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The setting of gypsum plaster

Part I The hydration of calcium sulphate hemihydrate

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Abstract

The α- and Β-forms of calcium sulphate hemihydrate, CaSO4·1/2H2O, were characterized using thermal, X-ray diffraction, optical and electron microscopy techniques. The differences between the two forms arose from their mode of production, resulting in different crystal size and habit, and not from different crystal structures. The hydration of CaSO4·1/2H2O to CaSO4·2H2O was investigated using calorimetry, phase analysis and the changes in electrical resistance of the plaster slurries. The reaction occurred in three steps: dissolution, nucleation and precipitation, and finally completion due to depletion of reactants. The differences in reactivity of the α- and Β-forms with water again appeared to be due to their different physical states.

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References

  1. J. BENSTEAD and S. VARMA,Cem. Technol. 3 (1972) 67.

    Google Scholar 

  2. M. J. RIDGE,Rev. Pure Appl. Chem. 10 (1960) 243.

    Google Scholar 

  3. M. J. RIDGE and M. J. BERETKA,ibid. 19 (1969) 17.

    Google Scholar 

  4. J. N. ANDERSON, “Applied Dental Materials”, 5th Edn. (Blackwell, London 1976) Ch. 20.

    Google Scholar 

  5. M. E. ENAYETALLAH, A. A. KHAIL and A. M. GADALLA,Br. Ceram. Trans. J. 76 (1977) 95.

    Google Scholar 

  6. P. LACHENY,Bull. Soc. Fr. Ceram. 76 (1967) 21.

    Google Scholar 

  7. M. GOTO, B. MOLONY, M. J. RIDGE and G. W. WEST,Aust. J. Chem. 19 (1966) 313.

    Google Scholar 

  8. H. MIYAZAKI,Shinku Kagaku 15 (1968) 113.

    Google Scholar 

  9. O. W. FLÖRKE,Neves Jb. Miner. Abh. 84 (1952) 189.

    Google Scholar 

  10. T. SAJTO,Bull. Chem. Soc. Jpn 34 (1961) 1454.

    Google Scholar 

  11. C. MITSUKI and M. KITA,Nature (Lond.) 184 (1959) 1481.

    Google Scholar 

  12. M. GOTO, B. MOLONY and M. J. RIDGE,J. Chem. Soc. A (1966) 9.

    Google Scholar 

  13. H. MIYAZAKI and S. MATSUOAKA,Osaka Koggo Gijutsu Shikenja Kiho 18 (1967) 103.

    Google Scholar 

  14. F. W. BIRSS and T. THORVALDSON,Can. J. Chem. 33 (1955) 870.

    Google Scholar 

  15. V. LUDWIG and N. B. SINGH,Cem. Concr. Res. 8 (1978) 291.

    Google Scholar 

  16. A. J. LEWRY, PhD thesis, University of London (1988).

  17. D. N. TODOR, “Thermal analysis of minerals” (Abacus, 1976) Ch. 5, p. 127.

  18. A. J. LEWRY and J. WILLIAMSON,J. Mater. Sci. 29 (1994) 0000.

    Google Scholar 

  19. “Handbook of Chemistry and Physics”, 48th Edn. (Chemical Rubber Co., Cleveland, USA, 1968) p. B-165.

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Authors and Affiliations

  1. Building Research Establishment, WD2 7JR, Watford, UK

    A. J. Lewry

  2. Department of Materials, Imperial College, SW7 2BP, London, UK

    J. Williamson

Authors
  1. A. J. Lewry
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  2. J. Williamson
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Lewry, A.J., Williamson, J. The setting of gypsum plaster. J Mater Sci 29, 5279–5284 (1994). https://doi.org/10.1007/BF01171536

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  • DOI: https://doi.org/10.1007/BF01171536

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