• 14433 N 73rd St., Scottsdale, AZ 85260
  • 602.541.5727


Ground Penetrating Radar

What is GPR used for?

  • Rebar
  • Pipes
  • Post-tension cables
  • Dowels
  • Plastic and fiber optic conduits
  • Detect voids, delaminations, and cracking 1/4-inch or greater within concrete.
  • Detect voids under concrete slabs
  • Measure concrete slab and deck thickness to within +/- 1/4-inch

Example: Roof level of the cast-in-place concrete structure. Above is the side view of the top and bottom layers of reinforcement in the 2’ X 2’ area. 

GPR Advantages

  • Ability to penetrate across concrete-air interfaces
  • GPR is safe for employees and electronic equipment in work zone. X-ray is extremely dangerous.
  • GPR will scan large areas faster than other methods. X-ray is extremely slow.
  • GPR needs access to only one side of concrete surface to scan. X-ray requires two sides.
  • GPR images are archived in 2D and 3D format and can be easily transmitted electronically. X-ray is 2D only.
  • GPR is very accurate, typically locating objects to within ± 1/4”. X-ray does not provide a distance from surface to object measurement.

GPR Limitations

  • Congested concentration of reinforcement at top of slab can prevent penetration of radar signal beyond top reinforcement to locate any lower objects in the slab. 
  • There needs to be contrast between the item to be located vs. material scanned. 
  • Need for experienced operators required to operate equipment and interpret results