Garcia-Lodeiro, I., irisawa, K., Jin, F. et al. (2 more authors) (2018) Reduction of water content in calcium aluminate cement with/out phosphate modification for alternative cementation technique. Cement and Concrete Research, 109. pp. 243-253. ISSN 0008-8846
Abstract
Cementation of the secondary aqueous wastes from TEPCO Fukushima Daiichi Nuclear Power Plant is challenging due to the significant strontium content and radioactivity, leading to a potential risk of hydrogen gas generation via radiolysis of water content. The present study investigates the reduction of water content in calcium aluminate cement (CAC) with/out phosphate modification by a heat-treatment during the solidification. The reduction of water in the CAC was found restricted by the rapid formation of crystalline hydration phases, whereas the phosphate-modified system allowed the gradual reduction of water, achieving the reduction of 60% water content at 95 °C. Curing at 60–95 °C also eliminated the significant cracks found at 35 °C in the phosphate system. The possible difference in the amorphous products, NaCaPO4∙nH2O type at 35 °C and Ca(HPO4)∙xH2O type at 60–95 °C, may have contributed to the improvement in the microstructure together with the change in the pore size distribution.
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Copyright, Publisher and Additional Information: | © 2018 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: | Calcium aluminate cement (CAC); Phosphate cement; Water reduction; Hydroxyapatite; Fukushima Daiichi nuclear power plant | ||||
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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) | ||||
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Depositing User: | Symplectic Sheffield | ||||
Date Deposited: | 30 May 2018 15:41 | ||||
Last Modified: | 24 Oct 2018 10:45 | ||||
Published Version: | https://doi.org/10.1016/j.cemconres.2018.04.019 | ||||
Status: | Published | ||||
Publisher: | Elsevier | ||||
Refereed: | Yes | ||||
Identification Number: | https://doi.org/10.1016/j.cemconres.2018.04.019 | ||||
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