Three models, mori-minegishi, ginstling-brounshtein, and a nucleation and growth model were analysed in order to investigate the conversion of hemihydrate to gypsum, and ettringite formation in the system c3a-caso4.1/2 h2o-h20 at three hydration temperatures. Analysis of the kinetics of gypsum formation suggests that the rate limiting step changes from an initial dependence on the hemihydrate surface area to a dependence on the gypsum growth rate. The formation of ettringite was found to be controlled by diffusion. In accord with the needle-like morphology that ettringite exhibits, a nucleation and growth model predicted one-dimensional growth. An apparent activation energy calculated for ettringite formation is consistent with a diffusionally controlled process.

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  • Corporate Authors:

    Pergamon Press, Incorporated

    Maxwell House, Fairview Park
    Elmsford, NY  United States  10523
  • Authors:
    • Brown, P W
    • La Croix, P
  • Publication Date: 1989-11


  • English

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Filing Info

  • Accession Number: 00498866
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Sep 30 1990 12:00AM