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Shin, Myoungsu
Sustainable Structural Systems Lab
Research Interests
  • Seismic design, Tall buildings, High performance composites, Ultrasonic non-destructive evaluation technologies

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Monitoring of self-healing in concrete with micro-capsules using a combination of air-coupled surface wave and computer-vision techniques

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Title
Monitoring of self-healing in concrete with micro-capsules using a combination of air-coupled surface wave and computer-vision techniques
Author
Ahn, EunjongKim, HyunjunGwon, SeongwooOh, Sung-RokKim, Cheol-GyuSim, Sung-HanShin, Myoungsu
Issue Date
2021-08
Publisher
SAGE PUBLICATIONS LTD
Citation
STRUCTURAL HEALTH MONITORING-AN INTERNATIONAL JOURNAL, pp.1475921721
Abstract
This study mainly aims to investigate the applicability of the combination of air-coupled surface-wave and computer-vision techniques to the evaluation of self-healing in in situ concrete members. Small-scale beam specimens were made from ordinary concrete and concretes with solid- and liquid-type capsules; the capsules were employed as self-healing agents. To monitor the crack healing progress, surface-wave tests using an air-coupled transducer and contact receivers were conducted on each specimen in uncracked, cracked, and healed conditions after 7, 14, 28, and 63 days of water immersion. Additionally, a computer-vision technique involving image binarization and registration was applied to measure high-resolution crack information. The specimens containing the micro-capsules showed superior healing performance compared to the ordinary concrete specimens. After 63 days of self-healing, the spectral energy transmission ratio increased up to about 80% of the uncracked, while the crack area decreased up to about 94% of the fully cracked. The healing rate was estimated using the change in spectral energy transmission ratio strongly correlated with that estimated using the change in crack area.
URI
https://scholarworks.unist.ac.kr/handle/201301/53778
URL
https://journals.sagepub.com/doi/10.1177/14759217211041002
DOI
10.1177/14759217211041002
ISSN
1475-9217
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