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|Title:||Detection of calcium sulfates and magnesium oxide in fly ash by x-ray diffraction|
|Authors:||United States. Assistant Secretary of the Army (R & D).|
Wong, G. Sam.
Buck, Alan D.
|Publisher:||Concrete Laboratory (U.S.)|
Engineer Research and Development Center (U.S.)
|Series/Report no.:||Miscellaneous paper (U.S. Army Engineer Waterways Experiment Station) ; C-76-5.|
Abstract: It was suspected that processes used to reduce the sulfur content of flue gases at coal burning power plants might introduce undesirable amounts of calcium sulfates or other constituents into the fly ash collected for use as an ingredient of concrete. A procedure was developed to detect rapidly by quantitative X-ray diffraction the presence and amount of magnesium oxide (periclase) or calcium sulfate (anhydrite) in fly ash. This procedure was found to be capable of detecting these constituents in amounts as low as 0.25 percent by weight. Samples of material collected at six power plants using each of three flue gas desulf'urization processes were examined. They all were found to contain calcium sulfate and all but one contained calcium sulfite. The constituents could be undesirable in material being added to portland-cement concrete if present in significant amounts.
|Rights:||Approved for public release; distribution is unlimited.|
|Appears in Collections:||Miscellaneous Paper|