GPR Inspection on Concrete Girders
Ground penetrating radar is the preferred non destructive test to identify objectives under concrete.

How ground penetrating radar is used on concrete

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Ground penetrating radar (GPR) inspections are typically requested when it is necessary to locate metallic or non-metallic pipes, conduit, re-bar or post-tension cables inside concrete. GPR is a four-step process that includes:

  • Placing a survey mat on the site
  • Moving a transducer over a pre-defined grid
  • Calibrating for the material
  • Analyzing the map produced by the scan

Some of the usual grid sizes examined are 24" X 24", 48" X 48" or 96"x96". Color plan views are used to image the details of structures inside the concrete. Results can be provided in hard-copy print-outs or as a digital copy.

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