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Study on mechanism of local damage formation of concrete subjected to seawater attack

Research Project

Project/Area Number 16K06456
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Civil engineering materials/Construction/Construction management
Research InstitutionNational Institute of Maritime, Port and Aviation Technology

Principal Investigator

Yamaji Toru  国立研究開発法人海上・港湾・航空技術研究所, 港湾空港技術研究所, 領域長 (10371767)

Research Collaborator Kawabata Yuichiro  
Ogawa Shoichi  
Yoshida Natsuki  
Project Period (FY) 2016-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2018: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2017: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2016: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Keywordsコンクリート / 海水 / 劣化 / ひび割れ / 耐久性 / 海水劣化 / 熱力学的相平衡計算
Outline of Final Research Achievements

This study investigated the mechanism of damage of concrete due to seawater attack. Also, the prediction method as well as accelerated testing method were investigated. As the result, the cause of seawater deterioration may be repetition of dissolution and precipitation of ettringite accompanying change of temperature and concentration of pore water. For prediction, simplified model for S penetration depth and Mg penetration depth was developed. Finally, wetting and drying test using seawater for cement paste with small diameter was proposed for accelerated test.

Academic Significance and Societal Importance of the Research Achievements

本研究はこれまで着目されていなかったコンクリートの海水劣化に着目し,そのメカニズムを明らかにした点で学術的意義が高いと考える。また,海水劣化の予測法を提案したことで劣化予測が可能になり,また促進試験の活用により各種材料の海水劣化抵抗性を評価することが可能になり,コンクリート構造物の長寿命化等に貢献できる点は社会的にも意義が大きい。

Report

(4 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • 2016 Research-status Report
  • Research Products

    (6 results)

All 2018 2017

All Journal Article (5 results) (of which Peer Reviewed: 3 results,  Open Access: 2 results) Presentation (1 results)

  • [Journal Article] A Study on Local Cracking of Concrete Subjected to Seawater2018

    • Author(s)
      K. Yonamine, T. Yamaji, and Y. Kawabata
    • Journal Title

      Procedings of the 8th International Conference of Asian Concrete Federation

      Volume: - Pages: 587-594

    • Related Report
      2018 Annual Research Report
  • [Journal Article] Long-term Behavior of Various Elements in Concrete under Marine Environments2018

    • Author(s)
      T. Yamaji, K. Yonamine and Y. Kawabata
    • Journal Title

      Procedings of the 3rd International Symposium on Concrete and Structures for Next Generation

      Volume: - Pages: 205-212

    • Related Report
      2018 Annual Research Report
  • [Journal Article] STUDY ON PUMPABILITY AND DURABILITY OF CORAL AGGREGATE CONCRETE2017

    • Author(s)
      山路徹,与那嶺一秀,川端雄一郎
    • Journal Title

      Cement Science and Concrete Technology

      Volume: 71 Issue: 1 Pages: 394-401

    • DOI

      10.14250/cement.71.394

    • NAID

      130006588465

    • ISSN
      0916-3182, 2187-3313
    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] A STUDY ON LOCAL CRACKING OF CONCRETE EXPOSED TO SEAWATER2017

    • Author(s)
      与那嶺一秀,山路徹,川端雄一郎
    • Journal Title

      Cement Science and Concrete Technology

      Volume: 71 Issue: 1 Pages: 425-431

    • DOI

      10.14250/cement.71.425

    • NAID

      130006588479

    • ISSN
      0916-3182, 2187-3313
    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] 熱帯(サバナ気候)環境下において長期間暴露されたサンゴ骨材を用いたコンクリートの諸特性2017

    • Author(s)
      山路徹
    • Journal Title

      コンクリート工学

      Volume: 7

    • NAID

      130007387023

    • Related Report
      2016 Research-status Report
    • Peer Reviewed
  • [Presentation] 長期海洋暴露試験に基づく高炉スラグ微粉末の置換率 を変化させたコンクリートの塩分浸透性に関する検討2017

    • Author(s)
      与那嶺一秀,山路徹,審良善和
    • Organizer
      第44回土木学会関東支部技術研究発表会
    • Place of Presentation
      埼玉大学
    • Year and Date
      2017-03-07
    • Related Report
      2016 Research-status Report

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Published: 2016-04-21   Modified: 2020-03-30  

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