This paper investigates the hydration of mixtures of monocalcium aluminate (ca) with ground granulated blastfurnace slag (gbfs) to ascertain whether the loss of strength normally associated with hydration in calcium aluminate cements may be mitigated by the addition of 'cemsave' blastfurnace slag. Samples of 5g of a 1:1 (by mass) ca/gbfs mixture was hydrated at 4, 20 and 40 degrees centrigrade in a wexham developments jaf conduction calorimeter using decarbonated distilled water with a water solid (w/s) ratio of 0.4. Data were collected and processed on a microcomputer. Quantitative x-ray diffraction analysis (qxda) was used to measure the amounts of ca and ca hydrates (cah10; c2ah8; c3ah6 and c2ash8) present at various stages of the hydration. The initial products were calcium aluminium hydrates, but after a period of months crystalline hydrates containing silica were observed. This indicated the involvement of slag in the overall hydration reaction. It is suggested that these results show that the addition of slag will mitigate loss of strength in ca cements due to hydration.

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    Pergamon Press, Incorporated

    Maxwell House, Fairview Park
    Elmsford, NY  United States  10523
  • Authors:
    • Edmonds, R N
    • Majumdar, A J
  • Publication Date: 1989-9


  • English

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  • Accession Number: 00498109
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Sep 30 1990 12:00AM