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Quantitative Evaluation on Decline Process of Performances of Concrete Structures

Research Project

Project/Area Number 09650511
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 土木材料・力学一般
Research InstitutionKagoshima University

Principal Investigator

TAKEWAKA Koji  Kagoshima University Faculty of Engineering Associate Professor, 工学部, 助教授 (10155054)

Project Period (FY) 1997 – 1998
Project Status Completed (Fiscal Year 1998)
Budget Amount *help
¥3,400,000 (Direct Cost: ¥3,400,000)
Fiscal Year 1998: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1997: ¥2,700,000 (Direct Cost: ¥2,700,000)
KeywordsConcrete Structure / Long-term Performance / Declination of Performance / Prediction of Deterioration / Chloride Attacked Environment / Hot Springs Environment / Defects Due to Inferior Construction / Computer Simulation for Deterioration Process / 複合劣化
Research Abstract

In this study, the influence of concrete deterioration and/or reinforcement corrosion on performances of concrete structure, such as bearing capacity, seismic capacity, fatigue property esthetics et al., was mainly examined, and the decline processes of these performances were quantified. The main results of this study are as follows ;
1. Development of computer simulation method for chloride induced reinforcement corrosion :
A computer simulation method for the chloride induced reinforcement corrosion in concrete has been developed in consideration of the effects of micro and macro pores in concrete, on the diffusion processes of chloride and oxygen. This method is useful for evaluating the influence of concrete quality, water content and crack existing in concrete on the corrosion process of reinforcing steel quantitatively.
2. Influence of the reinforcement corrosion on the fatigue property of concrete structure :
An equation predicting the decline of fatigue property of concrete struct … More ure due to reinforcement corrosion was proposed. In this equation, the pitting corrosion was introduced as a main factor causing the micro crack propagation into cross section of steel bar. Accuracy of the equation was confirmed by the fatigue test of reinforced concrete beams deteriorated due to the reinforcement corrosion.
3. Influence of defects built up by the inferior construction on the mechanical properties of concrete structures :
When some defects, such as honeycomb, large void and the irregular materials, exist in concrete due to the inferior construction, the mechanical properties of concrete structure would be affected by them. Some experimental study was done for clarifying the influences of the defects on the bearing capacity, toughness and fatigue property of reinforced concrete beams. From the results, it was confirmed that the fatigue property of the beams clearly declined on account of existing the defects in concrete even if no declination sign was appeared on the static bearing capacity.
4. Deterioration prediction of concrete under hot spring water :
Quantitative equations to predict the deterioration of concrete in the hot spring water were provided on the basis of analyzing the data obtained from the exposure tests under the several hot spring areas in Japan. Adequacy of the equations was checked by the results of the exposure test carried out newly in this study. Less

Report

(3 results)
  • 1998 Annual Research Report   Final Research Report Summary
  • 1997 Annual Research Report
  • Research Products

    (24 results)

All Other

All Publications (24 results)

