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:
  • Corporate Authors:

    Cement and Concrete Association

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

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

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