Physical barrier effect of geopolymeric waste form on diffusivity of cesium and strontium

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The present study investigates the physical barrier effect of geopolymeric waste form on leaching behavior of cesium and strontium. Fly ash-based geopolymers and slag-blended geopolymers were used as solidification agents. The leaching behavior of cesium and strontium from geopolymers was evaluated in accordance with ANSI/ANS-16.1. The diffusivity of cesium and strontium in a fly ash-based geopolymer was lower than that in Portland cement by a factor of 103 and 104, respectively, showing significantly improved immobilization performance. The leaching resistance of fly ash-based geopolymer was relatively constant regardless of the type of fly ash. The diffusivity of water-soluble cesium and strontium ions were highly correlated with the critical pore diameter of the binder. The critical pore diameter of the fly ash-based geopolymer was remarkably smaller than those of Portland cement and slag-blended geopolymer; consequently, its ability physically to retard the diffusion of nuclides (physical barrier effect) was superior. (C) 2016 Elsevier B.V. All rights reserved
Publisher
ELSEVIER SCIENCE BV
Issue Date
2016-11
Language
English
Article Type
Article
Citation

JOURNAL OF HAZARDOUS MATERIALS, v.318, pp.339 - 346

ISSN
0304-3894
DOI
10.1016/j.jhazmat.2016.07.003
URI
http://hdl.handle.net/10203/213479
Appears in Collection
CE-Journal Papers(저널논문)
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