  • [Publications] 北川啓一、武若耕司他: "既往研究結果を基にした温泉コンクリートの劣化要因分析" 平成9年度土木学会西部支部研究発表会講演概要集(その2). 878-879 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 中川隆享、武若耕司: "施工欠陥を有する鉄筋コンクリート梁の曲げ性状" 平成9年度土木学会西部支部研究発表会講演概要集(その2). 890-891 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 松武進太郎、若武耕司: "鉄筋コンクリート構造物の塩害評価に関するコンピュータシミュレーション" コンクリート工学年次論文報告集. Vol.20,No.1. 197-202 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 武若耕司: "鉄筋腐食により劣化したコンクリート構造物の曲げ疲労特性評価に関する一試み" 土木学会第53回年次学術講演会講演概要集「共通セッション」. 258-259 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 佐村有人、武若耕司他: "温泉環境下に暴露されたコンクリートの暴露2年間の調査結果" 平成10年度土木学会西部支部研究発表会講演概要集. 716-717 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 上原尚也、武若耕司他: "施行欠陥をもつ鉄筋コンクリート梁の曲げ疲労特性" 平成10年度土木学会西部支部研究発表会講演概要集. 746-747 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Takayuki SATO,Koji TAKEWAKA,et al.: "Experimental Study on Improvement of Durability for Concrete in Hot Spring Water" Proceedings of the Japan Concrete Institute. Vol.19, No.1. 998-990 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Yujin SAMURA,Koji TAKEWAKA,et al.: "Durability of Concrete Structures under Hot Springs Environment" Proceedings of Annual Meeting of Seibu Branch of the Japan Society of Civil Engineering. No.2. 876-877 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Keiichi KITAGAWA,Koji TAKEWAKA,et al.: "Multiple Regression Analysis of Deterioration Factors Affected on Concrete in Hot Spring Water" Proceedings of Annual Meeting of Seibu Branch of the Japan Society of Civil Engineering. No.2. 878-879 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Takayuki NAKAGAWA,Koji TAKEWAKA: "Bending Property of Reinforced Concrete Beam Having the Defects Due to Inferior Construction" Proceedings of Annual Meeting of Seibu Branch of the Japan Society of Civil Engineering. No.2. 890-891 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Shintaro MATSUTAKE,Koji TAKEWAKA: "Computer Simulation for the Estimation of Concrete Structure under Salt Attacks" Proceedings of the Japan Concrete Institute. Vol.20, No.1. 197-202 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Koji TAKEWAKA,Hidenori HAMADA,et al.: "Deterioration Mechanism and Rehabilitation on Concrete Structures" Concrete Journal. Vol.36, No.7. 6-10 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Koji TAKEWAKA: "A Trial for Estimation of Bending Fatigue Property of Reinforced Concrete Structure Deteriorated by Corrosion of Reinforcement" Proceedings of the 53^<th> Annual Con-ference of the Japan Society of Civil Engineering, Common Session. 258-259 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Yujin SAMURA,Koji TAKEWAKA,et al.: "Exposure Test Results of Concrete Specimens in Hot Spring Water for Two Years" Proceedings of Annual Meeting of Seibu Branch of the Japan Society of Civil Engineering. 716-717 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Naoya UEHARA,Koji TAKEWAKA,et al: "Bending Fatigue Property of Reinforced Concrete Beam Having the Defects Due to Inferior Construction" Proceedings of Annual Meeting of Seibu Branch of the Japan Society of Civil Engineering. 746-747 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 松武進太郎、武若耕司: "鉄筋コンクリート構造物の塩害評価に関するコンピュータシミュレーション" コンクリート工学年次論文報告集. Vol.20,No.1. 197-202 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 武若耕司: "劣化メカニズムとリハビリテーション" コンクリート工学. Vol.36,No.7. 6-10 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 武若耕司: "鉄筋腐食により劣化したコンクリート構造物の曲げ疲労特性評価に関する一試み" 土木学会第53回年次学術講演会講演概要集「共通セッション」. 258-259 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 佐村有人、武若耕司他: "温泉環境下に暴露されたコンクリートの暴露2年間の調査結果" 平成10年度土木学会西部支部研究発表会講演概要集. 716-717 (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] 上原尚也、武若耕司他: "施工欠陥をもつ鉄筋コンクリート梁の曲げ疲労特性" 平成10年度土木学会西部支部研究発表会講演概要集. 746-747 (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] 北川啓一、 武若耕司他: "既往研究結果を基にした温泉コンクリートの劣化要因分析" 平成9年度土木学会西部支部研究発表会講演概要集. (発表予定). (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] 佐村有人、 武若耕司他: "温泉環境下に暴露したコンクリートの劣化状況" 平成9年度土木学会西部支部研究発表会講演概要集. (発表予定). (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] 中川隆享、 武若耕司: "施工欠陥を有する鉄筋コンクリート梁の曲げ性状" 平成9年度土木学会西部支部研究発表会講演概要集. (発表予定). (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] 松武進太郎、 武若耕司: "鉄筋コンクリート構造物の塩害評価に関するコンピュータシミュレーション" コンクリート工学年次論文報告集. 第20巻(掲載予定). (1998)

    • Related Report
      1997 Annual Research Report

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Published: 1997-04-01   Modified: 2016-04-21  

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