DEVELOPMENT OF MICROSTRUCTURE AND OTHER PROPERTIES IN FLYASH OPC SYSTEMS

A recent review concluded that low calcium flyash does not show a large enough pozzolanic activity in opc to affect strength until about two weeks after hydration. This paper compares the development of microstructure and of strength for different op cements with similar low calcium flyashes. Ordinary portland cements and flyash blend cements containing 30% of flyash were cast at room temperature with a w/s ratio of 0.45-0.47. The Ca (OH) 2 content and compressive strength were measured at several ages. In the flyash-cement systems the Ca(OH)2 content reached a maximum value after 7-14 days thereafter decreasing as a result of pozzolanic reaction. This decrease in Ca(OH)2 content followed dissolution of the flyash surfaces and the augmentation of strength by the flyash. (TRRL)

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  • Corporate Authors:

    Pergamon Press, Incorporated

    Maxwell House, Fairview Park
    Elmsford, NY  United States  10523
  • Authors:
    • Halse, Y
    • Pratt, P L
    • DALZIEL, J A
    • Gutteridge, W A
  • Publication Date: 1984-7

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Filing Info

  • Accession Number: 00393264
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD, TRIS
  • Created Date: Jun 30 1985 12:00AM