INVESTIGATION OF BRIDGE DECK CRACKING ON I-95 NORTHBOUND OVER POWELL CREEK. TECHNICAL ASSISTANCE REPORT

Shortly after construction, many longitudinal cracks were noted by Virginia Department of Transportation personnel in the concrete of deck span No. 6 of the bridge widening project on I-95 northbound over Powell Creek. Three cores were taken at crack locations. One full-depth core was obtained, in which the crack could be traced through the entire core. Because the cracks provided a direct path to the reinforcing steel for chloride ions, and in some cases went completely through the deck, the deck was quickly determined to be unacceptable. The Virginia Transportation Research Council was asked to examine the cores to determine the cause of the cracking. This examination led to the following conclusions: (1) The cracks in this deck are essentially straight, oriented in the longitudinal direction, and in many cases full depth; (2) The cracking of the deck began while the concrete was in the plastic state; (3) The primary cause of the cracking was plastic shrinkage resulting from the rapid loss of moisture from the concrete; (4) The cracked concrete was not adequately protected from the loss of moisture after placement and finishing; (5) The concrete had an excessive amount of large voids due to inadequate consolidation; (6) Settlement of the poorly consolidated concrete may have exacerbated the plastic cracking; and (7) Traffic-induced vibrations may have contributed to settlement primarily because the concrete was not adequately consolidated during placement.

  • Corporate Authors:

    Virginia Transportation Research Council

    530 Edgemont Road
    Charlottesville, VA  United States  22903

    Virginia Department of Transportation

    1401 East Broad Street
    Richmond, VA  United States  23219

    University of Virginia, Charlottesville

    Center for Transportation Studies, P.O. Box 400742
    Charlottesville, VA  United States  22904-4742
  • Authors:
    • Lane, D S
  • Publication Date: 1994-6

Language

  • English

Media Info

  • Features: Photos; References;
  • Pagination: 13 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00662925
  • Record Type: Publication
  • Report/Paper Numbers: VTRC 94-TAR6
  • Files: TRIS, STATEDOT
  • Created Date: Jul 29 1994 12:00AM