- Volume 19 Issue 4
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Bleeding characteristics of coupling materials for installation of acoustic emission (AE) sensor
AE 센서 설치를 위한 커플링 재료의 블리딩 특성
- 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))
- 이종원 (한국지질자원연구원, 복합재난대응연구단) ;
- 김현우 (한국지질자원연구원, 복합재난대응연구단) ;
- 김민관 (한국지질자원연구원, 복합재난대응연구단) ;
- 오태민 (한국지질자원연구원, 복합재난대응연구단)
- Received : 2017.07.04
- Accepted : 2017.07.25
- Published : 2017.07.31
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.
Supported by : 국가과학기술연구회
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