MINERALOGY AND PERFORMANCE OF CEMENT BASED ON HIGH SULFATE CLINKER

The question of whether or not the release of sulfates from the clinker phases of portland cement can result in late or renewed ettringite formation has been addressed through a series of physical tests and by mineralogical examination. The cements tested contained clinker with SO3 contents ranging up to 3%, including high belite contents and sufficiently low alkali contents to ensure the presence of anhydrite. The physical testing consisted of expansion tests of mortars cured and stored at 20 deg C, in addition to compressive strength determinations. The mineralogical examination consisted of monitoring the consumption of anhydrous phases by x-ray diffraction and microscopy on the scanning electron microscope. Linear expansion at 10 months was negligible for all cements with no significant loss in strength. No significant late or renewed development of ettringite was observed. Calculations based on the distribution of elements between phases in the clinker included in the investigation show that the potential for late ettringite formation from the unreacted clinker is negligible, even when making the most pessimistic assumptions.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/oclc/3528769
• Supplemental Notes:
  • This paper was presented at the American Society for Testing and Materials (ASTM) Symposium on Internal Sulfate Attack on Cementitious Systems. The symposium was held in San Diego, California, in conjunction with the December 7-12, 1997, standards development meetings of ASTM Committees C-1 and C-9, the symposium sponsors.
• 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:
  • Herfort, D
  • RASMUSSEN, S
  • Jons, E
  • Osbaeck, B
• Publication Date: 1999-6

Language

• English

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 64-72
• Serial:
  • Cement, Concrete and Aggregates
  • Volume: 21
  • 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: Alkali; Cement mortars; Clinkers; Compressive strength; Concrete curing; Diffraction; Electron microscopy; Ettringite; Expansion; Mineralogy; Monitoring; Portland cement; Sulfate resisting cement; Sulfates; X ray analysis
• Uncontrolled Terms: Anhydrite
• Subject Areas: Highways; Materials; I32: Concrete;

Filing Info

• Accession Number: 00781601
• Record Type: Publication
• Contract Numbers: 4-19, 96-08
• Files: TRIS
• Created Date: Jan 3 2000 12:00AM