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http://dx.doi.org/10.9711/KTAJ.2022.24.1.039

Determination of acoustic emission signal attenuation coefficient of concrete according to dry, saturation, and temperature condition  

Lee, Hang-Lo (Disposal Performance Validation Research Division, Korea Atomic Energy Research Institute)
Hong, Chang-Ho (Disposal Performance Validation Research Division, Korea Atomic Energy Research Institute)
Kim, Jin-Seop (Disposal Performance Validation Research Division, Korea Atomic Energy Research Institute)
Kim, Ji-Won (Disposal Performance Validation Research Division, Korea Atomic Energy Research Institute)
Publication Information
Journal of Korean Tunnelling and Underground Space Association / v.24, no.1, 2022 , pp. 39-55 More about this Journal
Abstract
This study carried out the laboratory tests for AE signal attenuation to determine the attenuation coefficient (α) of silo concrete in Gyeongju low and intermediate-level disposal environments. The concrete samples were prepared by satisfying the concrete mixing ratio used in the Gyeongju disposal silo, and these samples were additionally exposed depending on the temperature conditions and saturation and, dry condition. As a result of attenuation tests according to the transmission distance on three concrete specimens for each disposal condition, the AE amplitude and absolute energy measured on the saturated concrete were higher than that of the dry concrete in the initial range of the signal transmission distance, but the α of the saturated concrete was higher than that of the dry concrete. Regardless of the saturation and dry conditions, the α tended to decrease as the temperature increases. The α had a more major influence on the saturation and dry condition than the temperature condition, which means that the saturation and dry condition is the main consideration in measuring the signal attenuation of a concrete disposal structure. The α of concrete in the disposal environment expect to be used to predict the integrity of silos concrete in Gyeongju low and intermediate-level disposal environments by estimating the actual AE parameter values at the location of cracks and to determine the optimum location of sensors.
Keywords
Disposal concrete; Thermal-hydraulic-mechanical condition; Acoustic emission; Attenuation coefficient;
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Times Cited By KSCI : 1  (Citation Analysis)
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