CREEP OF COATED REINFORCING BARS IN CONCRETE

The creep properties of organic coated and uncoated No. 6 deformed steel reinforcing bars, embedded in concrete prisms, were determined for corresponding tensile stresses in the bars at the loaded ends of 15,000 psi (103 MN/sq m) and 30,000 psi (206 MN/sq m). Slip of the bars in the concrete under static loading was measured at both the free and loaded ends of the specimens at periodic intervals for two years. Twenty-four reinforcing bars were included in the tests, they consisted of 18 bars coated (in duplicates) with 9 different epoxy materials; 2 bars coated with a poly(vinyl chloride) material; and 4 uncoated reinforcing bars. The relative performance of some coated reinforcing bars in the creep study were different than those obtained in earlier pullout tests. Therefore, from the data obtained in this study, it appears that the long-term structural performance of organic coated reinforcing bars in concrete cannot be estimated solely on the basis of their bond strength determined from pullout tests.

  • Supplemental Notes:
    • Pub. in ASCE Jnl. Struct. Div. 105, nST10, p1935-1947, Oct 79.
  • Corporate Authors:

    National Bureau of Standards

    Connecticut Avenue at Van Ness Street, NW
    Washington, DC  USA  20008
  • Authors:
    • Clifton, J R
    • Mathey, R G
    • Anderson, E D
  • Publication Date: 1979-10

Media Info

  • Pagination: 13 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00313421
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: Final Rpt.
  • Files: TRIS
  • Created Date: Jun 26 1980 12:00AM