LIMITATIONS OF THE CARBONATE EXTRACTION/UV SPECTROPHOTOMETRIC METHOD FOR DETERMINING LIGNOSULFONATE-BASED ADMIXTURES IN HARDENED CONCRETE

The most common method for determining lignosulfonate addition rates in portland cements involves extraction of lignosulfonate derivatives from pulverized concrete with an alkali-carbonate solution. The concentration of the extracted derivatives is then measured by comparing their ultraviolet (UV) spectra with those obtained from appropriate concrete standards. This widely accepted method has numerous limitations, though, when investigating concrete performance problems. Among the factors that may affect the results of the carbonate extraction/UV spectrophotometric procedure are the source of lignosulfonate in the admixture, cement content, concrete maturity, and certain extractable constituents, such as other admixtures, cement additives, organics from fly ash, and unknown constituents. This paper presents a discussion on the results of systematic studies that have been conducted to determine how each of these variables can impact the accuracy of results obtained.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/oclc/3528769
• 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:
  • Sanders Jr, C I
  • Sadeghi, S S
  • Nelson, N L
• Conference:
  • Symposium on Determination of the Chemical and Mineral Admixture Content of Hardened Concrete
  • Location: Montreal, Quebec, CANADA
  • Date: 1994-6-20 to 1994-6-20
• Publication Date: 1995-6

Language

• English

Media Info

• Features: Appendices; Figures; References; Tables;
• Pagination: p. 37-47
• Serial:
  • Cement, Concrete and Aggregates
  • Volume: 17
  • Issue Number: 1
  • Publisher: American Society for Testing and Materials (ASTM)
  • ISSN: 0149-6123
  • Serial URL: http://journalsip.astm.org/JOURNALS/CEMENT/cca_home.html

Subject/Index Terms

• TRT Terms: Admixtures; Concrete; Lignin; Lignosulfonate; Methodology; Spectrophotometry; Ultraviolet radiation
• Uncontrolled Terms: Limitations
• Subject Areas: Highways; Materials; I32: Concrete;

Filing Info

• Accession Number: 00715286
• Record Type: Publication
• Files: TRIS
• Created Date: Jan 1 1996 12:00AM