Development of evaluation system of environmental action for precise prediction of long-term serviceability of concrete structures

• Project/Area Number: 25289131
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Civil engineering materials/Construction/Construction management
• Research Institution: Nagaoka University of Technology
• Principal Investigator: Shimomura Takumi 長岡技術科学大学, 工学(系)研究科(研究院), 教授 (40242002)
• Co-Investigator(Kenkyū-buntansha): TANAKA Yasushi 東京大学, 生産技術研究所, 特任准教授 (40377221) ; NAKAMURA Fuminori 長岡技術科学大学, 工学部, 助教 (70707786)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Project Status: Completed (Fiscal Year 2015)
• Budget Amount: ¥16,250,000 (Direct Cost: ¥12,500,000、Indirect Cost: ¥3,750,000); Fiscal Year 2015: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000); Fiscal Year 2014: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000); Fiscal Year 2013: ¥10,270,000 (Direct Cost: ¥7,900,000、Indirect Cost: ¥2,370,000)
• Keywords: コンクリート構造物 / 環境作用 / 降雨 / 日射 / 乾漆繰り返し / 毛細管吸水 / 乾燥収縮 / クリープ / コンクリートの乾湿挙動 / 飛来塩分 / 表面塩分 / 数値シミュレーション / コンクリート / 維持管理 / 耐久性 / 水分移動 / 表面温度 / 塩害 / 結露 / 潮解

Outline of Final Research Achievements

This study dealt with development of general procedure to generate input data for mass transport and time-dependent stress analysis of concrete structures based on evaluation and modeling of environmental attack on structures. It was experimentally clarified that drying and wetting behavior of actual concrete structure is affected by not only mean value of atmospheric temperature and humidity but also their time-dependent change and solar radiation and rainfall. Coupling analysis of heat and moisture was proposed to take into account the effect of solar radiation on moisture transfer adequately. Method of modeling of drying and wetting pattern was proposed to express effect of rainfall. Procedure of long term behavior of structures in the future using public meteorological data near the objective structure provided by Japan Meteorology Agency was developed. Their adequateness was verified by the conducted exposure test and sensitivity analysis.

