SAMPLING AND TESTING FOR CHLORIDE ION IN CONCRETE

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/

• 
• Record URL:
  https://rosap.ntl.bts.gov/view/dot/16463
• Corporate Authors:

  Federal Highway Administration

  Office of Research and Development, 1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Authors:
  • CLEAR, K C
  • Harrigan, E T
• Publication Date: 1977-8

Media Info

• Pagination: 25 p.

Subject/Index Terms

• TRT Terms: Bridge decks; Chemical analysis; Chlorides; Core samples; Corrosion; Drilling; Offshore construction; Reinforced concrete; Rotary drilling; Sampling; Testing
• Old TRIS Terms: Core drilling
• Subject Areas: Highways; Materials;

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