PART III: CONDITION OF 249 FOUR-YEAR-OLD BRIDGE DECKS

249 BRIDGE DECKS IN PENNSYLVANIA, WHICH ARE OVER 30 FEET IN LENGTH AND WERE BUILT IN 1966 WERE EXAMINED FOR SIGNS OF DETERIORATION. EVIDENCE OF FRACTURE PLANES, SPALLS, CRACKS, SURFACE MORTAR DETERIORATION, AND MINOR EVIDENCE OF DETERIORATION WERE EVALUATED. THIS DETERIORATION WAS CORRELATED WITH ALL POSSIBLE FACTORS WHICH WERE BELIEVED TO INFLUENCE SUCH DETERIORATION, SUCH AS: STRUCTURAL STIFFNESS, DEPTH OF STEEL, SUPERSTRUCTURE TYPE, CONSTRUCTION PRACTICES, FLEXURAL STRENGTH OF THE CONCRETE, RETARDER USE, NUMBER OF SALT APPLICATIONS PER YEAR, FORM TYPE, SPAN LENGTH, MAXIMUM PLACEMENT TEMPERATURE, ANTISKID MATERIAL, AVERAGE DAILY TRAFFIC, DEICING CHEMICAL TYPE, FINISHING MACHINE, AND AGGREGATE SOURCES. THREE PRIMARY CONCLUSIONS AND FINAL RECOMMENDATIONS WERE ADVANCED: (1) BOTH EXCELLENT AND POOR QUALITY BRIDGE DECKS CAN BE CONSTRUCTED USING PRESENT PRACTICES AND SPECIFICATIONS. IT APPEARS THAT SPECIFIC PRACTICES AND SPECIFIC MATERIALS CAUSE DETERIORATION. (2) DIFFERENT CONTRACTORS PRODUCE DECKS OF WIDELY DIFFERENT QUALITIES. THIS SUGGESTS THAT SOME CONSTRUCTION PRACTICES ARE BETTER THAN OTHERS IN REDUCING OR ELIMINATING THE THREE PRINCIPAL FORMS OF DETERIORATION. THE PRIME EXAMPLE OF THIS IS THE RECURRENT RELATIONSHIP WE OBSERVED BETWEEN FRACTURE PLANES AND SPALLS AND SHALLOW REINFORCING STEEL. (3) ALTHOUGH STAY-IN-PLACE (SIP) FORMED DECKS HAVE FAR FEWER CRACKS THAN CONVENTIONALLY FORMED DECKS, THEY EXHIBIT SOMEWHAT MORE MORTAR DETERIORATION (PRIMARILY EVIDENCED BY WEAR). /PSU/

  • Corporate Authors:

    Pennsylvania State University, University Park

    Pennsylvania Transportation Institute, Transportation Research Building
    University Park, PA  USA  16802

    Pennsylvania Department of Transportation

    1215 Transportation and Safety Building
    Harrisburg, PA  USA  17120
  • Authors:
    • Cady, P D
    • Carrier, R E
    • Bakr, T A
    • Theisen, J C
  • Publication Date: 1971-12

Media Info

  • Pagination: 153 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00208058
  • Record Type: Publication
  • Source Agency: Federal Highway Administration
  • Files: TRIS, USDOT, STATEDOT
  • Created Date: Feb 3 1973 12:00AM