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Mechanism of degradation of concrete by salt scaling and its countermeasures

Research Project

Project/Area Number 17K06509
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 InstitutionIwate University

Principal Investigator

HANEHARA Shunsuke  岩手大学, 理工学部, 教授 (10400178)

Project Period (FY) 2017-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2018: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2017: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Keywordsコンクリート耐久性 / 凍害 / スケーリング / ソルトスケーリング / 劣化メカニズム / 凍害リスクマップ / スケーリング劣化 / スケーリング評価方法 / 凍結融解抵抗性 / 凍結防止剤 / スケーリング温度 / メカニズム / リスクマップ / 耐久性 / コンクリート / 凍結誘拐抵抗性 / 劣化現象 / 硬化体の劣化による性状変化
Outline of Final Research Achievements

I confirmed the usefulness of the small-piece freeze-thaw test, which allows simple and labor-saving testing of many levels. It was also shown that there is some consistency with existing scaling resistance evaluation test methods such as ASTM C672. I attempted to elucidate the mechanism of scaling deterioration and clarified that scaling occurs in the temperature range from -5℃ to -20℃, which is the eutectic point of salt water. I got a lot of new knowledge and results about the scaling mechanism. The effectiveness of hollow microsphere admixture was clarified as a method of improving durability. Based on the condition of scaling occurrence, based on the annual minimum temperature and the amount of anti-freezing agent sprayed, I proposed a new scaling deterioration risk area for road structures in Tohoku.

Academic Significance and Societal Importance of the Research Achievements

コンクリートのソフトスケーリングの試験方法として、小片凍結融解試験方法を提案し、ASTM C672等の既存の試験方法と間にある程度の整合性があることを示した。この試験方法を活用し、スケーリングが‐5℃から塩水の共晶点で ある-20℃の温度域で発生することを明らかにした。スケーリングのメカニズムに関する新しい知見を多くえた。耐久性を向上させる手 法として中空微小球混和材の有効性を明らかにした。スケーリングの発生条件に基づき、年間の最低気温及び凍結防止剤の散布量データをもとに、東北におけるスケーリング劣化危険地域を新たに提案した。これらは今後のコンクリートのスケーリング劣化対策の基礎技術となる。

Report

(4 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • 2017 Research-status Report
  • Research Products

    (16 results)

All 2020 2019 2018 2017

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

  • [Journal Article] INFLUENCE OF KIND OF DEICER AND TEMPERATURE DROP AND RISE BELOW LOW TEMPERATURE ON SALT SCLAING RESISTANCE OF MORTAR2020

    • Author(s)
      TANAKADATE Yuto、HANEHARA Shunsuke
    • Journal Title

      Cement Science and Concrete Technology

      Volume: 73 Issue: 1 Pages: 244-250

    • DOI

      10.14250/cement.73.244

    • NAID

      130007822479

    • ISSN
      0916-3182, 2187-3313
    • Year and Date
      2020-03-31
    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] INFLUENCE OF PRESSURIZATION AT FRESH ON SCALING RESISTANCE OF HARDENED MORTAR2019

    • Author(s)
      田中舘 悠登, 羽原 俊祐, 小山田 哲也, 五十嵐 数馬
    • Journal Title

      Cement Science and Concrete Technology

      Volume: 72 Issue: 1 Pages: 233-239

    • DOI

      10.14250/cement.72.233

    • NAID

      130007626858

    • ISSN
      0916-3182, 2187-3313
    • Year and Date
      2019-03-29
    • Related Report
      2019 Annual Research Report 2018 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] INFLUENCE OF REPETITION OF TEMPERATURE DROP AND RISE BELOW FREEZING POINT ON SALT SCALING RESISTANCE OF MORTAR2019

    • Author(s)
      田中舘 悠登, 羽原 俊祐
    • Journal Title

      Cement Science and Concrete Technology

      Volume: 72 Issue: 1 Pages: 240-246

    • DOI

      10.14250/cement.72.240

    • NAID

      130007626856

    • ISSN
      0916-3182, 2187-3313
    • Year and Date
      2019-03-29
    • Related Report
      2019 Annual Research Report 2018 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] 小片凍結融解試験法による高炉スラグ細骨材(BFS)のソルトスケーリング抵抗性の評価2018

