Application Name: C-Thrue GPR Application for Pavement Layer Scanning in Delhi-Vadodara Expressway Project of NHAI
Client- NHAI ( National Highways Authority of India)
Project Name- Delhi-Vadodara Expressway
Contractor- Apco Infratech
To scan & evaluate the pavement layer thickness & ensure the pavement is constructed as per the issued parameters.
APCO requires checking the pavement layer thickness (Includes bituminous layer, WMV & GSV) & to ensure the pavement is constructed as per the given specification & follows all the necessary guidelines.
APCO uses C-thrue GPR for pavement layer scanning to evaluate layer thickness being constructed for Delhi-Vadodara Expressway, a project of NHAI.
C-thrue is a high frequency 2 GHZ Dual Polarized Ground Penetrating Radar (GPR) for accurate scanning and real-time analysis of Pavement layers. It assists EPC Contractors, Road Construction Companies & Public works departments to check & ensure that road construction is being constructed as per laid down design parameters.
APCO uses C-thrue GPR for pavement layer scanning & evaluating the thickness of each layer.
Pavement Layers Design parameter is defined as:
Bituminous Layer – Total Thickness – 250 mm (100+80+70)
WMV – Total Thickness – 150 mm
GSV – Total Thickness – 200 mm
Step 1- Data Acquisition on pavement for Layer Capture
They start scanning the pavement layer at different depth evaluating layer by layer thickness with the help of C -thrue GPR & output data start getting captured by the equipment itself.
Step 2 (a)- Post-processing of data using semi-automatic to automatic GRED 3D Software
For pavement layer data analysis, use of post-processing software is necessary for interpretation of clear layer by layer depth. GRED 3D HD software allows semi-automatic to automatic post-processing of pavement layer data requiring minimal human intervention allowing long lengths of kms to be post-processed quickly.
In Step II, for a clear representation of each layer, Output data were interpreted by post-processing GRED 3D HD software:
Step 2 (b) : Calibration of Bituminous Layer
They use a sample core & measure the thickness manually to calibrate data based on bituminous design layers thickness 250mm (80+100+70).
Pavement layer data was exported into excel for further access.