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http://dx.doi.org/10.9711/KTAJ.2017.19.4.635

Bleeding characteristics of coupling materials for installation of acoustic emission (AE) sensor  

Lee, Jong-Won (Korea Institute of Geoscience and Mineral Resources (KIGAM))
Kim, Hyunwoo (Korea Institute of Geoscience and Mineral Resources (KIGAM))
Kim, Min-Koan (Korea Institute of Geoscience and Mineral Resources (KIGAM))
Oh, Tae-Min (Korea Institute of Geoscience and Mineral Resources (KIGAM))
Publication Information
Journal of Korean Tunnelling and Underground Space Association / v.19, no.4, 2017 , pp. 635-650 More about this Journal
Abstract
Acoustic emission (AE) sensors have broadly used to monitor the damage of underground structures and tunnels. The reliability of measured signal is determined by the coupling condition of the AE sensors which are embedded in the target underground structure. To secure the reliability of health monitoring results, it is important to understand the characteristics of the coupling materials. In this study, laboratory tests were performed using portland cement, micro cement, and gypsum as coupling materials in order to verify the bleeding characteristics. The effective parameters for bleeding were determined to be water-cement ratio, material type, curing time, and injected volume of coupling materials. As a results of the experimental study, the bleeding rate increases with an increase in a water-cement ratio and an injected volume; for portland cement, water-cement ratio and injected volume effects are larger than the micro cement. However, curing time is not much effective for occurrence of the bleeding phenomenon. It is anticipated that this study may be useful for the selection of suitable coupling materials for installation of acoustic emission sensors.
Keywords
Acoustic emission sensor; Sensor installation; Coupling; Bleeding;
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Times Cited By KSCI : 4  (Citation Analysis)
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