| Project/Area Number |
16360225
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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 |
Structural engineering/Earthquake engineering/Maintenance management engineering
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| Research Institution | Nagaoka University of Technology |
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Principal Investigator |
MARUYAMA Kyuichi Nagaoka University of Technology, Vice President, 理事副学長 (30126479)
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| Co-Investigator(Kenkyū-buntansha) |
SHIMOMURA Takumi Nagaoka University of Technology, Faculty of Engineering Associate, Professor, 工学部, 助教授 (40242002)
KAMIHARAKO Akihisa Hirosaki University, Faculty of Science and Engineering, Research Associate, 理工学部, 助手 (70333713)
SAEKI Tatsuhiko Niigata University, Faculty of Engineering, Associate Professor, 工学部, 助教授 (90215575)
MIYAZATO Shinichi Kanazawa Institute of Technology, Faculty of Civil and Environmental Engineering, Associate Professor, 環境系, 助教授 (60302949)
HIBINO Makoto Kyusyu Institute of Technology, Faculty of Engineering, Associate Professor, 工学部, 助教授 (90313569)
桜田 良治 秋田工業高等専門学校, 助教授 (60290699)
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| Project Period (FY) |
2004 – 2005
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| Project Status |
Completed (Fiscal Year 2005)
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| Budget Amount *help |
¥14,500,000 (Direct Cost: ¥14,500,000)
Fiscal Year 2005: ¥5,100,000 (Direct Cost: ¥5,100,000)
Fiscal Year 2004: ¥9,400,000 (Direct Cost: ¥9,400,000)
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| Keywords | corrosion / airborne salt / surface coating / water repellent / desalination / diffusion coefficient / exposure test / chloride ingress / マクロセル腐食 / 塩害 / 凍結融解 / 過酷塩害環境 / 連続繊維シート |
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| Research Abstract |
1) Diffusion coefficient of chloride ions in mortar with admixtures was measured. Influences of kind and amount of admixtures on diffusion coefficient were investigated. Prediction equation of diffusion coefficient was proposed as a function of porosity and specific surface area of pore structure.
2) Exposure test of mortar specimens was conducted. Specimens were exposed in more than ten points in Niigata Prefecture. It was revealed that part of chlorides that had reached concrete surface can penetrate into concrete. Long term chloride ingress can be predicted based on the result of short term exposure test.
3) Local transport process of airborne salt around an actual concrete structure was measured. Numerical simulation method for transport process of airborne salt was developed.
4) Damage of concrete structures in Ishikawa Prefecture was investigated. Deterioration grade, amount of airborne salt and chloride ingress were examined.
5) Effectiveness of surface coating and water repellent was evaluated by laboratory test.
6) Damage of concrete bridges by de-icing agent was investigated in Northern Tohoku region. It is clarified that damage by de-icing agent may be localized.
7) Resistant of sprayed mortar against combined action of salt attack and frost damage was examined by electric migration test.
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