GPR PERFORMANCES FOR THICKNESS CALIBRATION ON ROAD TEST SITES

This paper presents ground penetrating radar (GPR) experiments conducted on a number of road test sites. In its capacity as a State civil engineering research organization, the Laboratoire Central des Ponts et Chaussees (LCPC) possesses large-scale testing facilities, such as a circular pavement fatigue test track, ideal for road-related research. This particular facility is composed of several sections of different known structures especially well-adapted for GPR investigations. Our study of GPR techniques made use of a commercial system for measuring asphalt layer thickness. Various road structures have been examined with a GSSI system. Cores have been drilled and permittivity measurements performed in the laboratory. The initial study reveals a comparison between thickness measured by coring and that calculated from both measured permittivities and GPR-selected times. A second study has consisted of avoiding calibration with core drilling, by means of recording GPR signals with a non-destructive testing technique on the multi-layer structures (i.e. common middle point). A numerical reconstruction has then been developed in order to calculate the thickness and velocity of each layer from experimental data. When compared with the cored samples, results show a sufficient level of accuracy in the first two or three layer thickness measurements to satisfy the needs of road facility managers. (A)

• Availability:
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• Corporate Authors:

  Elsevier

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  Kidlington, Oxford  United Kingdom  OX5 1GB
• Authors:
  • FAUCHARD, C
  • Derobert, X
  • CARIOU, J
  • Cote, P
• Publication Date: 2003-3

Language

• English

Media Info

• Features: References;
• Pagination: p. 67-75
• Serial:
  • NDT & E International
  • Volume: 36
  • Issue Number: 2
  • Publisher: Elsevier
  • ISSN: 0963-8695

Subject/Index Terms

• TRT Terms: Calibration; Measurement; Nondestructive tests; Pavement layers; Pavements; Radar; Test tracks; Tests; Thickness
• ITRD Terms: 6171: Calibration; 2952: Layer; 6136: Measurement; 6216: Non destructive testing; 2955: Pavement; 6738: Radar; 6255: Test; 2789: Test track; 5933: Thickness
• Subject Areas: Highways; Pavements;

Filing Info

• Accession Number: 00962593
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• Files: ITRD
• Created Date: Sep 3 2003 12:00AM