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Certification of SRM 114q: Part II



Chiara F. Ferraris, Max A. Peltz, William F. Guthrie, A Aviles, Robin K. Haupt, Bruce S. MacDonald


The standard reference material (SRM) for fineness of cement, SRM 114, is an integral part of the calibration material routinely used in the cement industry to qualify cements. Being a powder, the main physical properties of cement, prior to hydration, are its surface area and particle size distribution (PSD). Since 1934, NIST has provided SRM 114 for cement fineness and it will continue to do so as long as the industry requires it. Different lots of SRM 114 are designated by a unique letter suffix to the SRM number, e.g., 114a, 114b, . ,114q. A certificate that gives the values obtained using ASTM C204 (Blaine), C115 (Wagner) and C430 (45 ?m sieve residue) is included with each lot of the material. For the SRM 114p an addendum was developed proving the PSD curve in 2003. The supply of SRM 114p, which was released in 1994, was depleted in 2004. Therefore, a new batch of SRM 114 needed to be developed. This process included selection of the cement, packaging the cement in small vials, and determination of the values for the ASTM tests reported. In Certification of SRM 114q: Part I (SP26-161), the development of the values for the ASTM C204 (Blaine), C115 (Wagner) and C430 (45 ?m sieve residue) were discussed. In this report, the establishment of the PSD for SRM 114q is presented. The development of the PSD in this report was based on the light scattering technology (or as it is commonly referred to laser diffraction (LAS)). Other methods could be used to develop the PSD of cement but after two round robins and a survey, there were not enough data by other methods to allow a statistically valid calculation of the mean PSD. The purpose of this report is to complement the description of the process to certify SRM 114q described in Part I. All measurements used for the development of the PSD reference curve are provided along with descriptions of the statistical analyses.
Special Publication (NIST SP) - 260-166
Report Number


cement fineness, laser diffraction, particle size distribution


Ferraris, C. , Peltz, M. , Guthrie, W. , Aviles, A. , Haupt, R. and MacDonald, B. (2006), Certification of SRM 114q: Part II, Special Publication (NIST SP), National Institute of Standards and Technology, Gaithersburg, MD, [online], (Accessed March 2, 2024)
Created June 14, 2006, Updated November 10, 2018