| Project/Area Number |
18360206
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Civil engineering materials/Construction/Construction management
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
OTSUKI Nobuaki Tokyo Institute of Technology, Graduate School of Engineering, Professor (40211106)
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| Co-Investigator(Kenkyū-buntansha) |
NIWA Jyunichiro Tokyo Institute of Technology, Graduate School of Engineering, Professor (60164638)
SAITO Tsuyoshi Tokyo Institute of Technology, Graduate School of Engineering, Assistant Professor (90452010)
MIKI Tomohiro Kobe Universiy, Graduate School of Engineering, Assistant Professor (30401540)
西田 孝弘 東京工業大学, 大学院理工学研究科, 助手 (10345358)
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| Project Period (FY) |
2006 – 2007
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| Project Status |
Completed (Fiscal Year 2007)
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| Budget Amount *help |
¥16,400,000 (Direct Cost: ¥15,500,000、Indirect Cost: ¥900,000)
Fiscal Year 2007: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2006: ¥12,500,000 (Direct Cost: ¥12,500,000)
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| Keywords | Reinforced concrete / Temperature / Deterioration / Arrhenius equation / Activation energy / Corrosion speed of steel bar / Ion permeability rate / Durability |
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| Research Abstract |
(1) It was confirmed that the corrosion rate of steel bars in concrete increased with the temperature rising. And it was confirmed that the deterioration of reinforced concrete due to the steel corrosion apparently agreed with the Arrhenius theory.
(2) In addition, it became possible to construct the ionic migration system in the concrete which considers the influence of temperature by in ionic migration system (Nernst - to designate Planck system as basic system, ionic migration system which considers Debye-Huckel system which expresses influence of coexistence ion and electrical neutrality condition for judging entire ionic migration) in the concrete which is the research result of the applicant Arrenius system adding.
(3) According to the results, the life time of reinforced concrete exponentially decreased with the temperature of the city increasing. Especially, it was indicated that the environment against steel corrosion in concrete from the viewpoint of temperature effect. The life time of reinforced concrete in South-East Asia became 70% of that in mild temperature environment (20℃).
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