A new method for measuring in situ concrete elastic constants using horizontally polarized conical transducers
Journal
Journal of the Acoustical Society of America
Journal Volume
101
Journal Issue
1
Pages
330-336
Date Issued
1997
Author(s)
Abstract
This paper presents a result on the measurements of longitudinal and Rayleigh wave velocities in a concrete plate using horizontally polarized conical transducers. The characteristics of horizontally polarized surface responses due to a point source applied at a half-space and a plate are analyzed and discussed. The analyses show that the horizontal component of a skimming longitudinal wavefront due to a point source is much larger than its vertical component. This suggests the utilization of a horizontal component of a surface response to detect the skimming longitudinal wavefront. In addition, theoretical analysis shows that by using the horizontal component to determine the Rayleigh wave velocity, the source-to-receiver distance can be reduced significantly. Homemade horizontally polarized conical transducers were fabricated to demonstrate the feasibility of the present method on measuring the dynamic concrete elastic constants. Experimental results on the measurements of the horizontal component of a surface response due to a point impact were in good agreement with the theoretical prediction. In conclusion, it is noted that, based on this proposed method, concrete dynamic elastic constants can be determined through a single transient elastic wave experiment.
SDGs
Type
journal article