Abstract
THE hardening process by which a cement is formed from a polycrystalline matrix has been investigated using a cement of relatively simple composition and structure—Sorel cement1. This cement is formed by the addition of magnesium chloride solution to a fine powder of magnesium oxide2. The viscous paste hardens on drying and sets to a cement consisting of a mass of needle-like crystals of Mg3(OH)2Cl.4H2O. The appearance of the cement is shown in Fig. 1, which was taken with a scanning electron microscope (by A. Rezanowich and I. Frazer at the Pulp and Paper Research Institute, Montreal).
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References
Sorel, S. T., C.R. Acad. Sci., Paris, 65, 102 (1867).
Fink, G. J., Kirk-Othmer Encyclopedia of Chemical Technology, 3, 435 (1953). Taylor, H. F. W., The Chemistry of Cements (Academic Press, New York, 1964).
See Bacon, R., in Growth and Perfection of Crystals, edit. by Doremus, R. H., 197 (Wiley, New York, 1958). Nabarro, F. R. N., and Jackson, P. J., ibid., 77.
DeWolff, P. M., and Walter-Levy, L., Acta Cryst., 6, 40 (1953).
Brunauer, S., and Copeland, L. E., Sci. Amer., 210, No. 4, 81 (1964).
Jones, T. P., and Mooney, B., Nature, 207, 752 (1965).
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TOOPER, B., CARTZ, L. Structure and Formation of Magnesium Oxychloride Sorel Cements. Nature 211, 64–66 (1966). https://doi.org/10.1038/211064a0
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DOI: https://doi.org/10.1038/211064a0
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