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A platform for research: civil engineering, architecture and urbanism
The mechanism of cesium immobilization in densified silica-fume blended cement pastes
AbstractThe role of silica-fume agglomerates, found in densified silica-fume (DSF) pastes, in the immobilization mechanism of Cs ions was studied. Samples of cementitious pastes containing two different forms of silica fume – DSF and raw silica fume (RSF) – were prepared. Leaching experiments showed that both additives reduced the leachability of the metal ion, but the effect of the DSF paste was much stronger. Scanning Electron Microscopy, together with Differential Thermal Analysis, proved that no agglomerated particles were present in the RSF pastes and that the extent of pozzolanic reactivity was higher. We therefore believe that unreacted silica within the DSF agglomerates adsorbs Cs ions and consequently increases their immobilization. Furthermore, this work suggests that during the pozzolanic reaction, a hydrated rim develops around the agglomerate that acts as an additional diffusion barrier for the Cs ions, resulting in an increased efficiency of Cs immobilization.
The mechanism of cesium immobilization in densified silica-fume blended cement pastes
AbstractThe role of silica-fume agglomerates, found in densified silica-fume (DSF) pastes, in the immobilization mechanism of Cs ions was studied. Samples of cementitious pastes containing two different forms of silica fume – DSF and raw silica fume (RSF) – were prepared. Leaching experiments showed that both additives reduced the leachability of the metal ion, but the effect of the DSF paste was much stronger. Scanning Electron Microscopy, together with Differential Thermal Analysis, proved that no agglomerated particles were present in the RSF pastes and that the extent of pozzolanic reactivity was higher. We therefore believe that unreacted silica within the DSF agglomerates adsorbs Cs ions and consequently increases their immobilization. Furthermore, this work suggests that during the pozzolanic reaction, a hydrated rim develops around the agglomerate that acts as an additional diffusion barrier for the Cs ions, resulting in an increased efficiency of Cs immobilization.
The mechanism of cesium immobilization in densified silica-fume blended cement pastes
Bar-Nes, G. (author) / Katz, A. (author) / Peled, Y. (author) / Zeiri, Y. (author)
Cement and Concrete Research ; 38 ; 667-674
2007-09-10
8 pages
Article (Journal)
Electronic Resource
English
The mechanism of cesium immobilization in densified silica-fume blended cement pastes
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