Ultrasonic wave attenuation measurement technique for damage evaluation of concrete = 콘크리트 손상평가를 위한 초음파 감쇠량 측정법

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Various nondestructive evaluation methods concerning the stress wave through-transmission method have been studied. The propagating velocity and attenuation of a stress wave depend on the material properties of the medium. While ultrasonic wave velocity has been widely used for estimating the elastic modulus of materials, ultrasonic wave attenuation is related to damage in the media. However, in the case of the through-transmission wave method for ultrasonic wave attenuation measurement using contact-type sensors, the amplitude of the measured ultrasonic signal is significantly affected by various external factors such as contact force, system setup, specimen surface condition and ultrasonic couplant. Therefore, in this study, a nondestructive evaluation technique using the self-compensating frequency response function is proposed to measure quantitative ultrasonic wave attenuation in cement-based materials. The proposed technique is able to measure the inherent attenuation of a material, not its relative attenuation. Measurement of inherent attenuation is possible using this experimental setup because the unbiased attenuation is self-compensated with a signal measured at PZT ceramic components inserted between a conventional transducer and the sample in order to except the transducer coupling condition. The reproducibility of the proposed technique is validated by an experimental comparison of conventional measurement and the proposed ultrasonic wave attenuation measurement using concrete and cement paste. Finally, the relevancy of the proposed technique is also validated through testing of damaged cement-based samples.
Advisors
Kwak, Hyo-Gyoungresearcher곽효경researcher
Description
한국과학기술원 : 건설및환경공학과,
Publisher
한국과학기술원
Issue Date
2010
Identifier
418855/325007  / 020083445
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 건설및환경공학과, 2010.2, [ 73 p. ]

Keywords

attenuation; damage; concrete; self-compensating; 자기보상기법; 감쇠량; 손상; 콘크리트

URI
http://hdl.handle.net/10203/30679
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=418855&flag=dissertation
Appears in Collection
CE-Theses_Master(석사논문)
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