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Leaching of Warm-Pressed CsZp-Cement Composite Waste Forms

Published online by Cambridge University Press:  26 February 2011

Wei Fajun,
Michael W. Grutzeck and
Della M. Roy
Wei Fajun
Affiliation:
Materials Research Laboratory, The Pennsylvania State University, University Park, PA 16802
Michael W. Grutzeck
Affiliation:
Materials Research Laboratory, The Pennsylvania State University, University Park, PA 16802
Della M. Roy
Affiliation:
Materials Research Laboratory, The Pennsylvania State University, University Park, PA 16802
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Abstract

Cesium zirconium phosphate [CsZr2 (PO4)3 or CsZP] has been mixed with various cement matrix materials, warm pressed, cured and leached at different temperatures. Although hydrated portland cement minerals can immobilize most of U, La and Nd (as proxies for transuranics) they are less effective in immobilizing Cs, Sr or Ba under ordinary conditions. Earlier published work showed favorable immobilization of Cs in CsZP-cement composite waste forms which compared rather favorably with many other waste forms with respect to Cs leachability. By using warm pressing combined with suitable admixtures rates of 28 to 60 day Cs leachability or the composites have been substantially reduced, attaining values of less than 0.20 g/m2. d.

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References

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