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Special Section Papers

Cesium and Strontium Immobilization in Portland Cement Pastes Blended With Pozzolanic Additives

[+] Author and Article Information
Gabriela Bar-Nes

Chemistry Department,
NRCN,
P.O. Box 9001,
Beer-Sheva 84190, Israel
e-mail: gabi.barnes@gmail.com

Yael Peled

Chemistry Department,
NRCN,
P.O. Box 9001,
Beer-Sheva 84190, Israel
e-mail: yael.pe69@gmail.com

Zorik Shamish

Chemistry Department,
NRCN,
P.O. Box 9001,
Beer-Sheva 84190, Israel
e-mail: zoriksh@gmail.com

Amnon Katz

Faculty of Civil and Environmental Engineering,
Technion,
Haifa 320003, Israel
e-mail: akatz@technion.ac.il

1Corresponding author.

Manuscript received June 22, 2016; final manuscript received December 2, 2016; published online May 25, 2017. Assoc. Editor: Ilan Yaar.

ASME J of Nuclear Rad Sci 3(3), 030907 (May 25, 2017) (5 pages) Paper No: NERS-16-1061; doi: 10.1115/1.4035415 History: Received June 22, 2016; Revised December 02, 2016

The effect of incorporation of pozzolanic additives on the immobilization of cesium and strontium ions in cementitious pastes was investigated. Pastes containing Portland cement together with ground granulated blast furnace slag (GGBFS) (50%, 75%), metakaolin (MK) (10%, 20%), or silica fume (SF) (20%), either in its densified or raw form, were prepared. The transport properties of the immobilized ions through the paste were evaluated using leaching tests. Single differential thermal analysis (SDTA) was used to estimate the extent of the pozzolanic reaction and the pozzolanic reactivity of the different formulations. For strontium ions, the best immobilization system was the 20% raw silica fume (RSF) paste, characterized by the highest relative pozzolanity (RP). However, for cesium ions the most effective additive was the densified silica fume (DSF), reducing the apparent diffusion coefficient by two orders of magnitude compared to the unblended paste.

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Figures

Grahic Jump Location
Fig. 1

Cumulative fraction of Sr as a function of time in the leaching experiment

Grahic Jump Location
Fig. 2

Cumulative fraction of Cs as a function of time in the leaching experiment

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