This standard details the instrumental method for the chemical analysis of hydraulic cement using an X-ray fluorescence (XRF) spectrometer. It provides a rapid and precise procedure for determining the percentage of major constituent oxides like lime, silica, alumina, and iron oxide. The method is a key tool for quality control in cement manufacturing.
Methods of analysis of hydraulic cement by X-ray fluorescence spectrometer
Quick Reference Values
Analysis component 1Silicon dioxide (SiO2)
Analysis component 2Aluminium oxide (Al2O3)
Analysis component 3Ferric oxide (Fe2O3)
Analysis component 4Calcium oxide (CaO)
Analysis component 5Magnesium oxide (MgO)
Analysis component 6Sulphuric anhydride (SO3)
Key Formulas
C = mI + b — General formula for calculating concentration (C) from X-ray intensity (I) using a calibration curve.
Practical Notes
The XRF method described here is significantly faster than the traditional wet chemical analysis detailed in IS 4032, making it suitable for routine process control.
Accurate results are highly dependent on the quality of calibration using certified standard reference materials (SRMs) and proper sample preparation (e.g., fused beads or pressed pellets).
In case of any dispute over test results, the wet chemical methods prescribed in IS 4032 are considered the referee methods.