Acoustic evaluation of concrete delaminations using ball-chain impact excitation

Acoustic evaluation of concrete delaminations using ball-chain impact excitation

This letter presents an automated acoustic sensing device for rapid detection of delamination in concrete. The device consists of ball-chains for continual impact excitation and multi-channel microphones for acoustic sensing. A ball-chain is formed by multiple metal balls connected by flexible ropes...

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Veröffentlicht in:The Journal of the Acoustical Society of America 2017-05, Vol.141 (5), p.EL477-EL481
Hauptverfasser: Sun, Hongbin, Zhu, Jinying, Ham, Suyun
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container_start_page EL477
container_title The Journal of the Acoustical Society of America
container_volume 141
creator Sun, Hongbin
Zhu, Jinying
Ham, Suyun
description This letter presents an automated acoustic sensing device for rapid detection of delamination in concrete. The device consists of ball-chains for continual impact excitation and multi-channel microphones for acoustic sensing. A ball-chain is formed by multiple metal balls connected by flexible ropes and is dragged on concrete surface to excite vibration of delaminations. Compared to the conventional chain drag test, the ball-chain generates acoustic signals with higher signal-to-noise ratio (S/N) because the balls give isolated but continual impacts on concrete surface during dragging. The proposed method was validated on a concrete specimen with artificial delaminations.
doi_str_mv 10.1121/1.4983343
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title Acoustic evaluation of concrete delaminations using ball-chain impact excitation
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