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Basic Study on Cathodic Protection for Repairing of Prestressed-Concrete Structures Damaged by Chloride Corrosion of Reinforcement

Research Project

Project/Area Number 03650394
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 InstitutionKagoshima University

Principal Investigator

TAKEWAKA Koji  Kagoshima Univ., Faculty of Eng., Associate Prof., 工学部, 助教授 (10155054)

Project Period (FY) 1991 – 1992
Project Status Completed (Fiscal Year 1992)
Budget Amount *help
¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 1992: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1991: ¥1,300,000 (Direct Cost: ¥1,300,000)
KeywordsPrestressed-Concrete Structures / Cathodic Protection / Corrosion of Reinforcement / Repairing Method / 100mV Shifting Criterion / Over-Protection Problem / Field Examination of Repairing / Permanent Form with Anode / コンクリート構造物 / 防食基準 / 施工実験 / 陽極システム / 永久型枠 / プレストレストコンクリ-ト構造物 / 水素脆化
Research Abstract

Cathodic protection is expected to be a practical corrosion protection system for newly and repaired concrete structures in marine environment. In this study, some laboratory and field examinations were carried out for the establishment of high reliability on the cathodic protection for repairing prestressed-concrete structures. The following results were obtained :
(1) -100mV shifting criterion for cathodic protection can not be accomplished satisfactorily for corrosion protection of reinforcements in concrete. 150-200mV depolarization may be necessary to stop the corrosion in severe corrosion environment such as atmospheric dry and wet cyclic condition in marine environment.
(2) In the case of cathodic protection on prestressed-concrete structures, the possibility of reduction of strength of prestressed-concrete strand is found at over-protection-level current density, and cracking of concrete may also occur at that current density level, due to the high pressure of hydrogen evolution. Therefore, it is necessary that cathodic protection should not be over-protected absolutely on pretension type prestressed-concrete structures, regardless of condition of concrete and surrounding atmosphere.
(3) From the field examination of repairing the reinforced-concrete garage by the cathodic protection, it is confirmed that the cathodic protection can be useful on concrete structures affected by drying for relatively long time. And even polish condition of reinforcement is influenced by the repairing effect of cathodic protection of corroded concrete structures.
(4) The permanent form with anode of cathodic protection on concrete structures is developed, as the anode system construction is simplified and its durability is enhanced.

Report

(3 results)
  • 1992 Annual Research Report   Final Research Report Summary
  • 1991 Annual Research Report
  • Research Products

    (22 results)

All Other

All Publications (22 results)

  • [Publications] 武若 耕司: "コンクリート構造物の塩害対策における電気防食の適用性に関する研究" コンクリート工学年次論文報告集. 第13巻. 573-578 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] K.Takewaka: "A Cathodic Protection System for Rehabilitation of Marine Concrete Structures" DURABILITY OF CONCRETE,ACI. SP-126. 657-678 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] 馬庭 秀士: "PC構造物に対する電気防食法の適用性に関する実験的検討" 土木学会第46回年次学術講演会. 第5巻. 360-361 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] 武若 耕司: "コンクリート構造物における電気防食法の現状" コンクリート工学. 第30巻. 16-27 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] 馬庭 秀士: "コンクリート構造物における電気防食の効果に関する実験的検討" 土木学会第47回年次学術講演会. 第5巻. 422-423 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] 武若 耕司: "中性化により鉄筋腐食を起こしたRC製ガレージへの電気防食の適用実験について" 平成4年度土木学会西部支部研究発表会. 790-791 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] K.Takewaka: "Cathodic Protection for Reinforced-Concrete and Prestressed-Concrete Structures" Corrosion Science. (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] 峰松 敏和: "コンクリート中の鋼材の電気防食に及ぼす各種要因の影響" コンクリート工学年次論文報告集. 第15巻. (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] 武若 耕司: "電気防食用陽極として使用できる永久型枠の開発について" 土木学会第48回年次学術講演会. (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] K. Takewaka: "Applicability of Cathodic Protection to Reinforced and Prestressed Concrete Structures" Proceedings of JCI. Vol. 13, No. 1. 573-578 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] K. Tatewaka: "Cathodic Protection System for Rehabilitation of Marine Concrete Structures" ACI SP-126. Vol. 1. 657-678 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] H. Maniwa: "Experimental Study on cathodic Protection for Prestressed concrete structures" Proceedings of 46th Annual Conf. of JSCE. Vol. 5. 360-361 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] K. Takewaka: "Cathodic Protection of Reinforcing Steel in Concrete Structures" Concrete Journal. Vol. 30 No. 8. 16-27 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] H. Maniwa: "Experimental Study on the Effect of Cathodic Protection for Concrete Structures" Proceedings of 47th Annual Conf. of JSCE. Vol. 5. 422-423 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] K. Takewaka: "Field examination of Repairing for Reinforced Concrete Garage by Cathodic Protection" Proceedings of Annual Meeting of Seibu Branch of JSCE. 790-791 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] K. Takewaka: "Cathodic Protection for Reinforced-Concrete and Prestressed-Concrete Structures" Corrosion Science. (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] T. Minematu: "Analysis on Effects of Cathodic Protection on Steel in Concrete" Proceedings of JCI. (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] K. Takewaka: "Development of GRC Permanent Form with Anode Material for Cathodic Protection on Concrete Structures" Proceedings of 48th Annual Conf. of JSCE. (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] 馬庭 秀士、武若 耕司: "コンクリート構造物における電気防食の効果に関する実験的検討" 土木学会第47回年次学術講演会講演概要集. 第V巻. 422-423 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] 武若 耕司 他: "中性化により鉄筋腐食を起こしたRC製ガレージへの電気防食の適用実験について" 平成4年度土木学会西部支部研究発表会講演概要集. 790-791 (1993)

    • Related Report
      1992 Annual Research Report
  • [Publications] Kohji Takewaka: "CATHODIC PROTECTION FOR REINFORCED-CONCRETE AND PRESTRESSED-CONCRETE STRUCTURES" CORROSION SCIENCE. (1993)

    • Related Report
      1992 Annual Research Report
  • [Publications] Koji TAKEWAKA: "Cathodic Protection for Reinforced Concrete and Prestressed Concrete Structures" International Conference on Advances in Corrosion and Protection. (1992)

    • Related Report
      1991 Annual Research Report

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Published: 1991-04-01   Modified: 2016-04-21  

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