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Title |
Effects of Moisture Content in Concrete on Diffuse Ultrasound
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Authors |
안은종(Eunjong Ahn) ; 신명수(Myoungsu Shin) |
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DOI |
https://doi.org/10.11112/jksmi.2020.24.1.142 |
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Keywords |
콘크리트; 확산초음파; 함수량 Concrete; Diffuse ultrasound; Moisture content |
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Abstract |
This study investigates the effects of moisture content on diffuse ultrasound to be applied for the evaluation of micro-structural damage in concrete subjected to various environmental conditions. We monitored diffuse wave parameters for concrete samples in process of water saturation for 5 days. Dried samples were immersed in a water bath, and the change of moisture content in concrete were estimated by measuring the change of mass. For the diffuse wave analysis, a frequency range of 500 kHz, which represents a scattering regime of ultrasound in concrete, was selected. The test results reveal that the ultrasonic diffusivity slightly changed, and the ultrasonic dissipation significantly increased by approximately 120% in the process of water saturation. Therefore, the moisture content in concrete should be considered for the evaluation of micro-structural damage using diffuse wave techniques.
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