One of the most severe problems facing the highway community is chloride ion-induced reinforcing steel corrosion and the subsequent deterioration of concrete bridge decks and marine structures. This report presents recommended methods for sampling and testing for both total and water-soluble chloride ion in hardened concrete. The methods are updated and expanded revisions of the earlier procedure developed by FHWA and contained in report FHWA-RD-72-12, "Determination of Chloride in Hardened Portland Cement Paste, Mortar and Concrete" by H. A. Berman and report FHWA-RD-74-5, "Evaluation of Portland Cement Concrete for Permanent Bridge Deck Repair." Alternate procedures for sampling the hardened concrete with either a core drill or a rotary impact drill are included. In addition, two alternate methods of chemical analysis are presented, the original potentiometric titration method and a significantly more rapid method employing the Gran endpoint determination procedure. Both are compatible with either chloride or silver ion-selective electrodes. /Author/

Media Info

  • Pagination: 25 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00172061
  • Record Type: Publication
  • Source Agency: Federal Highway Administration
  • Report/Paper Numbers: FHWA-RD-77- 85 Intrm Rpt., FCP 24B1012
  • Files: NTL, TRIS, USDOT
  • Created Date: Mar 29 1978 12:00AM