Comparison of Two Metakaolins and a Silica Fume Used as Supplementary Cementitious Materials

The performance of two metakaolins as supplementary cementitious materials (SCMs) were evaluated at 8% by weight cement replacement. The metakaolins varied by their surface area. Performance of metakaolin mixtures was compared to control measures at water-to-cement ratios of 0.40, 0.50, and 0.60 where no SCM has been used and to mixtures where silica fume had been used as partial replacement for cement. In both mixtures containing metakaolins, compressive, splitting tensile, and flexural strengths increased, as well as elastic modulus, as compared to control mixtures. Setting time was reduced in the pastes with both metakaolins. Additionally, considering durability, both metakaolins reduced rapid chloride ion permeability and expansion due to alkali-silica reaction when compared to control and silica fume mixtures. In general, the finer of the two metakaolins proved more effective in improving concrete properties, although both performed superior to silica fume.

Language

  • English

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 213-235
  • Monograph Title: Seventh International Symposium on the Utilization of High Strength/High-Performance Concrete
  • Serial:
    • Volume: 1 & 2

Subject/Index Terms

Filing Info

  • Accession Number: 01004571
  • Record Type: Publication
  • ISBN: 0870311808
  • Files: TRIS
  • Created Date: Sep 30 2005 11:03AM