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IS 12803:1989 is the Indian Standard (BIS) for methods of analysis of hydraulic cement by x-ray fluorescence spectrometer. 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
Overview
Status
Current
Usage level
Specialized
Domain
Materials Science — Cement, Concrete, Aggregates and RCC
! 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.
Standard Test Methods for Chemical Analysis of Hydraulic Cement
Provides multiple methods for cement analysis, with X-Ray Fluorescence (XRF) being a principal and detailed method.
EN 196-2:2013CEN (European Committee for Standardization), Europe
HighCurrent
Methods of testing cement - Part 2: Chemical analysis of cement
Specifies XRF as the reference method for determining the content of major elements in various types of cement.
ISO 29581-2:2010ISO (International Organization for Standardization), International
HighCurrent
Cement - Test methods - Part 2: Chemical analysis by X-ray fluorescence
Dedicated entirely to the XRF method for chemical analysis of cement, covering sample prep, calibration, and calculation.
JIS R 5202:2017JSA (Japanese Standards Association), Japan
MediumCurrent
Methods for chemical analysis of cement
Covers chemical analysis of cement, including XRF as one of the accepted instrumental methods alongside wet chemistry.
Key Differences
≠IS 12803:1989 is less prescriptive about matrix correction algorithms. Modern standards like ASTM C114 explicitly detail the use and validation of mathematical corrections (e.g., fundamental parameters, influence coefficients) to improve accuracy.
≠The Indian standard provides general guidance, while modern standards like EN 196-2 and ASTM C114 specify strict performance criteria, including mandatory limits for repeatability and reproducibility for each major oxide.
≠IS 12803 primarily details the fused bead technique. ASTM C114 and other standards provide detailed procedures and performance requirements for both fused bead and pressed powder pellet methods, offering more flexibility.
≠The range of analytes explicitly covered and qualified in newer standards is broader, often including minor oxides like TiO2, P2O5, Mn2O3, and SrO with specific performance requirements, which are not as detailed in the 1989 Indian standard.
Key Similarities
≈All standards are based on the same fundamental principle of wavelength-dispersive or energy-dispersive X-ray fluorescence spectrometry to measure elemental concentrations.
≈The use of the fused bead sample preparation method, involving fusion with a lithium borate flux, is a common and often preferred technique across all standards to eliminate mineralogical and particle size effects.
≈All standards mandate the calibration of the spectrometer using certified reference materials (CRMs) or well-characterized in-house secondary standards to ensure the traceability and accuracy of results.
≈The primary objective for all standards is the quantitative determination of the same major rock-forming oxides (CaO, SiO2, Al2O3, Fe2O3, MgO, SO3, K2O, Na2O) that define the chemical composition of hydraulic cement.
Parameter Comparison
Parameter
IS Value
International
Source
Primary Sample Preparation Method
Fused bead method using borate flux.
Fused bead is the reference method; pressed powder is an alternative method.
EN 196-2:2013
Repeatability Limit for SiO2 (%)
Not explicitly specified as a numerical limit.
Maximum deviation of 0.16 % absolute between two results.
ASTM C114-18
Repeatability Limit for CaO (%)
Not explicitly specified as a numerical limit.
Maximum deviation of 0.20 % absolute between two results.
ASTM C114-18
Calculation Basis
Results can be reported on an 'as received' or 'ignited' basis, which must be stated.
Results are typically calculated and reported on an ignited basis after determining Loss on Ignition (LOI).
ASTM C114-18
Flux Composition
Lithium tetraborate or a mixture with lithium metaborate is recommended.
Specifies lithium borate fluxes, often pre-fused mixtures with defined tetraborate/metaborate ratios.
ISO 29581-2:2010
Typical Sample-to-Flux Ratio
Guidance suggests ratios from 1:5 to 1:10.
Specifies a controlled sample-to-flux ratio, often around 1:10 (e.g., 1.0g sample to 10.0g flux).
ASTM C114-18
⚠ Verify details from original standards before use
Key Values6
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.