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Ground Penetrating Radar

Ground Penetrating Radar (GPR) is one of the most specialized and cost-effective inspection methods that uses radio waves to penetrate into pavement, soil or other materials. Rii has been using GPR since 2002, and recent advancements allow surveys to be performed at speeds up to 65 mph so that traffic is not disrupted.

GPR is used for the nondestructive evaluation (NDE) and nondestructive testing (NDT) of the following:

  • Bridge Decks
  • Asphalt and Concrete Pavements
  • Vertical Concrete Structures
  • Subsurface Soil Investigations

Results typically provide information on pavement layer structure, joint conditions, subbase erosion and void spaces under slabs. GPR provides solutions for problem cost overruns of bridge and pavement rehabilitation projects; unconfirmed overlay thicknesses; and is extremely cost effective when combined with traditional coring and laboratory testing techniques. It provides positive and accurate delineation of deteriorated boundaries for reinforced bridge decks; accurate and quick confirmation of asphalt overlay measurements; and identification of rebar deterioration and delaminations.

Rii maintains the latest equipment and technologies needed to perform the analysis, testing, and evaluation of street and highway pavements and bridge decks. Surveys are performed with multiple scans so that 100% complete structure coverage is obtained. Depending on the objective of the survey, an appropriate antenna(s) is selected to best obtain the desired information in an efficient and economic fashion.

We have used GPR for client projects across the nation from New York State to California performing pavement condition, geophysical, and structure condition surveys for their capital improvement projects. Various applications of GPR include:

  • Bridge Deck Assessment
  • Rebar Depth Profile
  • Pavement Structure Evaluation/Inventory
  • Subsurface Facility Inspection
  • Overall Thickness of Asphalt (flexible) or Concrete (rigid) Pavement
  • Pavement Overlay Measurements
  • Evaluation of Parking Garages
  • Utility Locating
  • Post-Tension Cable and Rebar Locating
  • Grave Site Locating
  • Underground Storage Tank (UST) Location
  • Structural Inspection
  • Concrete Thickness Measurements
  • Rebar, PT Cable Locations
  • Soil Infrastructure Inspection
  • Aviation Facility Inspection
  • Railway Track Substructure

Check out the GPR team in action: