| Project/Area Number |
15H05530
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| Research Category |
Grant-in-Aid for Young Scientists (A)
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| Allocation Type | Single-year Grants |
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| Research Field |
Civil engineering materials/Construction/Construction management
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| Research Institution | Nihon University |
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Principal Investigator |
OSUMI Ayumu 日本大学, 理工学部, 助教 (40579413)
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| Project Period (FY) |
2015-04-01 – 2017-03-31
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| Project Status |
Completed (Fiscal Year 2016)
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| Budget Amount *help |
¥10,270,000 (Direct Cost: ¥7,900,000、Indirect Cost: ¥2,370,000)
Fiscal Year 2016: ¥7,670,000 (Direct Cost: ¥5,900,000、Indirect Cost: ¥1,770,000)
Fiscal Year 2015: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
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| Keywords | 非破壊検査 / 空中超音波 / 非線形音響 / 高調波 / 非接触 / き裂 / 計測工学 / 建築構造・材料 / 構造工学・地震工学 / 土木材料 / 強力超音波 / 非線形 / コンクリート |
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| Outline of Final Research Achievements |
In recent years, deterioration of concrete structures decades since construction was concerned, and development of effective noncontact nondestructive diagnostic technology is required. Genally, infrared method and electromagnetic wave method are developed and used. On the other hand, non-contact acoustic methods using acoustic waves have been researched and developed recently. The objective of this study is to develop a non-contact and non-destructive measurement system for imaging a micro crack in shallow layer in concrete by very high-intensity aerial ultrasonic waves and Laser Doppler galvanometer. In this study, we performed (1) development of experimental device (2) formation of experimental specimen (3) experiment of detecting defect by development system.
As a result, it is demonstrated that 1 mm wide cracks in shallow layer of mortar assuming concrete can be imaged with high accuracy using the developed experimental apparatus and measurement system.
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