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논문 기본 정보

자료유형
학술저널
저자정보
Yim, Hong Jae (Department of Construction and Disaster Prevention Engineering, Kyungpook National University) Park, Sun-Jong (Department of Civil Engineering, Korean Advanced Institute for Science and Technology) Kim, Jae Hong (School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology) Kwak, Hyo-Gyong (Department of Civil Engineering, Korean Advanced Institute for Science and Technology)
저널정보
테크노프레스 Smart structures and systems Smart structures and systems 제17권 제1호
발행연도
2016.1
수록면
45 - 58 (14page)

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Freezing and thawing cycles induce deterioration and strength degradation of concrete structures. This study presumes that a large quantity of contact-type defects develop due to the freezing and thawing cycles of concrete and evaluates the degree of defects based on a nonlinearity parameter. The nonlinearity parameter was obtained by an impact-modulation technique, one of the nonlinear ultrasonic methods. It is then used as an indicator of the degree of contact-type defects. Five types of damaged samples were fabricated according to different freezing and thawing cycles, and the occurrence of opening or cracks on a micro-scale was visually verified via scanning electron microscopy. Dynamic modulus and wave velocity were also measured for a sensitivity comparison with the obtained nonlinearity parameter. The possibility of evaluating strength degradation was also investigated based on a simple correlation of the experimental results.

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