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Mapping Voids, Debonding, Delaminations, Moisture, and Other Defects Behind or Within Tunnel Linings (2013) / Chapter Skim
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Pages 33-34

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From page 33...
... 33 a p p e N D I x a accuracy The surface dielectric values calculated from the air-coupled ground-penetrating radar (GPR) data are used to determine where to test with in-depth nondestructive testing (NDT)
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From page 34...
... 34 Cost The price for a complete air-coupled GPR system with survey van and mounting is usually between $180,000 and $200,000. Limitations The air-coupled GPR surface dielectric is recommended for use in determining where to test tunnel linings with in-depth nondestructive testing devices.
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