The Contribution of Class-F Fly Ash to the Strength of Cementitious Mixtures

This article reports on a study that investigated the contribution of class-F fly ash to the strength of cementitious mixtures. The authors note that the chemical contribution to the overall structure development of high performance concrete (HPC), to which fly ash is typically added, has not been fully understood because of the masking of its hydration products by those of cement. In a mixture of class-F fly ash and lime (Ca/Si=2), portlandite diminishes and C4AH13 forms due to addition of Al to solution. The latter converts to hydrogarnet and C3ASH4. C-S-H (calcium silicate hydrate) is detected at 3 days and continues to increase in intensity. The presence of Al as approximately one-fifth of the Si in a chain length of 10 units suggests that Al tetrahedra may be present in bridging positions. The authors used x-ray diffraction at various ages where the changes in phase composition were studied.

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  • Authors:
    • Malek, R I
    • Khalil, Z H
    • Imbaby, S S
    • Roy, D M
  • Publication Date: 2005-6

Language

  • English

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Filing Info

  • Accession Number: 01002966
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Aug 3 2005 10:50AM