OPTIMISING THE USE OF GROUND PENETRATING RADAR (GPR) FOR URBAN

ROAD INVESTIGATIONS

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Ground-Penetrating Radar (GPR)Capabilities of GPR• Layer thicknesses• Void location• Stripping in asphalt layers• Presence of moisture• Detection/locate subsurface anomaliesGPR contributes to the structural assessment of pavements• Predict pavement performance• Determine upgrade requirements• Prevent unforeseen pavement failuresGPR is non-destructive• Quicker results• Fewer delays and interference IINFRASENSE, IInc..

OLD TECHINQUE OF ROAD INVESTIGATION

Trial pit method :

GPR FOR ROAD INVESTIGATION

GPR Equipment

• Data acquisition and control systems• GPR antennas – Air Coupled – Ground Coupled

Current Horn Antennas

1 GHz Horns 2 GHz Horns

Ground-Coupled Antennas

1.5 GHz 500 MHz

Sample Graphic GPR Data

Pavement Surfacedistance

Asphalt

Base

Time/depth

Sample Processed Graphic Dataon Asphalt Pavement

Pavement Surface

Asphalt

Base

Linear Plot of Pavement LayerThickness