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 (ASTM)

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

Media Info

• Features: References; Tables;
• Pagination: p. 208-210
• Serial:
  • ASTM Journal of Testing and Evaluation
  • Volume: 3
  • Issue Number: 3
  • Publisher: Federal Highway Administration

Subject/Index Terms

• TRT Terms: Cement paste; Chloride content; Concrete hardening; Mortar; Portland cement; Volumetric analysis
• Uncontrolled Terms: Hardened concrete
• Subject Areas: Highways; Materials;

Filing Info

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