Research Products

• [Journal Article] 屋外暴露されたRC・PC 部材の時間依存性変形に及ぼす環境作用の影響 (2016)
  • Author(s): 志賀 暢，阿部 哲雄，渡部 雅貴，下村 匠
  • Journal Title: コンクリート工学年次論文集 Volume: 38
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] 外部環境条件の時系列変化が実構造物の塩分浸透量に与える影響に関する研究 (2016)
  • Author(s): 中村 文則，下村 匠，原田 健二，大原 涼平
  • Journal Title: コンクリート工学年次論文集 Volume: 38
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] 数値シミュレーションを援用した構造物各部位の到達塩分量の予測手法 (2015)
  • Author(s): 中村文則，下村 匠，生田麻実，細山田得三
  • Journal Title: コンクリート工学年次論文集 Volume: 37 Pages: 775-780
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] 屋外一般環境下におけるコンクリート構造物中の含水状態の長期変動解析法の高精度化 (2014)
  • Author(s): 女屋賢人，下村 匠，Thynn Thynn HTUT
  • Journal Title: コンクリート工学年次論文集 Volume: 36 Pages: 760-765
  • Peer Reviewed
• [Journal Article] 飛来塩分が到達するコンクリートの表面塩分量に関する現地観測と数値解析 (2014)
  • Author(s): 中村文則，生田麻実，下村 匠，細山田得三
  • Journal Title: コンクリート工学年次論文集 Volume: 36 Pages: 880-885
  • Peer Reviewed
• [Journal Article] 構造物表面における水の流動に伴う塩分の輸送とコンクリート中への侵入に関する統合解析 (2014)
  • Author(s): 原田健二，佐藤駿介，下村 匠
  • Journal Title: コンクリート工学年次論文集 Volume: 36 Pages: 910-915
  • Peer Reviewed
• [Journal Article] コンクリート構造物の表面における塩分の移動と停留メカニズムの検討 (2014)
  • Author(s): 原田健二，下村 匠
  • Journal Title: 第23回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: 23 Pages: 477-480
  • Peer Reviewed
• [Journal Article] Evaluation of InFluence of Flexural Crack on Chloride Ingress Into Concrete in RC member by Numerical Simulation (2014)
  • Author(s): Nguyen Thi Hien and Takumi Shimomura
  • Journal Title: コンクリート構造物の補修，補強、アップグレード論文報告集 Volume: 14 Pages: 221-226
  • Peer Reviewed
• [Journal Article] 構造物表面における水の流動に伴う塩分の輸送とコンクリート中への侵入に関する統合解析 (2014)
  • Author(s): 原田 健二，佐藤 駿介，下村 匠
  • Journal Title: コンクリート工学年次論文集 Volume: 36 Pages: 1-6
  • Peer Reviewed
• [Journal Article] 屋外一般環境下におけるコンクリート構造物中の含水状態の長期変動解析法の高精度化 (2014)
  • Author(s): 女屋 賢人，下村 匠，Thynn Thynn Htut
  • Journal Title: コンクリート工学年次論文集 Volume: 36 Pages: 1-6
  • Peer Reviewed
• [Presentation] Simulation of Long-Term Stress and Deflection of Concrete Structures Based on Precise Considerations of Environmental Action (2015)
  • Author(s): T.Shimomura
  • Organizer: the 10th International Conference on Mechanics and Physics of Creep, Shrinkage, and Durability of Concrete and Concrete Structures (CONCREEP 10)
  • Place of Presentation: Wien, Austria
  • Year and Date: 2015-09-21
  • Int'l Joint Research
• [Presentation] Universal Moisture Transport Model in Concrete under Natural Environment (2015)
  • Author(s): T.Shimomura
  • Organizer: the 5th International Conference on Construction Materials (Conmat '15)
  • Place of Presentation: Whistler, Canada
  • Year and Date: 2015-08-16
  • Int'l Joint Research
• [Presentation] Numerical Simulation of Spatial Distribution and Progress of Penetration of Chloride into Concrete Structure Due to De-icing Agent (2014)
  • Author(s): K. Harada
  • Organizer: the 4th International Symposium on Technology for Sustainability
  • Place of Presentation: National Taipei University of Technology
  • Year and Date: 2014-11-19 – 2014-11-21
• [Presentation] コンクリート橋脚表面における排水管からの漏水痕の数値シミュレーション (2014)
  • Author(s): 佐藤駿介
  • Organizer: 第32回土木学会新潟会研究調査発表会
  • Place of Presentation: ハイブ長岡
  • Year and Date: 2014-11-05
• [Presentation] 塩分による蒸気圧降下がコンクリートの乾湿挙動に及ぼす影響の検討 (2014)
  • Author(s): 原田健二
  • Organizer: 土木学会第69回年次学術講演会
  • Place of Presentation: 大阪大学
  • Year and Date: 2014-09-10 – 2014-09-12
• [Presentation] Modelling of environmental action for simulation of long term variation of moisture content in concrete structures (2014)
  • Author(s): T. Shimomura
  • Organizer: the 1st International Conference on Aging of Materials and Structures
  • Place of Presentation: Delft University of Technology
  • Year and Date: 2014-05-26 – 2014-05-28
• [Presentation] Modelling of Environmental Action for Simulation of Long Term Variation of Moisture Content in Concrete Structures (2014)
  • Author(s): Takumi Shimomura
  • Organizer: The International Conference on Ageing of Materials & Structures (AMS'14)
  • Place of Presentation: Delft, The Netherlands
• [Presentation] 塩分による蒸気圧降下がコンクリートの乾湿挙動に及ぼす影響の検討 (2014)
  • Author(s): 原田健二
  • Organizer: 土木学会全国大会年次学術講演会
  • Place of Presentation: 大阪