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    Surface Area of Portland Cement

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    Values for the surface area of portland cements were obtained by three different methods: the Wagner turbidimeter, air permeability, and a statistical calculation based on size-distribution data. In the Wagner turbidimeter (1), from the change with time in transmission of a beam of light through a suspension of the material, size distribution of the material and surface area are calculated. The turbidimeter analyses were made in the laboratories of J C. Pearson, Lehigh Portland Cement Co., who also kindly supplied the cements. Redetermination of these materials in the same laboratories about a year later gave surface area values that were consistently lower by about 5 per cent; we have taken for comparison the original values as being probably the more accurate.

    Author Information:

    Roller, Paul S.
    Physical Chemist, Eastern Experiment Station, U. S. Bureau of Mines, College Park, Md

    Roundy, P. V.
    Cooperative Fellow, American Instrument Co., Silver Spring, Md

    Committee/Subcommittee: E01.21

    DOI: 10.1520/STP43895S