Interaction between BaCO{sub 3} and OPC/BFS composite cements at 20 {sup o}C and 60 {sup o}C

Journal Article · Tue Mar 15 00:00:00 EDT 2011 · Cement and Concrete Research

DOI:https://doi.org/10.1016/j.cemconres.2010.11.006· OSTI ID:21504013

Gallucci, E ^[1]; Hill, J ^[2]; Milestone, N B ^[3]

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1. Ecole Polytechnique Federale de Lausanne, Laboratory of Construction Materials, CH-1015 Lausanne (Switzerland)
2. AMEC NNC Ltd, Birchwood, Cheshire, WA3 6GN (United Kingdom)
3. University of Sheffield, Immobilisation Science Laboratory, Department of Materials Science and Engineering, Mappin Street, Sheffield S1 3JD (United Kingdom)

A BaCO{sub 3} slurry, containing radioactive {sup 14}C, is produced during the reprocessing of spent nuclear fuel. This slurry is encapsulated in a Portland-blastfurnace slag composite cement. The effect of BaCO{sub 3} on the hydration of OPC and Portland-blastfurnace slag cements has been studied in this work. Samples containing a simulant BaCO{sub 3} slurry were cured for up to 720 days at 20 and 60 {sup o}C and analysed by XRD, SEM(EDX) and ICC. BaCO{sub 3} reacted with OPC to precipitate BaSO{sub 4} from a reaction between soluble sulfate and BaCO{sub 3}. Calcium monocarboaluminate subsequently formed from the carbonate released. The monocarboaluminate precipitated as crystals in voids formed during hydration. At 60 {sup o}C in OPC, it was not identified by XRD, suggesting the phase is unstable in this system around this temperature. In the Portland-blastfurnace slag cements containing BaCO{sub 3}, less monocarboaluminate and BaSO{sub 4} were formed, but the hydration of BFS was promoted and monocarboaluminate was stable up to 60 {sup o}C.

• OSTI ID: 21504013
• Journal Information: Cement and Concrete Research, Vol. 41, Issue 3; Other Information: DOI: 10.1016/j.cemconres.2010.11.006; PII: S0008-8846(10)00249-8; Copyright (c) 2010 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; ISSN 0008-8846
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
BARIUM CARBONATES
BARIUM SULFATES
CARBON 14
CEMENTS
CRYSTALS
HYDRATION
INTERACTIONS
PRECIPITATION
RADIOACTIVE WASTE MANAGEMENT
RADIOACTIVE WASTES
REPROCESSING
SCANNING ELECTRON MICROSCOPY
SLAGS
SLURRIES
SPENT FUELS
TEMPERATURE RANGE 0273-0400 K
X-RAY DIFFRACTION
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BUILDING MATERIALS
CARBON COMPOUNDS
CARBON ISOTOPES
CARBONATES
COHERENT SCATTERING
DIFFRACTION
DISPERSIONS
ELECTRON MICROSCOPY
ENERGY SOURCES
EVEN-EVEN NUCLEI
FUELS
ISOTOPES
LIGHT NUCLEI
MANAGEMENT
MATERIALS
MICROSCOPY
MIXTURES
NUCLEAR FUELS
NUCLEI
OXYGEN COMPOUNDS
RADIOACTIVE MATERIALS
RADIOISOTOPES
REACTOR MATERIALS
SCATTERING
SEPARATION PROCESSES
SOLVATION
SULFATES
SULFUR COMPOUNDS
SUSPENSIONS
TEMPERATURE RANGE
WASTE MANAGEMENT
WASTES
YEARS LIVING RADIOISOTOPES