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Stability of Cs-Ionsiv in Portland cement blends for radioactive waste disposal

Published online by Cambridge University Press:  01 February 2011

Neil Christian Hyatt ,
Andreas Jenni  and
Martin Christopher Stennett
Neil Christian Hyatt
Affiliation:
n.c.hyatt@shef.ac.uk, The University of Sheffield, Engineering Materials, Mappin Street, Sheffield, Sheffield, South Yorkshire, S1 3JD, United Kingdom, +44 (0)114 2225504, +44 (0)114 2225943
Andreas Jenni
Affiliation:
andreas.jenni@geo.unibe.ch, University of Bern, Institute of Geological Sciences, Bern, Switzerland
Martin Christopher Stennett
Affiliation:
m.c.stennett@shef.ac.uk, The University of Sheffield, Engineering Materials, Mappin Street, Sheffield, Sheffield, South Yorkshire, S1 3JD, United Kingdom, +44 (0)114 2225504, +44 (0)114 2225943
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Abstract

The suitability of Portland cement blends for encapsulation of Cs-Ionsiv in a monolithic wasteform was investigated. No evidence of reaction or dissolution of the Cs-Ionsiv in the cementitious environment was found by scanning electron microscopy and X-ray diffraction. However, a small fraction (≤1.6 wt%) of the Cs inventory was released from the encapsulated Ionsiv during leaching experiments carried out on hydrated samples. Cs release was enhanced by exchange of K and Na present in the cementitious pore water. Cement systems lower in K and Na, such as slag based blends, showed lower Cs release than the fly ash based analogues.

Keywords

ceramicion-exchange materialnuclear materials
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1265: Symposium AA – Scientific Basis for Nuclear Waste Management XXXIV , 2010 , 1265-AA06-06
Copyright
Copyright © Materials Research Society 2010

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