RECOMMENDED DEPTH OF COVER FOR BRIDGE DECK STEEL

Seventeen New Jersey bridge decks were surveyed by means of a pachometer (nondestructive electronic testing device). The overall standard deviation for depth of cover was found be approximately 0.375 in. (1.0 cm). Researchers have generally recommended a minimum depth of 2 in. (5.1 cm) to protect the steel from moisture and de-icing salts and thereby reduce the potential for spalling. If all the steel is to be kept below 2 in. (5.1 cm), a specified depth of cover of 3.125 in. (7.9 cm) is indicated. An operating characteristics curve is presented from which it is possible to determine the necessary specification to protect any selected percentage of steel. The curve indicates, for example, that 90 percent of the steel can be protected with a specification of 2.5 in. (6.4 cm). Also included are the statistical parameters for individual bridge decks and several basic suggestions to aid in the reduction of spalling distress.

Media Info

  • Media Type: Print
  • Features: Figures; References;
  • Pagination: pp 32-35
  • Monograph Title: Corrosion and corrosion protection
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00263936
  • Record Type: Publication
  • ISBN: 0309022908
  • Files: TRIS, TRB
  • Created Date: Dec 31 1974 12:00AM