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The influence of Group I metal chlorides on water loss and chloride release from magnesium oxychloride cements

The influence of Group I metal chlorides on water loss and chloride release from magnesium oxychloride cements

Canneson, Elodie, Manier, Suliane and Nicholson, John W. (2011) The influence of Group I metal chlorides on water loss and chloride release from magnesium oxychloride cements. Ceramics-Silikaty, 55 (2). pp. 183-187. ISSN 0862-5468 (Print), 1804-5847 (Online)

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Abstract

The water loss and chloride release from four different formulations of magnesium oxychloride cement have been studied. The formulations were all based on 25% m/m aqueous MgCl2 and the solutions employed to prepare cements consisted of either MgCl2:water or MgCl2:aqueous MCl (M = Li, Na or K, all MCl salts at 1 mol dm-3). Solutions were mixed with solid MgO at a ratio of 1:1 (m/v) and allowed to harden at room temperature for 1 hour. Five disc-shaped specimens (6 mm diameter × 2 mm thickness) of each were prepared, stored in a desiccating atmosphere and weighed at regular intervals. All were found to lose water rapidly, equilibrating within three hours. Water loss was Fickian to values of Mt/M∞ of around 0.7 in all cases. Diffusion coefficients were slightly smaller than for the additive-free cement (1.52 × 10-6 cm2/s) and fell in the range 1.27-1.39 × 10-6 cm2/s. Equilibrium water losses varied from 23.1% (with NaCl) to 20.0% (with KCl), but only with NaCl did the value differ significantly from that for the additive-free cement (20.7%). Chloride release was increased by the presence of the additives. It followed a consistent pattern, with a maximum generally at about 5 hours, followed by a reduction up to 2 weeks (336 hours). This shows that a proportion of the released chloride was taken back up as the cement matured.

Item Type: Article
Uncontrolled Keywords: magnesium oxychloride, alkali metals, water diffusion, chloride release
Subjects: Q Science > QD Chemistry
Faculty / Department / Research Group: Faculty of Engineering & Science
Faculty of Engineering & Science > Department of Pharmaceutical, Chemical & Environmental Sciences
Related URLs:
Last Modified: 17 Oct 2016 09:11
Selected for GREAT 2016: None
Selected for GREAT 2017: None
Selected for GREAT 2018: None
URI: http://gala.gre.ac.uk/id/eprint/7205

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