Abstract
THE initial thickening of slurries of hemi-hydrate type gypsum plasters has been considered by many workers to be due to a colloidal mechanism, whereas the further hardening and final setting have always been attributed to a crystallization process. Recent work supporting the colloidal theory is that of Fischer1, while still later Becherer and Fiedler2 have attributed the initial thickening of plaster slurries to the action of capillary forces causing a packing together of hemi-hydrate particles.
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References
Fischer, H. C., A.S.T.M. Bull., No. 192, 43 (Sept. 1953).
Becherer, G., and Fiedler, H., Silikat Technik, 6, 292 (1955).
Standards Association of Australia, Interim. Spec. 317 for Gypsum Plaster Hemi-hydrate Type (Sept. 1949).
Neville, H. A., J. Phys. Chem., 30, 1037 (1926).
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POWELL, D. Setting of Gypsum Plaster. Nature 178, 428–429 (1956). https://doi.org/10.1038/178428b0
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DOI: https://doi.org/10.1038/178428b0
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