Evaluation of freezing and thawing damage of concrete using a nonlinear ultrasonic method

Hong Jae Yim , Sun-Jong Park , Jae Hong Kim , Hyo-Gyong Kwak

Abstract

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.

Key Words

concrete; freezing and thawing; nonlinear ultrasonic method; contact-type defect

Address

Hong Jae Yim — Department of Construction and Disaster Prevention Engineering, Kyungpook National University, 2559 Gyeongsang-daero, Sangju, Gyeongsangbuk-do, 742-711, Korea
Sun-Jong Park and Hyo-Gyong Kwak — Department of Civil Engineering, Korean Advanced Institute for Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Korea
Jae Hong Kim — School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology, Ulsan 698-798, Korea

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