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Title: | Incorporating Cs and Sr into blast furnace slag inorganic polymers and their effect on matrix properties | Authors: | VANDEVENNE, Niels Ion Iacobescu, Remus Pontikes, Yiannis CARLEER, Robert THIJSSEN, Elsy GIJBELS, Katrijn SCHREURS, Sonja SCHROEYERS, Wouter |
Issue Date: | 2018 | Source: | JOURNAL OF NUCLEAR MATERIALS, 503, p. 1-12 | Abstract: | Minimizing harmful effects to the environment in waste-management practices requires continuous innovation. This is especially important in the field of radioactive waste management. Alternatives to the commonly used ordinary Portland cement matrices are being increasingly studied for improved immobilisation purposes. The development of inorganic polymers (IP) from industrial residues has been successfully studied for the immobilisation of caesium (Csþ) and strontium (Sr2þ). However, knowledge of the effect of these introduced elements on the IP-matrix is scarce, especially considering that studied effects are dependent on the IP-precursor characteristics and the form in which the Csþ and Sr2þ are introduced. In this study, IPs containing varying amounts of CsNO3 and Sr(NO3)2 were developed to study the effect of the introduced elements on the IP-characteristics. IP-samples were developed from ground granulated blast furnace slag (GGBFS) and 6 M NaOH activating solution. Csþ and Sr2þ were added to account for 0.5, 1 and 2 wt% of the total IP-mass. Throughout the entire study, Csþ-addition showed no significant effects on the studied parameters. Calorimetric results showed that Sr2þ severely affects reaction kinetics, consuming hydroxide ions necessary for the alkali activation reaction. Sr2þ-addition also caused a severe decrease in compressive strength, increased calcium leaching, and decreased sodium and hydroxide leaching. Micro-chemical analyses showed that Csþ is almost fully incorporated in the formed IP-matrix, while Sr2þ mainly precipitates as Sr(OH)2 in concentrated regions throughout the IP-structure. The findings presented in this paper give insights on the effect of contaminant elements on the immobilising matrix. | Notes: | Schroeyers, W (reprint author), Hasselt Univ, CMK, Nucl Technol Ctr NuTeC, Fac Engn Technol, Gebouw H, B-3590 Diepenbeek, Belgium, wouter.schroeyers@uhasselt.be | Keywords: | inorganic polymer; waste immobilisation; slag; caesium; strontium; alkali activation | Document URI: | http://hdl.handle.net/1942/25994 | ISSN: | 0022-3115 | e-ISSN: | 1873-4820 | DOI: | 10.1016/j.jnucmat.2018.02.023 | ISI #: | 000429498200001 | Rights: | Copyright 2018 Elsevier B.V. All rights reserved | Category: | A1 | Type: | Journal Contribution | Validations: | ecoom 2019 |
Appears in Collections: | Research publications |
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File | Description | Size | Format | |
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REVISED_manuscript_NielsVandevenne_Final.pdf | Peer-reviewed author version | 2.66 MB | Adobe PDF | View/Open |
1-s2.0-S0950061818302770-main.pdf Restricted Access | Published version | 854.62 kB | Adobe PDF | View/Open Request a copy |
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