FIELD TESTING THE CHLORIDE CONTENT OF SEA-DREDGED AGGREGATES

The authors describe the use of the quantab test strip for determining the chloride content of water extracted from sea-dredged aggregates, and compares the results with those obtained by the volhard titration method proposed for draft British standard BS 812. The principle of the quantab titrator is conversion of a length of brown silver dichromate in a capillary tube to white silver chloride, the length of the strip converted indicating the chloride content of the solution in which it is placed, by reference to a calibration chart. Details are given of the extraction procedure and the tests carried out by the authors. If the proposed British standard 24-hour extraction procedure is followed, quantals titrators may be used to determine the salt content of sea-dredged aggregate for all but reface purposes. A 15 minute extraction suitable for site testing of aggregate has been developed; the method is described in an appendix to the paper. A single estimation by this method can be completed in 30 minutes with an accuracy better than 0.02 percent nacl. The materials for each test cost about 15P. /TRRL/

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00105317
• Corporate Authors:

  Cement and Concrete Association

  52 Grosvenor Gardens
  London SW1W 0AQ,   England 
• Authors:
  • FIGG, J W
  • LEES, T P
• Publication Date: 1975-9

Language

• English

Media Info

• Features: Figures; Photos; References; Tables;
• Pagination: p. 38-40
• Serial:
  • CONCRETE
  • Volume: 9
  • Issue Number: 9
  • Publisher: THE CONCRETE SOCIETY
  • ISSN: 0010-5317

Subject/Index Terms

• TRT Terms: Aggregates; Calibration; Chemical analysis; Chemical reactions; Chlorides; Construction sites; Dredging; Field tests; Halides; Resource extraction; Seas; Seawater; Sodium chloride; Speed; Standards
• Uncontrolled Terms: Extraction (Chemistry)
• Geographic Terms: United Kingdom
• ITRD Terms: 4577: Aggregate; 6171: Calibration; 3628: Construction site; 3613: Dredging; 7171: Extraction; 7314: Halide; 7156: Reaction (chem); 4368: Sea; 7316: Sodium chloride; 187: Specification (standard); 5408: Speed; 8119: United Kingdom
• Subject Areas: Geotechnology; Highways; Marine Transportation; Materials; I36: Aggregates;

Filing Info

• Accession Number: 00132314
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Files: ITRD, TRIS
• Created Date: Jun 23 1976 12:00AM