Microstructural aspects of zeolite formation in alkali activated cements containing high levels of fly ash

Conference · Tue Jan 31 23:00:00 EST 1995

OSTI ID:46615

Kruger, A A ^[1]; Brough, A R; Katz, A; Bakharev, T; Sun, G K; Kirkpatrick, R J; Struble, L J; Young, J F ^[2]

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1. Westinghouse Hanford Co., Richland, WA (United States)
2. Univ. of Illinois, Urbana, IL (United States). Center for Advanced Cement Based Materials

Wasteforms made by reaction at elevated temperature of a highly e simulated low level nuclear waste solution, having high sodium ion concentration, with a cementitious blend high in fly ash have been studied. Significant formation of Na-P1 zeolite (gismondine framework) and of a sodalite occurred. The time evolution of the crystalline phases over the first 28 days is reported for both adiabatic and isothermal curing, and the role of these phases in microstructure development is discussed. The level of carbonate ions in solution was found to have a substantial effect on strength evolution and chemistry.

• Research Organization: Westinghouse Hanford Co., Richland, WA (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: AC06-87RL10930
• OSTI ID: 46615
• Report Number(s): WHC-SA--2676; CONF-941144--122; ON: DE95010107
• Country of Publication: United States
• Language: English

Related Subjects

05 NUCLEAR FUELS
36 MATERIALS SCIENCE
CALORIMETRY
CEMENTS
CHEMICAL COMPOSITION
COMPRESSION STRENGTH
FLY ASH
LOW-LEVEL RADIOACTIVE WASTES
MICROSTRUCTURE
PHASE STUDIES
PHASE TRANSFORMATIONS
RADIOACTIVE WASTE DISPOSAL
SCANNING ELECTRON MICROSCOPY
SOLIDIFICATION
WASTE FORMS
WASTE PRODUCT UTILIZATION
X-RAY DIFFRACTION
ZEOLITES