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Corrosion factors of underground steel considering reaction/transportation of substances and proposal of countermeasure for the corrosion protection

Research Project

Project/Area Number 20K04657
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 22010:Civil engineering material, execution and construction management-related
Research InstitutionShizuoka Institute of Science and Technology (2022)
National Institute of Maritime, Port and Aviation Technology (2020-2021)

Principal Investigator

Nishida Takahiro  静岡理工科大学, 理工学部, 教授 (10345358)

Co-Investigator(Kenkyū-buntansha) 河合 慶有  愛媛大学, 理工学研究科(工学系), 准教授 (90725631)
Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2022: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2021: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2020: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Keywords鋼材腐食 / 土中 / 抑制方法 / アノード / カソード / 酸素低減 / 反応 / 物質移動 / 腐食対策
Outline of Research at the Start

一般に,土中では,陸上や海中と比較して腐食の進行が遅いが,容易に点検・検査が難く,長期間放置しておくと甚大な被害が生じる.一方で,近年,地中構造物の需要は増加の一途をたどっている.本研究では(a)遊具や道路標識などの支柱,(b)無電中化などで埋設される電線類や管路,さらには,(c)放射性廃棄物の地層処分に使用される鋼材などを対象とし,土中の鋼材腐食対策方法の確立に成果の反映を図る.以下に目的を示す.
目的(1) 土中での鋼材腐食の進行速度に及ぼす要因の抽出
目的(2) 目的(1)で抽出された要因を踏まえた腐食の対策方法の確立

Outline of Final Research Achievements

In this study, electrochemical parameters such as polarisation resistance and natural potential of steel buried in soil were measured through exposure tests. As a result, it was confirmed that the corrosion rate increased once in the early stage of exposure and then decreased. However, in the case of sand, no significant increase in corrosion rate was observed when the steel was installed at the bottom. These results suggest that the corrosion of steel in soil is strongly influenced by oxygen and that corrosion can be reduced by reducing oxygen. In particular, steel in clay tends to develop macrocell corrosion due to changes in oxygen permeability, and this study investigated techniques to prevent localised corrosion of underground steel and found the use of oxygen reducing agents to be effective.

Academic Significance and Societal Importance of the Research Achievements

本研究では,種々のパラメータを勘案し,カソード反応がアノード反応に及ぼす影響を考慮し,酸素や水の土中での移動速度を関連付けて評価した.また,コンクリート中鋼材を対象として,内部の酸素低減による鉄筋腐食の抑制について検討を進めており,工業副産物や微生物に基づいた技術の特許申請をしている.本研究ではこれらの知見を応用し,酸素低減可能な材料を散布することにより土中の酸素量を低減することを試みた.このような検討はこれまで見当たらず,この点が本研究の独創性である.

Report

(4 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (9 results)

All 2022 2021

All Journal Article (7 results) (of which Int'l Joint Research: 3 results,  Peer Reviewed: 4 results) Presentation (2 results)

  • [Journal Article] カソード分極試験における鋼材周囲の酸素濃度の変動と律速条件の関係2022

    • Author(s)
      平城清志, 河合慶有, 西田孝弘, 氏家勲
    • Journal Title

      コンクリート構造物の補修,補強,アップグレード論文報告集

      Volume: 22 Pages: 25-28

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Activation Energies of Chloride Induced Corrosion of Steel in Concrete2022

    • Author(s)
      Takahiro Nishida, Keiyu Kawaai, Nobuaki Otsuki
    • Journal Title

      Proceedings of GEOMATE 2022

      Volume: 12 Pages: 378-383

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Corrosion of underground Steel between Soil and Clay and Its Prevention2022

    • Author(s)
      Keiyu Kawaai, Takahiro Nishida
    • Journal Title

      Proceedings of GEOMATE 2022

      Volume: 12 Pages: 276-279

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Reduction of Dissolved Oxygen in Minimizing Corrosion2022

    • Author(s)
      Mary Grace Ventanilla, Jason Ongpeng, Takahiro Nishida, Keiyu Kawaai
    • Journal Title

      Acta Polytechnica CTU Proceedings

      Volume: 33 Pages: 624-630

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] 鋼材腐食抑制のための酸素低減型混和材の開発2021

    • Author(s)
      西田孝弘,河合慶有,齋藤淳,大即信明
    • Journal Title

      コンクリート構造物の補修,補強,アップグレード論文報告集

      Volume: 21 Pages: 41-46

    • NAID

      40022764603

    • Related Report
      2021 Research-status Report
  • [Journal Article] 約25年供用された鋼管杭の重防食端部における腐食性状の調査2021

    • Author(s)
      西田孝弘,山路徹,加藤絵万,佐々木秀郎
    • Journal Title

      土木学会念学術講演会概要集

      Volume: 76

    • Related Report
      2021 Research-status Report
  • [Journal Article] 54年間供用された土中鋼構造物の腐食性状の調査2021

    • Author(s)
      西田孝弘,山路徹
    • Journal Title

      第41回防錆防食技術発表大会講演予稿集

      Volume: 41 Pages: 151-152

    • Related Report
      2021 Research-status Report
  • [Presentation] 約25年供用された鋼管杭の重防食端部における腐食性状の調査2021

    • Author(s)
      西田孝弘
    • Organizer
      土木学会念学術講演会
    • Related Report
      2021 Research-status Report
  • [Presentation] 54年間供用された土中鋼構造物の腐食性状の調査2021

    • Author(s)
      西田孝弘
    • Organizer
      第41回防錆防食技術発表大会
    • Related Report
      2021 Research-status Report

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Published: 2020-04-28   Modified: 2024-01-30  

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