Mapping Voids, Debonding, Delaminations, Moisture, and Other Defects Behind or Within Tunnel Linings (2013) / Chapter Skim
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Pages 205-208
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205 a p p e N D I x O Introduction This appendix describes the progress of a particular nondestructive testing (NDT) technique known as acoustic sounding and outlines how this system will work within the framework of the second Strategic Highway Research Program (SHRP 2)
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206 flexural vibration) , and Lx and Ly are the respective side lengths of the tile.
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207 Figure O.2. Debonded regions of tile (left)
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208 Conclusion This automated sounding technique is still under development. Many factors influence the peak frequencies observed in the frequency spectrum from a single tile tap, including the size of the void, whether or not the hammer tap is directly in the center of the tile, and multiple mode interference.
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