30年間常時海水中に暴露されたコンクリートの諸性質について  [in Japanese] Properties of Concrete after 30 years' Exposure under Marine Submerged Condition  [in Japanese]

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Abstract

A detailed investigation on 30-years old concrete specimens of 150 mm in diameter and 300 mm 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 70 mm. 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.

Journal

  • Journal of the Society of Materials Science, Japan

    Journal of the Society of Materials Science, Japan 54(8), 842-849, 2005-08-15

    The Society of Materials Science, Japan

References:  7

Cited by:  3

Codes

  • NII Article ID (NAID)
    110006266587
  • NII NACSIS-CAT ID (NCID)
    AN00096175
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    05145163
  • NDL Article ID
    7453560
  • NDL Source Classification
    ZM16(科学技術--科学技術一般--工業材料・材料試験)
  • NDL Call No.
    Z14-267
  • Data Source
    CJP  CJPref  NDL  NII-ELS  J-STAGE 
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