IN SITU DETERMINATION OF THE CHLORIDE CONTENT OF PORTLAND CEMENT CONCRETE IN BRIDGE DECKS--FEASIBILITY STUDY

The objective of this two-phase program is to develop a gauge and corresponding test method for rapid, local, in situ determinations of the total chloride ion concentration in P.C.C. bridge decks or other reinforced concrete members at the level of the outermost mat of reinforcing steel, with a sensitivity of 100 ppm Cl or better. In Phase I a literature search and paper study confirmed that X-ray fluorescence, thermal neutron activation and thermal neutron-prompt gamma analysis were the only promising techniques. A dual measurement method, employing both the prompt gamma and activation techniques, was shown to be feasible for nondestructive monitoring of chloride content at a specified depth or depth region below the surface with a sensitivity of 100 ppm or better, independently of the chloride content in the surface layers. The instrumentation could be used for rapid in-situ sample analysis.

  • Corporate Authors:

    Columbia Scientific Industries

    11950 Jollyville Road
    Austin, TX  United States  78759

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Rhodes, J R
    • Carino, N C
    • Sieberg, R D
    • Stout, J
    • TAYLOR, M C
  • Publication Date: 1977-2

Media Info

  • Pagination: 117 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00169742
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: FHWA-RD-77- 26 Intrm Rpt.
  • Contract Numbers: DOT-FH-11-8901
  • Files: NTIS, TRIS, USDOT
  • Created Date: Mar 14 1978 12:00AM