| Project/Area Number |
04650427
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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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 | Setsunan University |
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Principal Investigator |
YAMURA Kiyoshi Setsunan University, Faculty of Engineering, Professor, 工学部, 教授 (30026257)
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| Co-Investigator(Kenkyū-buntansha) |
MICHIHIRO Kazutoshi Setsunan University, Faculty of Engineering, Associate Professor, 工学部, 助教授 (50100566)
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| Project Period (FY) |
1992 – 1993
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| Project Status |
Completed (Fiscal Year 1993)
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| Budget Amount *help |
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1993: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1992: ¥1,500,000 (Direct Cost: ¥1,500,000)
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| Keywords | Acoustic emission / Freezing and thawing action / Alkali aggregate reaction / Deterioration of concrete / Young' modulus / Strength / Kaiser effect / アルカリ骨材発生 / アコースティックユミッション |
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| Research Abstract |
Recently, Applications of acoustic emission (AE) technology to diagnostic tools attract great attention for the evaluation of deterioration of concrete.
In this study, AE characteristics of deteriorated concrete due to freezing and thawing actions or alkali silica reaction, during compressive loading were investigated. The results were compared with conventional parameters for evaluating the deterioration of concrete, such as compressive strength, Young's modulus and expansion characterisics. At the same time, Kaiser effect in concrete under several conditions of water cement ratio, concrete age, rate of initial loading and storing condition and term after initial loading were investigated.
The experimental results show that AE count rate in low stress lovel becomes large according to the deterioratin of concrete develope, and the AE count rate characteristics in the process of final failure are almost the same as that of the non-deteriorated concrete having the same compressive strenght. Kaiser effect in concrete can not be observed clearly especially in the case that the age of concrete at initial loading is low and the term of storing arter initial loading is long. These phenomena are considered to be used effectively for evaluation of deterioration of concrete.
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