Mobasher, N., Bernal, S.A., Kinoshita, H. et al. (1 more author) (2016) Gamma irradiation resistance of early age Ba(OH)2-Na2SO4-slag cementitious grouts. Journal of Nuclear Materials, 482. pp. 266-277. ISSN 0022-3115
Abstract
The gamma irradiation resistance of early age Ba(OH)2-Na2SO4-slag cementitious grouts, formulated for the immobilisation of sulfate bearing nuclear waste, was assessed. The observable crystalline phases were not modified upon heating (50 °C) or upon gamma irradiation up to a total dose of 2.9 MGy over 256 h, but the compressive strengths of the irradiated samples increased significantly. 27Al and 29Si MAS NMR spectroscopy showed that the main binding phase, a calcium aluminosilicate hydrate (C-A-S-H) type gel, had a more ordered and polymerised structure upon heating and irradiation compared to that identified in reference samples. This is associated with a higher degree of reaction of the slag. Samples formulated with the waste simulant Na2SO4, but without Ba(OH)2, became porous and cracked upon heating and irradiation, but still retained their compressive strength. The Ba(OH)2-Na2SO4-slag grouts evaluated in this work withstand gamma irradiation without showing identifiable damage, and are thus a technically feasible solution for immobilisation of sulfate-bearing nuclear wastes.
Metadata
Item Type: | Article |
---|---|
Authors/Creators: |
|
Copyright, Publisher and Additional Information: | © 2016 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). |
Keywords: | Gamma radiation; Nuclear waste; Barium sulfate; Alkali-activated cements; X-ray diffraction; Nuclear magnetic resonance spectroscopy |
Dates: |
|
Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Materials Science and Engineering (Sheffield) |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 15 Nov 2016 12:07 |
Last Modified: | 15 Nov 2016 12:07 |
Published Version: | http://dx.doi.org/10.1016/j.jnucmat.2016.10.032 |
Status: | Published |
Publisher: | Elsevier |
Refereed: | Yes |
Identification Number: | 10.1016/j.jnucmat.2016.10.032 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:107332 |