AN INSTRUMENT FOR DETECTING DELAMINATION IN CONCRETE BRIDGE DECKS

ALTHOUGH MANY FACTORS ARE REQUIRED TO CHARACTERIZE THE EXTENT OF DETERIORATION IN A BRIDGE DECK, THERE ARE TWO FACTORS THAT CAN BE CONSIDERED OF PARAMOUNT IMPORTANCE: DELAMINATION (A SEPARATION OF THE ORIGINAL SLAB INTO TWO OR MORE APPROXIMATELY HORIZONTAL LAYERS) AND POOR QUALITY CONCRETE. THESE TWO FACTORS WERE SINGLED OUT BECAUSE IT WAS FELT THAT MOST STRUCTURAL DAMAGE TO DETERIORATING BRIDGE DECKS RESULTED FROM ONE OR THE OTHER OR BOTH OF THESE DEFECTS. OTHER CONSIDERATIONS IN THE SELECTION OF THESE FACTORS ARE THAT DAMAGE TO STRUCTURES CAUSED BY THEM IS OFTEN NOT VISIBLE UNTIL SIGNIFICANT DETERIORATION IS PRESENT AND, ALSO, THAT THE KNOWN TECHNIQUES FOR THEIR DETECTION ARE SLOW AND TEDIOUS. THUS, THE MAJOR EMPHASIS OF THIS RESEARCH HAS BEEN DIRECTED TOWARD METHODS FOR DETECTING DELAMINATION AND ALSO DETECTING POOR QUALITY CONCRETE. THIS REPORT DESCRIBES AN INSTRUMENT THAT HAS BEEN DEVELOPED SPECIFICALLY TO DETECT DELAMINATION. IT ALSO INCLUDES AN EVALUATION OF THE DEVICE, ACCOMPLISHED BY MEASURING SPECIALLY CONSTRUCTED TEST SLABS AND NUMEROUS IN-SERVICE BRIDGES. ALL EVALUATION TESTS THAT HAVE BEEN CONDUCTED INDICATE THAT THE INSTRUMENT SATISFACTORILY DETECTS DELAMINATION IN BRIDGE DECKS AND THAT IT PROVIDES A RAPID AND PRACTICAL TOOL FOR ROUTINE USE IN BRIDGE CONDITION SURVEYS.

Media Info

  • Media Type: Print
  • Features: Figures; References;
  • Pagination: pp 44-52
  • Monograph Title: Highway and bridge maintenance: operations, costs, and modeling
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00219166
  • Record Type: Publication
  • ISBN: 0309021839
  • Files: TRIS, TRB
  • Created Date: Jan 31 1974 12:00AM