Nonlinear Ultrasonic Investigation of Concrete Damaged under Uniaxial Compression Step Loading
Publication: Journal of Materials in Civil Engineering
Volume 22, Issue 5
Abstract
This research explains an experimental investigation of the concrete applying nonlinear ultrasonic testing technique. Eighteen cubic specimens, , were prepared from three concrete batches with w/c of 40, 50, and 60%, respectively. The hardened concrete specimens after 28-day of curing were simultaneously subjected to uniaxial compression and nonlinear ultrasonic testing. The specimens were damaged by gradually loading them in compression in several steps representing 0, 20, 40, 60, and 80%, respectively, of the specimen’s ultimate strength. At the end of each loading step ultrasonic evaluation was performed and the time domain waveforms were recorded at different power levels. Fast Fourier transformation (FFT) of the time domain waveforms was conducted to produce the frequency spectra. The data obtained from frequency spectra was used to study the change in signal amplitude or signal attenuation. It was found that attenuation is quite sensitive to different damage and power levels. The Fourier amplitudes obtained from FFT of the time domain data were normalized at fundamental frequency. Normalized spectra were used to examine the generation of second harmonic wave components. It was also found that the formation of second harmonic components are highly sensitive to increase in damage and change in power levels.
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Acknowledgments
This research was conducted with a financial support from Japan Society for the Promotion of Science (JSPS), which is thankfully acknowledged. The first writer also gratefully acknowledges the support provided by College of Engineering, King Saud University, Riyadh, Kingdom of Saudi Arabia.
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© 2010 ASCE.
History
Received: Aug 28, 2008
Accepted: Sep 3, 2009
Published online: Oct 2, 2009
Published in print: May 2010
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