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The ASTM methods for the determination of surface area of portland cement are reviewed. The Blaine air-permeability method is rapid and probably relatively accurate, but does not provide particle size distribution data. The Wagner turbidimetric method does provide such data, but the data for the finer size ranges are erroneous. Procedures for the improvement of the Wagner data are outlined, and it is suggested that the analyses by the Wagner, or any other method, need not be very accurate. Overestimation of certain size fractions and underestimation of others may actually provide data of increased specification value.
fineness, Blaine test, Wagner test, cements, surface area, specific surface, particle size distribution, permeability, turbidimetry, tests
Manager, Chemical and Petrographic Research Section, Portland Cement Assn., Skokie, Ill.