Collier, N.C., Milestone, N.B., Travis, K.P. orcid.org/0000-0001-8557-2689 et al. (1 more author) (2016) The effect of organic retarders on grout thickening and setting during deep borehole disposal of high-level radioactive waste. Progress in Nuclear Energy, 90. pp. 19-26. ISSN 0149-1970
Abstract
Deep borehole disposal (DBD) is being increasingly seen as a viable and potentially superior alternative to comparatively shallow mined repository concepts for disposal of some high-level radioactive wastes. We report here details of proof-of-concept investigations into the use of cementitious grouts as sealing/ support matrices for use in low temperature DBD scenarios. Using the cementitious grout to fill annular space within the disposal zone will not only support waste packages during placement, but will also provide a low permeability layer around them which will ultimately enhance the safety case for DBD. Grouts based on Class G oil well cement are being developed. The use of retarders to delay the accelerated onset of thickening and setting (caused by the high temperature and pressure in the borehole) is being investigated experimentally. Sodium gluconate and a polycarboxylate additive each provide suf- ficient retardation over the range 90e140 °C in order to be considered for this application. Phosphonate and sulphonate additives provide desirable retardation at 90 °C. The additives did not affect grout composition at 14 days curing and the phases formed are durable at elevated temperature and pressure.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2016 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). |
Keywords: | Radioactive waste; Deep borehole disposal; Cement; Retarder; Organic |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Materials Science and Engineering (Sheffield) |
Funding Information: | Funder Grant number ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL (EPSRC) EP/K039350/1 |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 14 Apr 2016 12:51 |
Last Modified: | 14 Apr 2016 12:52 |
Published Version: | http://dx.doi.org/10.1016/j.pnucene.2016.02.021 |
Status: | Published |
Publisher: | Elsevier |
Refereed: | Yes |
Identification Number: | 10.1016/j.pnucene.2016.02.021 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:98389 |
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