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Effectiveness of nylon fiber recycled from fishing net as a repair material to restore structural capacity

Research Project

Project/Area Number 17H03293
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Structural engineering/Earthquake engineering/Maintenance management engineering
Research InstitutionHokkaido University

Principal Investigator

YOKOTA Hiroshi  北海道大学, 工学研究院, 教授 (50344312)

Project Period (FY) 2017-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥9,620,000 (Direct Cost: ¥7,400,000、Indirect Cost: ¥2,220,000)
Fiscal Year 2019: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Fiscal Year 2018: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Fiscal Year 2017: ¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Keywords廃棄漁網 / リサイクル / ナイロン繊維 / コンクリート構造物 / 補強材料 / 性能回復 / 力学性能 / 耐久性 / 補修材料
Outline of Final Research Achievements

This research program focused on the effectiveness of recycled nylon fiber from used fishing nets as a reinforcing material of concrete and mortar. The addition of fiber results in the decrease in compressive strength of concrete because of fiber's low Young's modulus. The reduction in strength is observed to be lower with higher fiber fraction and longer fibers. The addition of fiber affords a more ductile mode of failure, which leads to an increase in the load carrying capacity of fiber reinforced mortar. In the experiment, #-shape shows high effectiveness because it enhances flexural performance of mortar. Durability against free-thaw repetitions and chloride ion invasion are enhanced by adding the fiber. The experimental results confirmed that recycled nylon fiber has the potential for effectively reinforcing concrete and mortar and would be a possible way to recycle them, which can realize sustainability in the world.

Academic Significance and Societal Importance of the Research Achievements

素材自体の力学性能が他の一般的な有機繊維と比較して十分ではないリサイクルナイロン繊維をコンクリート補修・補強材として用い、特にコンクリートの引張性能や耐久性を向上できる可能性が示されたことで、今後さらなる研究や実用化に向けた検討および技術開発が期待できる。このことは、有害物質を発生させるため焼却処分が難しいとされる廃棄漁網を回収してリサイクルするための選択肢を増やすこととつながり、海洋生物や海洋環境に与える悪影響を低減させ、地球環境の保全や温暖化の防止にも意義がある。

Report

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

    (8 results)

All 2020 2019 2018 2017

All Presentation (8 results) (of which Int'l Joint Research: 4 results,  Invited: 1 results)

  • [Presentation] リサイクルナイロン短繊維補強モルタルの耐凍害性評価2020

    • Author(s)
      松浦 悠、横田 弘
    • Organizer
      土木学会北海道支部 令和元年度年次技術研究発表会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Mechanical properties of polymer cement mortar reinforced with polyethylene and recycled nylon fibers2019

    • Author(s)
      Teeranai Srimahachota, Haruka Matsuura, Hiroshi Yokota
    • Organizer
      3rd ACF Symposium, Assessment and Intervention of Existing Structures
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Recycling of waste fishing net as short fibers to reinforce cement mortar2019

    • Author(s)
      Hiroshi Yokota, Teeranai Srimahachota, Haruka Matsuura, Shun Yamaguchi
    • Organizer
      International Conference on Building Materials (ICBM 2019) on Science and Technology of Building Materials for Sustainable Development
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Mechanical properties of mortar reinforced with recycled nylon fiber from waste fishing nets2019

    • Author(s)
      Teeranai Srimahachota, Haruka Matsuura, Hiroshi Yokota
    • Organizer
      16th East Asia-Pacific Conference on Structural Engineering and Construction (EASEC16)
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] リサイクルナイロン短繊維補強モルタルの力学性能評価(発表確定)2019

    • Author(s)
      松浦 悠、横田 弘
    • Organizer
      土木学会第74回年次学術講演会
    • Related Report
      2018 Annual Research Report
  • [Presentation] 様々な形状を有するリサイクルナイロン繊維で補強したモルタルの力学性能(発表確定)2019

    • Author(s)
      山口 駿,横田 弘
    • Organizer
      土木学会第74回年次学術講演会
    • Related Report
      2018 Annual Research Report
  • [Presentation] リサイクルナイロン繊維のモルタル補強効果に関する検討2018

    • Author(s)
      海野太貴、横田 弘
    • Organizer
      平成29年度土木学会北海道支部年次技術研究発表会
    • Related Report
      2017 Annual Research Report
  • [Presentation] Applicability of recycled-nylon fiber polymer cement mortar to the section repair of deteriorated RC beams2017

    • Author(s)
      Shayna Orasutthikul, Daiki Unno, Hiroshi Yokota
    • Organizer
      8th Asia and Pacific Young Researchers and Graduates Symposium, YRGS 2017
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research

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Published: 2017-04-28   Modified: 2021-02-19  

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