Ground-penetrating radar (GPR) is used to evaluate pavements, bridge decks, abutments, piers, and other constructed facilities to assess as-built conditions as well as damage and deterioration that develops over time. Two basic types of GPR equipment systems are used, depending on the type of antenna employed: ground-coupled antennas or air-coupled horn antennas. Most suitable for deeper penetrations and for object detection are the ground-coupled antennas, which are more practical where survey speed is not critical. Most suitable for driving speed measurements are the air-coupled horn antennas, where quantitative high resolution results are required. Two types of data processing are used to evaluate the data: 1) qualitative assessments and manual calculations from graphically displayed data, which is most appropriate for site-specific evaluations; and 2) automated processing of the raw radar waveforms, which is most appropriate for production surveys, such as pavements and bridge decks. Research studies have confirmed the GPR findings for some applications, such as the measurement of pavement thickness and depth of reinforcement. For other applications, such as detection of voids under concrete, the method can only be used reliably on a site-specific basis. Further development and verification is needed before GPR can become generally applicable. New technologies under development promise to enhance the range of applicability of the GPR technique.


  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00726931
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Oct 10 1996 12:00AM