DETERMINATION OF LOW LEVELS OF CHLORIDE IN HARDENED PORTLAND CEMENT PASTE, MOTAR, AND CONCRETE

Errors occur in the analysis of cement and concrete samples containing less than 0.02% C1 when the potentiometric ion electrode titration method published earlier is used (Journal of Materials, JMLSA, Vol. 7, No. 3, 1972, pp. 330-335). Slow nucleation of AgC1 and slow equilibration produce large initial voltage increments which may be mistaken for the end point. A preliminary addition of 1 or 2 ml of 0.01 N NaC1 delays the end point and places it in a nonambiguous region of the titration. Examples are given of titrations with the without the NaC1 addition and a technique for handling millivoltmeter needle instability is described.

  • Corporate Authors:

    American Society for Testing and Materials

    100 Barr Harbor Drive, P.O. Box C700
    West Conshohocken, PA  USA  19428-2957
  • Authors:
    • Berman, H A
  • Publication Date: 1975-5

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00096268
  • Record Type: Publication
  • Report/Paper Numbers: Tech Note
  • Files: TRIS
  • Created Date: Jul 15 1975 12:00AM