| Project/Area Number |
17360203
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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 | Nagaoka University of Technology |
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Principal Investigator |
SHIMOMURA Takumi Nagaoka University of Technology, Faculty of Engineering, Associate Professor, 工学部, 助教授 (40242002)
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| Co-Investigator(Kenkyū-buntansha) |
TANAKA Yasushi Nagaoka University of Technology, Faculty of Engineering, Research Associate, 工学部, 助手 (40377221)
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| Project Period (FY) |
2005 – 2006
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| Project Status |
Completed (Fiscal Year 2006)
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| Budget Amount *help |
¥12,000,000 (Direct Cost: ¥12,000,000)
Fiscal Year 2006: ¥2,400,000 (Direct Cost: ¥2,400,000)
Fiscal Year 2005: ¥9,600,000 (Direct Cost: ¥9,600,000)
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| Keywords | airborne salt / numerical simulation / surface chloride / surface coating / micropore structure / chloride attack / reinforcement corrosion / diffusion / 表面保護工法 / 気象条件 / 海象条件 |
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| Research Abstract |
1) Airborne salt reaching on the surfaces of concrete structures could be successfully predicted by numerical transport analysis in which configuration of structure, geography around structure, weather condition and ocean condition are considered.
2) It was shown that averaged airborne salt in the time scale of week can be estimated by the numerical analysis in which averaged weather and ocean conditions are considered.
3) It was clarified by field measurement that airborne salt reaching on the surface of structures is less than that blown in the air.
4) The investigators developed a simple experimental system that simulates the developing process of surface chlorides of concrete subjected by rain and sunshine in the laboratory
5) Since diffusion coefficient of chloride ions in surface coating materials for concrete is very small, defects and deterioration of the coating materials themselves maybe significantly decreases their protecting ability. Average diffusion coefficient of surface coating systems including artificial defects were quantified by electrolytic permeability test. It was experimentally verified that average diffusion coefficient can be expressed as a function of degree of defect.
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