G. Bar-Nes, A. Katz
The immobilization mechanism of cesium (Cs) ions in cementitious pastes utilizing densified silica-fume (DSF) was investigated in this study. The objective was to understand the role of silica-fume agglomerates in reducing the leachability of Cs ions. Two forms of silica fume—DSF and raw silica fume (RSF)—were incorporated into the cement pastes, and leaching experiments were conducted to assess their effectiveness. Results indicated that both DSF and RSF reduced Cs leachability, with DSF exhibiting a significantly stronger effect. Analytical techniques such as Scanning Electron Microscopy and Differential Thermal Analysis revealed that RSF pastes lacked agglomerated particles, and had higher pozzolanic reactivity. The unreacted silica within the DSF agglomerates was identified as a key component that adsorbs Cs ions, thereby enhancing their immobilization. Furthermore, the findings suggested that during the pozzolanic reaction, a hydrated rim forms around the agglomerates, which serves as an additional diffusion barrier for Cs ions, leading to an improved efficiency in Cs immobilization. This study provides valuable insights into optimizing cesium management in cementitious materials.
@article{433d9d78-a12a-4da2-bcb8-df634e2eed36,
title={The mechanism of cesium immobilization in densified silica-fume blended cement pastes},
author={G. Bar-Nes and A. Katz},
year={2008},
language={en}
}TY - JOUR TI - The mechanism of cesium immobilization in densified silica-fume blended cement pastes AU - G. Bar-Nes AU - A. Katz PY - 2008 LA - en ER -
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