Accession Number:

AD0673692

Title:

X-RAY EMISSION ANALYSIS OF PORTLAND CEMENT. REPORT 1. VARIANCES IN ANALYSIS,

Descriptive Note:

Corporate Author:

ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MISS

Personal Author(s):

Report Date:

1968-07-01

Pagination or Media Count:

30.0

Abstract:

A balanced statistical experiment was conducted to evaluate the effect of four factors on the X-ray emission analysis for calcium Ca, silicon Si, iron Fe, aluminum Al, magnesium Mg, and sulfur S in portland cement. The factors evaluated were instrument conditions optimized versus predetermined goniometer and counter-tube voltage settings rounds binders used to aid in grinding and pelletizing the cement boric acid, sodium lauryl sulfate, Boraxo, and a Boraxo-cellulose mixture and the sample pellet-making procedure. The experimental results indicate that pellets have a direct effect on the analysis of portland cement. Binders were found to have a direct effect on the elemental analyses, and the effect was determined to be due to sodium lauryl sulfate. However, the effect is negated by the use of a ratio method of analysis. Instrument conditions and rounds were both found to have an effect on the analytical results either as direct factors or in the form of interactions, particularly the interaction of pellets and rounds. The precision of the X-ray analysis is apparently increased when optimized instrument settings are used. Either sodium lauryl sulfate or Boraxo may be used as a binder for X-ray emission analysis. One one pellet need be made with each sample. A replicate analysis will confound the pellet-round interaction with round variances, and the pellet effect will be confounded between samples. The decision as to whether the spectrometer is to be tuned prior to every analysis is deferred until the spectrometer calibration results are evaluated. Author

Subject Categories:

  • Inorganic Chemistry
  • Ceramics, Refractories and Glass

Distribution Statement:

APPROVED FOR PUBLIC RELEASE