars was found for AL. The surface condition of the steel bars embedded in concrete made with SCB remains as same as the initially polished condition. Utilization of SCB is concluded as one of the best choices to improve long-term durability of marine concrete structures.

元の言語英語
ページ(範囲)842-849
ページ数8
ジャーナルZairyo/Journal of the Society of Materials Science, Japan
54
発行部数8
DOI
出版物ステータス出版済み - 8 1 2005
外部発表Yes

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Slag cement
Steel
cements
Concretes
Portland cement
slags
steels
Mortar
Chlorides
Corrosion
Microstructure
Carbonation
Mineralogy
Aluminum Oxide
corrosion
Concrete construction
chlorides
Cements
Durability
Alumina

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

これを引用

Properties of concrete after 30 years' exposure under marine submerged condition. / Hamada, Hidenori; Mohammed, Tarek Uddin; Yamaji, Toru.

:: Zairyo/Journal of the Society of Materials Science, Japan, 巻 54, 番号 8, 01.08.2005, p. 842-849.

研究成果: ジャーナルへの寄稿記事

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