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Establishment of judgement method of spalling risk of concrete cover due to rebar corrosion

Research Project

Project/Area Number 18H01510
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 22010:Civil engineering material, execution and construction management-related
Research InstitutionNagoya University

Principal Investigator

NAKAMURA HIKARU  名古屋大学, 工学研究科, 教授 (60242616)

Co-Investigator(Kenkyū-buntansha) 三浦 泰人  名古屋大学, 工学研究科, 准教授 (10718688)
山本 佳士  名古屋大学, 工学研究科, 准教授 (70532802)
Project Period (FY) 2018-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥16,510,000 (Direct Cost: ¥12,700,000、Indirect Cost: ¥3,810,000)
Fiscal Year 2020: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2019: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2018: ¥9,360,000 (Direct Cost: ¥7,200,000、Indirect Cost: ¥2,160,000)
Keywordsかぶり剥落 / 鉄筋腐食 / 内部ひび割れ / 鉄筋かぶり / 剥離強度 / 環境作用 / 非破壊試験 / 剛体バネモデル / 腐食ひび割れ / コンクリート剥落 / 温度履歴 / はく離強度 / コンクリート片剥離 / 非破壊検査 / コンクリート片剥落強度試験 / ひび割れ幅変化 / 剥落危険度 / 打音法 / 電磁波レーダ法
Outline of Final Research Achievements

In order to determine the risk level of spalling of concrete pieces, the detection of internal cracks related to spalling, the action and the spalling strength to drive the spalling behavior from internal cracks were investigated.
As a result, an evaluation method using electromagnetic radar waveform was developed as a non-destructive inspection method to identify the internal cracks. Regarding the action to drive the spalling, it was found that the effect of temperature change was significant and caused the same level of internal crack width change as that of spalling under load. In addition, the experimental and numerical methods to evaluate the spalling strength were developed, and it was clarified that the remaining cover was the most significant factor to influence the spalling strength.

Academic Significance and Societal Importance of the Research Achievements

コンクリート構造物の維持管理で、コンクリート片の剥落は人命などを失うような事故につながる可能性もあり、最も避けなければいけない事象である。そのため、コンクリート構造物の点検では、打音検査による剥落に関係する内部欠陥の把握とその危険性の評価に多くの労力がさかれている。
本研究で内部欠陥を客観的手法により特定する手法の開発や、コンクリート剥落リスクを高める要因が温度変化や残存かぶりの大きさであることを明らかにしたことは、現在の点検の合理性・客観性・有効性を高めることに寄与するとともに、コンクリート構造物から生じる第三者影響度を低減し、インフラの信頼性を高めることに寄与する。

Report

(4 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Annual Research Report
  • 2018 Annual Research Report
  • Research Products

    (15 results)

All 2020 2019 2018

All Journal Article (9 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 9 results,  Open Access: 7 results) Presentation (6 results) (of which Int'l Joint Research: 5 results,  Invited: 2 results)

  • [Journal Article] STUDY ON DETECTION OF INTERNAL CRACK AND REBAR CORROSION AREA BY ELECTROMAGNETIC WAVE RADAR DATA USING SELF-ORGANIZING MAP2020

    • Author(s)
      多田 祐希, 三浦 泰人, 中村 光
    • Journal Title

      Journal of Japan Society of Civil Engineers, Ser. E2 (Materials and Concrete Structures)

      Volume: 76 Issue: 3 Pages: 158-170

    • DOI

      10.2208/jscejmcs.76.3_158

    • NAID

      130007878459

    • ISSN
      2185-6567
    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] 鉄筋腐食の軸方向分布と表面ひび割れ幅関係の解析的検討2019

    • Author(s)
      木山直道、中村光、Zahra Amalia、三浦泰人
    • Journal Title

      コンクリート工学年次論文集

      Volume: 41 Pages: 953-958

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] 軸方向腐食分布およびかぶりの違いが腐食ひび割れ挙動に及ぼす影響評価2019

    • Author(s)
      木山直道、中村光、三浦泰人、山本佳士
    • Journal Title

      プレストレストコンクリートの発展に関するシンポジウム論文集

      Volume: 28 Pages: 145-150

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] 鉄筋腐食によるコンクリート片の剥離強度評価解析手法の構築2019

    • Author(s)
      大島直樹、中村光、三浦泰人、山本佳士
    • Journal Title

      プレストレストコンクリートの発展に関するシンポジウム論文集

      Volume: 28 Pages: 151-156

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Effect of corrosion‐induced crack and corroded rebar shape on bond behavior2019

    • Author(s)
      Yang Yizhou、Nakamura Hikaru、Miura Taito、Yamamoto Yoshihito
    • Journal Title

      Structural Concrete

      Volume: 20 Issue: 6 Pages: 1-12

    • DOI

      10.1002/suco.201800313

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] 打音機構を搭載した飛行ロボットによる橋梁点検の適用性評価2019

    • Author(s)
      三浦泰人、新田益大、和田秀樹、中村光
    • Journal Title

      構造工学論文集

      Volume: 65A Pages: 607-614

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Development of simulation method of concrete cracking behavior and corrosion products movement due to rebar corrosion2018

    • Author(s)
      Amalia Zahra、Qiao Di、Nakamura Hikaru、Miura Taito、Yamamoto Yoshihito
    • Journal Title

      Construction and Building Materials

      Volume: 190 Pages: 560-572

    • DOI

      10.1016/j.conbuildmat.2018.09.100

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] 弾性波法による健全部判定に基づくコンクリートおよび断面修復部内部の欠陥検出2018

    • Author(s)
      鈴木理絵、多田祐希、中村光、三浦泰人
    • Journal Title

      コンクリート工学年次論文集

      Volume: 40 Pages: 1617-1622

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] 自己組織化マップを用いた電磁波伝搬特性での内部ひび割れの検出に関する研究2018

    • Author(s)
      多田祐希、中村光、三浦泰人
    • Journal Title

      コンクリート工学年次論文集

      Volume: 40 Pages: 1671-1676

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] Effect of external load and temperature change on delamination behavior and internal crack development2020

    • Author(s)
      Lingyu Su, Hikaru Nakamura, Naoki Oshima, Taito Miura
    • Organizer
      JSCE 23rd Intgernational Summer Symposium
    • Related Report
      2020 Annual Research Report
  • [Presentation] Simulation of degradation of bond stress and slip relationship with corrosion induced crack2019

    • Author(s)
      Hikaru Nakamura
    • Organizer
      6th fib Symposium
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Evaluation of corrosion area of rebar and corrosion-induced crack by using electro-magnetic wave radar2019

    • Author(s)
      Hikaru Nakamaura
    • Organizer
      19th ASEP International Convention
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Crack propagation due to rebar corrosion and nondestructive test to detect the crack2018

    • Author(s)
      Hikaru Nakamaura
    • Organizer
      Concrete and Steel Technology, Engineering and Design
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Development of simulation method for crack propagation and corrosion product movement due to rebar corrosion2018

    • Author(s)
      Hikaru Nakamaura
    • Organizer
      6th European Conference on Computational Mechanics
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Numerical Study on the Concrete cover spalling strength and spalling Area due to rebar corrosion2018

    • Author(s)
      Naoki Oshima
    • Organizer
      8th International Conference of Asian Concrete Federation
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research

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Published: 2018-04-23   Modified: 2022-01-27  

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