XRD application support cement whitepaper

Introduction

The XRD application support cement is part of Malvern Panalytical’s solution for the automated quantitative phase analysis of all types of (blended) cements, its raw materials and intermediate products such as clinker and hotmeal. Once set-up there is no user interaction required and the analyses are performed fully automatically. The methods are based on direct phase probing with X-ray diffraction (XRD) and phase analysis with Malvern Panalytical’s HighScore Plus and/or RoboRiet software.

Description of the solution

Malvern Panalytical supports mineralogical quantification methods for every type of material that is typical in the cement making process. These materials range from raw materials, intermediate compounds like hotmeal or clinker, and every type of (blended) cement. The control files for quantification contain the typical clinker and cement phases. The lists of phases are based on the EN 197-1, ASTM C150, ASTM C595 and ASTM C1157 classification norms. Additional compounds of interest can be selected on demand and Malvern Panalytical will then provide methods for the phase quantification of the chosen compounds.

The methods run with Malvern Panalytical’s HighScore Plus or RoboRiet software. The methods yield phase quantification results using Rietveld and/or Partial Least Squares Regression analyses. The results are in absolute wt-% and are written to exportable and customizable outputs compatible with Excel and most common LIMS systems. In addition, statistical analyses can be performed with a clustering technique allowing pass/fail or classification analyses. 

Quantification accuracy with XRD may be influenced by the stability of the phase, sensitivity of the phase to sample preparation (grinding in particular) and significant changes in mineralogy of the additives. For this reason, Malvern Panalytical only guarantees repeatability targets for the analytical precision of the methods.  

The analytical accuracy of Malvern Panalytical’s Aeris Cement Edition (600 and 300 Watt) XRD instruments is guaranteed using Si reference samples. The instrument tests are performed at the factory, during on-site installation and/or during maintenance.

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