New analytical method for investigating the “internal” particle size distributions of multi-composite cements
J. Unseld, A. Wolter, Institute of Non-Metallic Materials, TU Clausthal, Clausthal-Zellerfeld, Germany
The results of previous studies show that the reference method for quantitative determination of the internal particle size distribution (PSD) are already adequate for analyzing the majority of the types of cement produced in Germany. The separation procedure has been impressively validated using the example of two industrially produced CEM II/B-M (S-LL) cements. Research work into the inclusion of all permissible main constituents is in progress. The main innovative process step in the quantitative reference method is the vacuum calcination at temperatures around 600 °C that allows the limestone fraction in the cement to be removed without upsetting the PSD. A channel wheel separator can be used for the plant method although the time required for the classifying and cleaning still seems too long. Alternative methods of classifying are being tested.
Summary CEMENT INTERNATIONAL 06/2016 pp 60-66
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