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1SINTEF Building and Infrastructure
Use of Ground Penetrating Radar (GPR) for pavement assesment
Inge HoffSINTEF Building and Infrastructure
2SINTEF Building and Infrastructure
NTNU/SINTEF bought this type ofequipment October 2007
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Principle Radar signals transmittedReflection dependent on:
Dielectric propertiesConductivity
Reflected signal used to form image of layers and objectsbeneath surface
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• Step-frequency radar
• Controls up to 63 antennas
• GPS/Total Station interface
• 30 MHz - 1000 MHz (2 GHz option)
GeoScopeGeoScopeTMTM 33--dimensional GPRdimensional GPR
UltraUltra--wideband wideband antenna arrayantenna array
• 100 MHz - 2.0 GHz
• 16 - 63 antenna elements
• 1.2 - 2.4 meter swath width
•3.75 - 7.5 cm antenna element spacing
ProductsProducts
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Technical properties
Frequency range 100MHz – 2GHzNo of antenna elements 31Speed of measurements 2-80 km/tWidt 2.4 meterDepth range 1-3 meter
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Areas of appliaction (roads)
Rehabilitation (inspection before planning)
Control of rehabilitation
Quality control of new roads
Localisation of objects in the ground
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Other appliactions
AirportsRunways, taxiways (similar to roads)
RailwaysFine graded material in ballast
Bridges Coverage over reinforcementDamages
TunnelsAir voids behind frost protection walls
Other: water and sewer pipes, forensic, archaeology, etc
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Measurements
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Tunel wall Ila
Rock surface
Concrete
Void
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Conclusions
Relatively new tool in NorwayInterpretation of results is not straigth forwardStandard investigation before rehabilitationCost effectiveCombination with other methods of investigation
FWD, coring, etc
Some modification of hardware necessaryWill be very usefull with some adjustments