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A survey on the macro-cell corrosion in structures and a study on its mechanism

Research Project

Project/Area Number 01550375
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field コンクリート工学・土木材料・施工
Research InstitutionTokyo Institute of Technology

Principal Investigator

OTSUKI Nobuaki  T. I. T. Dept. of Civil Engineering Associate Prof., 工学部, 助教授 (40211106)

Co-Investigator(Kenkyū-buntansha) OHGA Hiroyuki  Univ. of Tokyo, Institute of Industrial Science, Assistant, 生産技術研究所, 助手 (40152061)
MIKI Chitoshi  T. I. T. Dept. of Civil Engineering Prof., 工学部, 教授 (20016645)
NAGATAKI Shigeyoshi  T. I. T. Dept. of Civil Engineering Prof., 工学部, 教授 (00016320)
井上 毅  東京工業大学, 工学部, 教務職員 (10184756)
岡本 亨久  東京工業大学, 工学部, 助手 (50093737)
Project Period (FY) 1989 – 1990
Project Status Completed (Fiscal Year 1991)
Budget Amount *help
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1990: ¥200,000 (Direct Cost: ¥200,000)
Fiscal Year 1989: ¥1,900,000 (Direct Cost: ¥1,900,000)
KeywordsStructures / Maxro-cell / Steel structures at Port / RC Structures / Composite structure / Crack / Joint / Repaired part / 局部的腐食 / 鉄筋コンクリ-ト構造物 / 鋼構造物 / ハイブリッド構造物
Research Abstract

To clarify the influence of the macro-cell corrosion in structures, investigations on (1) conditions of damaged structures, (2) macro-cell in underground structures, and (3) macro-cell in RC structures, were done.
For item (1), the damages in steel structures at port, RC structures and composite structures were surveyed. Also, the possibility of severe macro-cell corrosion in massive RC structures and composite structures were shown.
For item (2), experiments about the macro-cell in long underground structures were done. Comparing the influence of macro-cell and that of micro-cell, there was almost no possibility of severe macro-cell in the axial direction of structures.
For item (3), the influences of cracks, joints, repair methods and admixtures for concrete were experimentally studied. The results show, (1) Without crack, blast furnace slag powder and silicafume powder were effective against corrosion, however, with cracks, the effects reduced especially with axially directed crack, also the areas of reinforcement exposed to cracks tended to be anodes. (2) Joints and cracks caused macro-cell corrosion and the areas of reinforcement exposed to them were usually to be anodic, however, sometimes they can be cathodic. (3) The repaired areas tended to be cathodic and the joints between repaired and unrepaired part could be anodes and the corrosion rate could be very fast.

Report

(3 results)
  • 1991 Final Research Report Summary
  • 1990 Annual Research Report
  • 1989 Annual Research Report
  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] 大即 信明,長滝 重義,ウィ・ティオン・ホアン,中下 兼次: "セメント硬化体中における塩素イオンの存在形態および鉄筋の電気化的性質" コンクリ-ト工学年次論文報告集. 12. 425-428 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 大即 信明,池上 明夫,福手 勤,高木 兼士: "種々の材料の鉄筋の防食性能についての電気化学的評価" コンクリ-ト工学論文集. 1. 1-13 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 大即 信明,中下 兼次,長滝 重義: "塩分環境下におけるセメント硬化体中の鋼材腐食に及ぼす混和材の影響" セメントコンクリ-ト論文集. 45. 538-543 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 大即 信明: "コンクリ-トのひびわれと耐久性" 土木学会第5回新しい材料・工法・機械講習概要集. 1-4 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 大即 信明,久田 真: "RCの打継目およびひびわれが鉄筋のマクロセルにおよぼす影響に関する考察" セメント・コンクリ-ト研究討論会論文報告集. 18. 77-84 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] N. Otsuki, S. Nagataki, T. W. Wee: "Presence of choloride ion in cementitious matrix and its influence on the etectrochemical properties on embedded steel bars" Proceedings of the Japan Concrete Institute. 12. 425-428 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] N. Otsuki, A. Ikegami, T. Fukute, K. Takagi: "Electrochemical evaluation of embedded steel bars in the various materials" Concrete Research and Technology, Japan Concrete Institute. 1, No. 2. 1-14 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] N. Otsuki, K. Nakashita, S. Nagataki: "Influence of admixtures on the corrosion of embedded steel bars in hardened cementitious matrix materials" Proceeding of cement & concrete, Cement Association of Japan. No. 45. 538-543 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] N. Otsuki, M. Hisada: "Influence of joints and cracks on the macro cell corrosion of embedded bars in RC members" Proceedings of the 18th JUCC Congress on cement and concrete. 77-84 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 大即 信明,長瀧 重義,Tiong Huan Wee,中下 兼次: "セメント硬化体中における塩素イオンの存在形態および鉄筋の電気化学的性質" コンクリ-ト工学年次論文報告集. 12巻. 425-428 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] 大即 信明,中下 兼次,長瀧 重義: "塩分環境下におけるセメント硬化体中の鋼材腐食に及ぼす混和材の影響" セメント・コンクリ-ト論文集. 45. (1991)

    • Related Report
      1990 Annual Research Report
  • [Publications] 長瀧重義,大即信明,ウィ- ティオン ホアン: "Condensation and Binding of Intruded Chloride Ion in Hardened cement Matrix Materials" 土木学会論文報告集. 414. 42-53 (1990)

    • Related Report
      1989 Annual Research Report

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Published: 1989-04-01   Modified: 2016-04-21  

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