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Proceedings Paper

Damage detection in concrete and cementitious composites
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Paper Abstract

Traditionally ultrasonic testing is used to estimate the extent of damage in a concrete structure. However Pulse-velocity and amplitude attenuation methods are not very reliable, and are difficult to reveal early damage of concrete. In a previous study, a new active modulation approach, Nonlinear Active Wave Modulation Spectroscopy, was developed and found promising for early detection of damage in concrete. In this procedure, a probe wave is passed through the system in a fashion similar to regular acoustic methods for inspection. Simultaneously, a second, low-frequency modulating wave is applied to the system to effectively change the size and stiffness of flaws microscopically and cyclically, thereby causing the frequency modulation to change cyclically as well. It has been also shown that it is advantageous to apply the Hilbert-Huang transform to decompose nonlinear non-stationary time-domain responses of plain concrete. Such procedure leads to improving the damage detection sensitivity of this modulation method in concrete. In this paper, further investigation on mortar and fiber reinforced concrete will be presented and discussed.

Paper Details

Date Published: 21 April 2008
PDF: 13 pages
Proc. SPIE 6935, Health Monitoring of Structural and Biological Systems 2008, 69351K (21 April 2008); doi: 10.1117/12.779465
Show Author Affiliations
Hwai-Chung Wu, Wayne State Univ. (United States)
P. Frank Pai, Univ. of Missouri, Columbia (United States)


Published in SPIE Proceedings Vol. 6935:
Health Monitoring of Structural and Biological Systems 2008
Tribikram Kundu, Editor(s)

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