| Project/Area Number |
60850094
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| Research Category |
Grant-in-Aid for Developmental Scientific Research
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| Allocation Type | Single-year Grants |
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| Research Field |
コンクリート工学・土木材料・施工
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| Research Institution | Kyoto University |
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Principal Investigator |
KOBAYASHI Kazuo (1986) Associate Professor, Faculty of Engineering, Kyoto University, 工学部, 助教授 (10021586)
岡田 清 (1985) 京都大学, 工, 教授 (00025777)
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| Co-Investigator(Kenkyū-buntansha) |
INOUE Susumu Instructor, Faculty of Engineering, Kyoto University, 工学部, 助手 (30168447)
MIYAGAWA Toyoaki Instructor, Faculty of Engineering, Kyoto University, 工学部, 助手 (80093318)
FUJII Manabu Associate Professor, Faculty of Engineering, Kobe University, 工学部, 助教授 (30031074)
KOYANAGI Wataru Professor, Faculty of Engineering, Gifu University, 工学部, 教授 (30025928)
OKADA Kiyoshi Professor, Faculty of Engineering, Fukuyama University, 工学部, 教授 (00025777)
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| Project Period (FY) |
1985 – 1986
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| Project Status |
Completed (Fiscal Year 1986)
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| Budget Amount *help |
¥4,500,000 (Direct Cost: ¥4,500,000)
Fiscal Year 1986: ¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1985: ¥2,500,000 (Direct Cost: ¥2,500,000)
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| Keywords | Damaged Concrete structure / Repair / Polymer / Alkali Aggregate Expansion / Crack Injection / Lining / ライニング / 衝撃摩耗 / 損傷コンクリート |
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| Research Abstract |
Generally, concrete structures have long service life. But, recently, concrete structures deteriorated in early stage have been found. The causes of deterioration are wrong design and construction, use of materials of poor quality, overloading, extra severe environments and so on. Especially, the deterioration due to alkali aggregate reaction is reported in T.V.. It was said that there were almost no posibilities that alkali aggregate reaction occurred in Japan, and therefore there is few available reports about repair of concrete structures damaged by alkali aggregate reaction.
Reparing methods of damaged concrete structures by application of polymers (injection into cracks, impregnation into concrete, surface lining) and their effects were tested in this study.
The main conclusions obtained from this study are that <i> ) the damaged reinforced concrete beams could regain the excellent static and dynamic behaviors comparable to those of normal beams when repaired by means of injection and patching with epoxy resin, <ii> ) the crack bridging ability of polymer lining could be improved by use of polymer having high tensile elongation or polymer reinforced with glass fibers, and any significant difference of this ability was not observed under two types of loading (flexure and shear), <iii> ) the resin concrete had an extremely high abraision resistance under impact loading in comparison with ordinary cement concrete, and <iv> ) the attainment of lower water content in concrete by application of polymers was very effective for preventing the expansion due to alkali aggregate reaction.
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