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Ground Penetrating Radar
🐘 Tusker VaultAdvancedResonance & Wave • GPR

Ground Penetrating Radar (GPR)

Method Overview

Subsurface imaging method projecting electromagnetic radar pulses to detect rebar, conduits, and voids in concrete or soil structures.

Core Method Specifications

Technique IDGPR
AcronymGPR
CategoryAdvanced
ModalityResonance & Wave
Standardized Report TemplateISO 17020 Ready
GPR-Standard-TemplateTest in Sandbox

Target Applications & Governing Standards

3 Scopes Configured
Concrete & Structural Engineering
ASTM D4748 ACI 228.2R ASTM D6432
Target Assets / Components:
Reinforced Concrete SlabsBridge DecksPost-Tensioned BeamsConcrete Retaining Walls
Detectable Defects & Anomalies:
• Rebar Misalignment & Depth• Conduit Location• Delamination• Subsurface Voids• Post-Tension Cable Mapping
Subsurface Utility Engineering (SUE)
ASCE 38-22 ASTM D6432
Target Assets / Components:
Metallic & Non-Metallic Underground PipesFiber Optic DuctsElectrical LinesUnderground Storage Tanks (UST)
Detectable Defects & Anomalies:
• Utility Strikes Prevention• Sinkholes• Soil Cavities• Underground Vault Location
Storage Tank Foundations & Subgrade
API 653 ASTM D6432
Target Assets / Components:
Concrete Ringwall FoundationsTank Bottom Slab SubgradeHeavy Machinery Support Pads
Detectable Defects & Anomalies:
• Sub-slab Voiding• Rebar Corrosion• Soil Erosion• Subgrade Settlement

Method Limitations & Operational Boundary Conditions

Critical physics limits, thermal envelopes, blind spots, and ASME Sec V / API procedural boundaries for GPR.

Level III Procedure Control
Operating Temp Envelope
Standard Envelope-10°C to +50°C (14°F to 122°F) control unit and antenna
High-Temp CapabilityDry concrete surfaces up to 60°C (140°F)

Frozen soil or subgrade ice significantly alters dielectric permittivity, speeding up radar waves.

Thickness & Dead Zone
Min ThicknessHigh-frequency concrete antennas (1.6 to 2.6 GHz): resolves targets from 10 mm to 500 mm (0.4 to 20 in) depth
Max RangeLow-frequency utility antennas (200 to 400 MHz): penetrates 1 m to 5 m (3 to 16 ft) in dry sandy soil; severely limited in clay
Near-Surface Dead Zone

Direct antenna coupling wave obscures the first 20 mm to 50 mm (0.8 to 2.0 in) beneath antenna face

Surface Condition & Couplant
Roughness & PrepRelatively flat scanning path for smooth antenna cart or skid plate traversal
Coating TolerancePasses cleanly through asphalt overlays, epoxy floor coatings, and ceramic tiles; metal foil or metallic sheeting blocks all radar penetration
Couplant / Media

None (air-launched or direct ground-coupled electromagnetic pulses)

Geometry & Orientation
Orientation Sensitivity

Antenna polarization MUST cross linear targets (rebar, pipes) at 90° angle for optimum hyperbolic reflection profiles

Clearance:Requires clear rolling path for antenna cart; 150 mm edge dead zone along vertical walls and columns
Critical Blind Spots
  • •Wet conductive clay soils, saline subgrade, and fresh un-cured concrete (< 28 days old) completely absorb and dissipate radar pulses
  • •Closely spaced dense rebar mats (spacing < 50 mm) create a Faraday cage shield, blocking radar from seeing conduits below
False Indication Trap:

Ghost hyperbolic reflections from overhead steel beams, metal fences, or cart wheels (air wave reflections)

Recommended Cross-Validation
UTView Method

Ultrasonic pulse velocity (UPV) or ultrasonic shear wave tomography (MIRA) to verify concrete voids

ETView Method

Electromagnetic rebar cover meter (pachometer) to verify shallow rebar depth and diameter

Level III Code Compliance Directive:ASTM D6432 and ACI 228.2R mandate time-zero calibration and dielectric permittivity calibration against a target of known depth.

Technique-to-OEM Compatibility Matrix

Verified manufacturers, instrument models, and diagnostic portals supporting GPR.

8 Verified OEMs
Sensors & Software (Radiodetection)

Sensors & Software (Radiodetection)

Canadian designer of Ground Penetrating Radar (GPR) systems for concrete structural evaluation, utility detection, and geological scanning under SPX Technologies.

Modalities:GPR
OEM Profile SenSoft Customer Support
OEM Site
GSSI (Geophysical Survey Systems)

GSSI (Geophysical Survey Systems)

Global pioneer and market leader in Ground Penetrating Radar (GPR) systems for concrete rebar imaging, bridge deck evaluation, utility locating, and geotechnical surveys.

Modalities:GPR
OEM Profile GSSI Support Center
OEM Site
MALÅ GPR (Guideline Geo)

MALÅ GPR (Guideline Geo)

Swedish manufacturer under Guideline Geo providing HDR Ground Penetrating Radar systems for infrastructure integrity, pavement analysis, and utility mapping.

Modalities:GPR
OEM Profile Guideline Geo Support
OEM Site
IDS GeoRadar (Hexagon)

IDS GeoRadar (Hexagon)

Hexagon subsidiary manufacturing multi-channel array GPR and slope stability radar systems for geotechnical monitoring and underground utility 3D modeling.

Modalities:GPR
OEM Profile IDS GeoRadar Portal
OEM Site

Sensors & Software

OEM Manufacturer for GPR inspection systems.

Verified Partner

GSSI

OEM Manufacturer for GPR inspection systems.

Verified Partner

MALA GPR

OEM Manufacturer for GPR inspection systems.

Verified Partner

IDS GeoRadar

OEM Manufacturer for GPR inspection systems.

Verified Partner
ASME Sec V & ISO 9712 Qualified
Rent GPR Instruments OEM Hardware CatalogPost GPR Project Scope