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Assessment of Residual Life of Coastal Concrete Structures

Research Project

Project/Area Number 63850106
Research Category

Grant-in-Aid for Developmental Scientific Research

Allocation TypeSingle-year Grants
Research Field コンクリート工学・土木材料・施工
Research InstitutionHokkaido University

Principal Investigator

FUJITA Yoshio  Fac. of Engineering, Hokkaido University, Professor, 工学部, 教授 (10001067)

Co-Investigator(Kenkyū-buntansha) TAKADA Nobuyuki  Fac. of Engineering, Hokkaido University, Instructor, 工学部, 助手 (30001225)
SAEKI Noboru  Fac. of Engineering, Hokkaido University, Associate Professor, 工学部, 助教授 (80002004)
Project Period (FY) 1988 – 1989
Project Status Completed (Fiscal Year 1989)
Budget Amount *help
¥3,700,000 (Direct Cost: ¥3,700,000)
Fiscal Year 1989: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1988: ¥3,000,000 (Direct Cost: ¥3,000,000)
KeywordsReinforced Concrete / Corrosion / Salt Damage / Chlorine Ion / Neutralization / Cover Thickness / Fatigue Test / Residual Life / コンクリート構造物 / 縦ひびわれ / 疲労強度
Research Abstract

This paper describes the assessment and control of life for coastal concrete structures to maintain the security and improvement for infrastructure. Based on the accelerated test for corrosion,surveying field and fatigue test,the following results may be drawn.
The cracking index may be applied to control rust damage in the concrete structures. It is found that the allowable stress for reinforcing bars corresponds to the cover thickness and the high quality of the tensile strain of the concrete cover is effective in preventing corrosion.
In a severe corrosive environment,the rust damage occurs rarely if the stress in reinforcing bars is less than (36C+8)MPa (C is the cover thickness in cm).
Similarly in an ordinary corrosive environment,the concrete is not susceptible to rust damage if the stress is less than (56C+8)MPa.
The fatigue strength and number of reinforced concrete beans with longitudinal crack due to rust damage are obtained and the residual life of reinforced concrete beams damaged by corrosion is estimated.

Report

(3 results)
  • 1989 Annual Research Report   Final Research Report Summary
  • 1988 Annual Research Report
  • Research Products

    (9 results)

All Other

All Publications (9 results)

  • [Publications] N.Saeki: "Control of Rust Damage of Reinforced Concrete in a Corrosive Environment" Concrete in Marine Environment Pro. 2nd International Conference, ACI. Sp-109. 163-177 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] 佐伯昇: "鉄筋腐食による縦ひびわれを有するRC桁の疲労耐力" 土木学会年次学術講演会概要集. 45. (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] 高田宣之: "沿岸コンクリ-トの塩分濃度と中性化" 土木学会年次学術講演会概要集. 45. (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] N.Saeki: "Control of Rust Damage of Reinforced Concrete in a Corrosive Environment" American Concrete Institute, Sp-109, pp.163-177, 1988.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] N.Saeki: "Fatigue Resistance of Reinforced Concrete beams with Longitudinal Crack due to Rust Damage" Proceedings of the 45th Annual Conference of the Japan Society of Civil Engineers, 5, 1990.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] T.Takada: "Chlorine Ion Density and Neutralization of Coastal Concrete Structures" Proceedings of the 45th Annual Conference of the Japan Society of Civil Engineers, 5, 1990.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] 佐伯昇: "鉄筋腐食による縦ひびわれを有するRC桁の疲労耐力" 土木学会年次学術講演会概要集. 45. (1990)

    • Related Report
      1989 Annual Research Report
  • [Publications] 高田宣之: "沿岸コンクリ-トの塩分濃度と中性化" 土木学会年次学術講演会概要集. 45. (1990)

    • Related Report
      1989 Annual Research Report
  • [Publications] 佐伯昇: 土木学会年次学術講会概要集. 44. (1989)

    • Related Report
      1988 Annual Research Report

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Published: 1988-04-01   Modified: 2016-04-21  

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