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Quantitative Examination of Appearance of Cement Concrete Based on Logistic Regression and the Development

Research Project

Project/Area Number 18K13872
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 23010:Building structures and materials-related
Research InstitutionThe University of Kitakyushu

Principal Investigator

Suyama Hiroki  北九州市立大学, 国際環境工学部, 准教授 (20507876)

Project Period (FY) 2018-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Fiscal Year 2020: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2019: ¥390,000 (Direct Cost: ¥300,000、Indirect Cost: ¥90,000)
Fiscal Year 2018: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Keywordsコンクリート / 印象評価 / 不具合 / 表面気泡 / ひび割れ / コールドジョイント / アンケート調査 / ロジスティック回帰分析 / 建築材料 / 木材 / 感性評価 / 因子分析 / 重回帰分析 / 外観 / 汚れ / ロジスティック回帰
Outline of Final Research Achievements

In this study, I investigated bug holes, cracks and cold joint as typical defect of bare concrete. Using an evaluation survey and statistical analysis I identified factors affecting people’s evaluations of the appearance of concrete based on defects and thereby attempted to determine management standards for appearance.
When evaluators observed defects on concrete specimens, the bug hole area ratio and the crack width for which half evaluators responded with “I’m bothered by the defect on the surface” was found to be 0.30%/ 0.17 mm for women and 0.53%/ 0.19 mm for women. When evaluators observed defects on concrete buildings, the crack width for which 10% evaluators responded with “Repair is necessary” was found to be 0.31 mm.

Academic Significance and Societal Importance of the Research Achievements

打放しコンクリートに生じる不具合事象の外観に関する既往の知見は、ひび割れを除き、現場の経験則を根拠としたものが殆どであり、その多くが定性的な表現にとどまる。外観上許容される不具合事象の限界値は、殆ど提案されていない。経済的かつ効率的にコンクリート工事を実施するための課題として、統計的根拠に基づいたコンクリートの外観上の許容値を示すことが必要といえる。
コンクリートのみならず、建築材料の外観が消費者の心理に与える影響を検討した研究報告は限定的である。本研究の調査・分析手法は、木系仕上げや漆喰仕上げなどの他の仕上げ工法の外観評価にも応用できると考えられる。

Report

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

    (7 results)

All 2020 2019

All Presentation (7 results) (of which Int'l Joint Research: 3 results)

  • [Presentation] Impression evaluation to bug holes on concrete surface and a proposal for the management standards2020

    • Author(s)
      Suyama Hiroki, Takasu Koji and Koyamada Hidehiro
    • Organizer
      Advances in Construction Materials Proceedings of the Conmat'20
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 木材の特性と印象と造作材としての用途選択の関係に関する調査2020

    • Author(s)
      陶山裕樹, 高巣幸二, 小山田英弘
    • Organizer
      日本建築学会大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] コンクリートに生じるコールドジョイントが心象に与える影響の評価2020

    • Author(s)
      三谷洋介, 陶山裕樹, 高巣幸二, 小山田英弘
    • Organizer
      日本建築学会九州支部研究報告
    • Related Report
      2019 Research-status Report
  • [Presentation] Impression evaluation to bug holes on concrete surface and a proposal for the management standards2020

    • Author(s)
      Suyama Hiroki, Takasu Koji, and Koyamada Hidehiro
    • Organizer
      ConMat'20 6th International Conference on Construction Materials
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] 打放しコンクリートに生じる表面気泡の外観上の許容値に関する検討2019

    • Author(s)
      三谷洋介,陶山裕樹,高巣幸二,小山田英弘
    • Organizer
      2018年度第58回日本建築学会九州支部研究発表会
    • Related Report
      2018 Research-status Report
  • [Presentation] 表面気泡が生じたコンクリートの外観に関するロジスティック回帰を用いた検討2019

    • Author(s)
      三谷洋介,陶山裕樹,高巣幸二,小山田英弘
    • Organizer
      2019年度日本建築学会大会(北陸)
    • Related Report
      2018 Research-status Report
  • [Presentation] Consideration on Appearance Limitations of Fly Ash Blended within Concrete2019

    • Author(s)
      Yosuke Mitani1, Koji Takasu, Hidehiro Koyamada and Hiroki Suyama
    • Organizer
      5th International Conference on Sustainable Construction Materials and Technologies (SCMT5)
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research

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

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