EFFECTIVENESS OF GROUND PENETRATING RADAR FOR PREPARING PRE-TENDER DETERIORATION ESTIMATES ON ASPHALT COVERED REINFORCED CONCRETE BRIDGE DECKS

The Penetradar Integrated Radar Inspection System (IRIS) Ground Penetrating Radar (GPR) was selected by Dalhousie University as the most appropriate technology for assessing the condition of asphalt-covered reinforced concrete bridge decks because of its ability to penetrate asphalt concrete overlays and data collection at traffic speeds up to 75-80 km/hr. This technology was selected from a list of other nondestructive test methods such as infrared thermography, ultrasonic methods, and impact echo testing. A research program was designed to examine the accuracy and confidence with which GPR can be used to predict the quantity and location of top layer reinforcement delaminations and damage from freezing and thawing at the asphalt/concrete interface. Seventy-two asphalt-covered reinforced concrete bridge decks were surveyed at traffic speeds using GPR for deterioration estimation. Data were recorded by collecting adjacent 0.75-m wide strips along the deck length. The GPR data were processed manually to determine areas of excess signal attenuation and areas of high concrete relative dielectric constant. Deterioration predictions made using GPR were compared quantitatively and spatially to ground-truthing data obtained from nine bridge decks using the well-established chain drag and half-cell potential surveys after the asphalt was removed from each bridge deck just prior to repair. Good to excellent correlation between the GPR predicted deterioration quantity and locations were observed on each of the nine bridge decks with the quantity and location of deterioration found on the decks using the ground-truthing methods. On a network level, the GPR results were observed to underestimate the actual repair quantity by 1.5% of the bridge deck surface area. The 95% upper and lower confidence limits of the GPR prediction of the deterioration quantities as a percent of the deck surface area were observed to be 8.3% underestimation and 4.6% overestimation with respect to the actual repair quantities.

  • Availability:
  • Supplemental Notes:
    • This entry in the TRIS database is made from the hardback copy of the conference proceedings, which are also available on CD-ROM.
  • Corporate Authors:

    Technomic Publishing Company, Incorporated

    851 New Holland Avenue, Box 3535
    Lancaster, PA  United States  17604
  • Authors:
    • Barnes, C L
    • Trottier, J-F
  • Conference:
  • Publication Date: 2000

Language

  • English

Media Info

  • Features: References; Tables;
  • Pagination: p. 47-52

Subject/Index Terms

Filing Info

  • Accession Number: 00793103
  • Record Type: Publication
  • ISBN: 1566769493
  • Files: TRIS
  • Created Date: May 2 2000 12:00AM