Quantitative measurements of fly ash, slag, and cement in limestone-based blends by Fourier transform infrared-attenuated total reflectance method

Conference · Fri Feb 01 00:00:00 EST 1991

OSTI ID:5881306

Rebagay, T V; Dodd, D A; Claghorn, R D; Voogd, J A

The disposal of the low-level radioactive liquids involves mixing the liquid waste with pozzolanic blend to form grout. Since the long-term performance of the grout depends on the composition of the blend, a rapid and reliable quantitative method to monitor blend compositions is needed. Earlier studies by Westinghouse Hanford Company demonstrated the utility of a Fourier transform infrared-attenuated total reflectance method for the analysis of cement blends. A sequential spectral subtraction technique was used to analyze the blend; however, its reproducibility depends on the operator's skill to perform spectral subtractions. A partial-least-squares (PLS) algorithm has replaced spectral subtraction. The PLS method is a statistical quantitative method suitable for analysis of multicomponent systems. Calibration blends are prepared by mixing the blend components in various proportions following a carefully designed calibration model. For the model, limestone content ranges from 30-50 wt%; blast furnace slag from 18-38 wt%; fly ash from 18-38 wt%; and cement from 0-16 wt%. Use of the large concentration range will enhance the chance that the calibration will be useful when target concentration change. The ability of the PLS method to predict limestone, slag, fly ash, and cement values in test blends was assessed. The prediction step of the PLS algorithm required only a few seconds to analyze the test spectra. The best and worst results for each component of the blends calculated by this method are shown in tables. The standard error of prediction of the true value is <2 wt% for limestone, <4 wt% for both fly ash and blast furnace slag, and <10 wt% for cement. 2 refs., 8 figs., 7 tabs.

• Research Organization: Westinghouse Hanford Co., Richland, WA (USA)
• Sponsoring Organization: USDOE; USDOE, Washington, DC (USA)
• DOE Contract Number: AC06-87RL10930
• OSTI ID: 5881306
• Report Number(s): WHC-SA-0975; CONF-910311-2; ON: DE91011062; TRN: 91-015036
• Resource Relation: Conference: 42. Pittsburgh conference and exposition on analytical chemistry and applied spectroscopy, Chicago, IL (USA), 4-8 Mar 1991
• Country of Publication: United States
• Language: English

Related Subjects

12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
01 COAL, LIGNITE, AND PEAT
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
CEMENTS
CHEMICAL ANALYSIS
FLY ASH
WASTE PRODUCT UTILIZATION
LOW-LEVEL RADIOACTIVE WASTES
STABILIZATION
SLAGS
ACCURACY
ALGORITHMS
BLAST FURNACES
CALIBRATION
CHEMICAL COMPOSITION
DATA ANALYSIS
EVALUATION
FOURIER TRANSFORM SPECTROMETERS
GROUTING
HANFORD ENGINEERING DEVELOPMENT LABORATORY
INFRARED RADIATION
LEAST SQUARE FIT
LIMESTONE
MONITORING
PERFORMANCE
QUANTITY RATIO
RADIOACTIVE EFFLUENTS
RADIOACTIVE WASTE MANAGEMENT
REFLECTIVITY
SPECTROSCOPY
AEROSOL WASTES
ASHES
BUILDING MATERIALS
CARBONATE ROCKS
ELECTROMAGNETIC RADIATION
FURNACES
MANAGEMENT
MATERIALS
MATHEMATICAL LOGIC
MAXIMUM-LIKELIHOOD FIT
MEASURING INSTRUMENTS
NATIONAL ORGANIZATIONS
NUMERICAL SOLUTION
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
RADIATIONS
RADIOACTIVE MATERIALS
RADIOACTIVE WASTES
RESIDUES
ROCKS
SEDIMENTARY ROCKS
SPECTROMETERS
SURFACE PROPERTIES
US DOE
US ORGANIZATIONS
WASTE MANAGEMENT
WASTES
052002* - Nuclear Fuels- Waste Disposal &amp; Storage
010800 - Coal
Lignite
&amp; Peat- Waste Management
400102 - Chemical &amp; Spectral Procedures