    • Author(s)
      田中舘悠登, 羽原俊祐, 湊 俊顕, 山本 英和
    • Journal Title

      コンクリート工学年次論文集

      Volume: 40 Pages: 807-812

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] スケーリング劣化に及ぼす気泡径分布の影響とその 原因2018

    • Author(s)
      樊小義, 小山田哲也, 羽原俊祐
    • Journal Title

      コンクリート工学年次論文集

      Volume: 40 Pages: 777-782

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] フレッシュ時に外部からの圧力が硬化コンクリートの気泡組織およびスケーリング抵抗性に及ぼす影響2017

    • Author(s)
      田中舘悠登、羽原俊祐、小山田哲也、林大介
    • Journal Title

      コンクリート工学年次論文集

      Volume: 39 Pages: 793-798

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Journal Article] スケーリング劣化に及ぼすコンクリート表面に発生する応力の影響2017

    • Author(s)
      樊小義, 小山田哲也, 羽原俊祐
    • Journal Title

      コンクリート工学年次論文集

      Volume: 39 Pages: 835-840

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Journal Article] 凍結融解抵抗性,硫酸塩抵抗性および硫酸抵抗性に及ぼす高炉スラグ細骨材の影響2017

    • Author(s)
      中村大樹、山本英和、羽原俊祐、小山田哲也、田中舘悠登、
    • Journal Title

      Journal of MMIJ

      Volume: 7 Pages: 151-156

    • NAID

      130006899209

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Journal Article] 中空微小球を添加したコンクリートのスケーリング抵抗性に及ぼす 練混ぜ時間の影響2017

    • Author(s)
      田中舘悠登, 羽原俊祐, 小山田哲也, 五十嵐数馬
    • Journal Title

      セメント・コンクリート論文集

      Volume: 71 Pages: 373-378

    • NAID

      130006588463

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Presentation] Mechanism of Deterioration of Concrete by Salt Scaling2019

    • Author(s)
      Shunsuke Hanehara, Yuto Tanakadate, Tetsuya Oyamada,
    • Organizer
      15th International Congress on the Chemistry of Cement, Prague, Czech Republich,
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Influence of pressure to fresh concrete on air content and air void system in concrete2019

    • Author(s)
      Yuto Tanakadate, Shunsuke Hanehara, Tetsuya Oyamada
    • Organizer
      15th International Congress on the Chemistry of Cement, Prague, Czech Republich,
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Research on Mechanism of Deterioration of Concrete by Salt Scaling by use of New Evaluation Method, International Symposium on Inorganic and Environmental Materials2018

    • Author(s)
      Shunsuke HANEHARA, Yuto TANAKADATE and Tetsuya OYAMADA,
    • Organizer
      (ISIEM 2018), STRUCT-IL1, Gent(Belgium), June 17-21, 2018
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] 圧送および振動締固めがコンクリートのス ケーリング抵抗性に及ぼす影響2018

    • Author(s)
      平戸 謙好,小山田 哲也,田中舘 悠登
    • Organizer
      平成30年度土木学会全国大会講演概要集
    • Related Report
      2018 Research-status Report
  • [Presentation] コンクリートのスケーリング抵抗性に及ぼす表面含浸材の影響2018

    • Author(s)
      小山田 哲也,皆川 翔平,羽原 俊祐
    • Organizer
      平成30年度土木学会全国大会講演概要集
    • Related Report
      2018 Research-status Report
  • [Presentation] EXPERIMENTAL STUDY OF ENTRAINED AIR IN CONCRETE2017

    • Author(s)
      Y. Tanakadate, S. Hanehara, T. Oyamada, K. Igarashi,
    • Organizer
      International Scientic Symposium, The future of cement 200 years after Louis Vicat, UNESCO, Paris,
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Protection to the salt scaling of the concrete for tunnel lining under severe cold climate2017

    • Author(s)
      Tetsuya OYAMADA, Shunsuke HANEHARA
    • Organizer
      The 9th International Symposium on Cement and Concrete, Wuhan China
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research / Invited

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Published: 2017-04-28   Modified: 2022-12-28  

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