Mobasher, N, Bernal, SA, 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 terms of the Creative Commons Attribution License (CC-BY 4.0), which permits unrestricted use, distribution and reproduction in any medium, provided the original work is properly cited. To view a copy of this license, visit 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 Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Civil Engineering (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 12 Sep 2018 10:17 |
Last Modified: | 12 Sep 2018 10:17 |
Status: | Published |
Publisher: | Elsevier |
Identification Number: | 10.1016/j.jnucmat.2016.10.032 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:135522 |