C-Thrue GPR Application for Pavement Layer Scanning in Delhi-Vadodara Expressway Project

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c -thrue application-at Delhi-Vadodara Expressway

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

Requirement:-

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 scanning Pavement layer thickness

Solution:

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.

Layer within 0.0 ~ 0.1 m Depth Bitumen 1st Layer & Bitumen 2nd Layer Interface
(Layer within 0.0 ~ 0.1 m Depth Bitumen 1st Layer & Bitumen 2nd Layer Interface)
Layer within 0.2 ~ 0.3 m Depth Bitumen 3rd Layer & WMM Interface
(Layer within 0.2 ~ 0.3 m Depth Bitumen 3rd Layer & WMM Interface)
Layer within 0.3 ~ 0.6 m Depth WMM & GSV Interface
(Layer within 0.3 ~ 0.6 m Depth WMM & GSV Interface)
Layer within 0.1 ~ 0.2 m Depth Bitumen 2nd Layer & Bitumen 3rd Layer Interface
(Layer within 0.1 ~ 0.2 m Depth Bitumen 2nd Layer & Bitumen 3rd Layer Interface)
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:

Processed Pavement Layer Data for multiple layers upto 500mm
                     Processed Pavement Layer Data for multiple layers up to 500mm
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).

Actual Thickness Measured with CORE Sample
Actual Thickness Measured with CORE Sample

Pavement layer data was exported into excel for further access.

Pavement layer data was exported into excel for further access.

 

 

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