| Project/Area Number |
18560457
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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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 | Fukushima National College of Technology |
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Principal Investigator |
MIDORIKAWA Takehiko Fukushima National College of Technology, Civil Engineering, Associate Professor (50249744)
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| Project Period (FY) |
2006 – 2007
|
| Project Status |
Completed (Fiscal Year 2007)
|
| Budget Amount *help |
¥2,000,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥300,000)
Fiscal Year 2007: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2006: ¥700,000 (Direct Cost: ¥700,000)
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| Keywords | water repellent agent / concrete / salt damage / deterioration / migration test / chloride ion / penetration depth |
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| Research Abstract |
Concrete structures in Japan are exposed to two kinds of airborne salt, one from the sea and the other in the form of calcium chloride that is scattered on roads in winter. The airborne salt adheres to the surface of concrete and acts as a source of chloride ions, which gradually infiltrate into the concrete ; as time passes, reinforcement embedded within the concrete is eventually corroded by these chloride ions. In order to prevent damage to concrete structures from airborne salt, the surface of the concrete is treated with water repellent. However, the effects of such treatment are not yet clear.
In this study, the relationship between the thickness of the water repellent layer and the chloride ion blocking ability across the concrete is examined using a migration test. The experimental results clearly show that the blocking ability is influenced by the thickness of the water-repellent layer.
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