Development of micro and meso scale densification and expansion model of cementitious material damaged by sulfuric acid solution

• Project/Area Number: 26820177
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Civil engineering materials/Construction/Construction management
• Research Institution: Nagoya University
• Principal Investigator: Miura Taito 名古屋大学, 工学研究科, 助教 (10718688)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Project Status: Completed (Fiscal Year 2016)
• Budget Amount: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000); Fiscal Year 2016: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000); Fiscal Year 2015: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2014: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
• Keywords: 硫酸塩劣化 / 剛体バネモデル / 反応－拡散方程式 / 水和反応モデル / 膨張ひび割れ / エトリンガイト / 二水セッコウ / 硫酸塩劣化予測解析 / 拡散 / 硫酸による劣化 / 有限体積法 / RBSM / メソレベル / 物理化学的性質 / 力学的性質

Outline of Final Research Achievements

Experimental investigation: The influence of confinement pressure during making gypsum to mechanical behavior and density of gypsum was investigated to evaluate mechanical behavior of gypsum in pore solution. As a result, it was found that mechanical behavior of gypsum was strongly related to confinement pressure during making gypsum.
Analytical investigation: The analytical model that can reconstruct transformation of solid-liquid phase and manifestation and propagation of expansion cracking behaviors due to sulfate attack was proposed. It was confirmed that the proposed model can describe the signature cracking behavior due to sulfate attack.

Research Products

• [Journal Article] 外部硫酸塩劣化による膨張ひび割れ進展挙動に関する解析的検討 (2016)
  • Author(s): 三浦泰人，山本佳士，中村光
  • 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: 16 Pages: 323-328
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] 析出物の影響を考慮した硫酸による劣化予測解析による劣化領域の評価 (2015)
  • Author(s): 三浦泰人，佐藤靖彦，中村光
  • 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: 15 Pages: 83-88
  • Peer Reviewed / Acknowledgement Compliant
• [Presentation] Fundamental study of crack propagation of external sulfate attack with mesoscale analysis system for coupled chemo-mechanical behaviors (2016)
  • Author(s): Taito Miura, Yamamoto Yoshihito, Hikaru Nakamura
  • Organizer: 9th International Conference on Fracture Mechanics of Concrete and Concrete Structures
  • Place of Presentation: California
  • Year and Date: 2016-05-30
  • Int'l Joint Research
• [Presentation] FUNDAMENTAL STUDY OF CRACK PROPAGATION OF EXTERNAL SULFATE ATTACK WITH MESOSCALE ANALYSIS SYSTEM FOR COUPLED CHEMO-MECHANICAL BEHAVIOURS (2016)
  • Author(s): Taito Miura, Yoshihito Yamamoto, Hikaru Nakamura
  • Organizer: 9th International Conference on Fracture Mechanics of Concrete and Concrete Structures
  • Place of Presentation: California
  • Year and Date: 2016-05-29
  • Int'l Joint Research
• [Remarks] 名古屋大学 材料形態学グループ コンクリート研究室
  • URL: http://concrete-lab.civil.nagoya-u.ac.jp/homepage/j/