The influence of Group I metal chlorides on water loss and chloride release from magnesium oxychloride cements
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 MC...
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| Format: | Article |
| Language: | English |
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University of Chemistry and Technology, Prague
2011-06-01
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| Series: | Ceramics-Silikáty |
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| Online Access: | http://www.ceramics-silikaty.cz/2011/pdf/2011_02_183.pdf |
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| author | Elodie Cannesson Suliane Manier John W. Nicholso n |
| author_facet | Elodie Cannesson Suliane Manier John W. Nicholso n |
| author_sort | Elodie Cannesson |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-04-12T18:41:16Z |
| format | Article |
| id | doaj.art-37ec470ddcee430da63bbb23787e92aa |
| institution | Directory Open Access Journal |
| issn | 0862-5468 1804-5847 |
| language | English |
| last_indexed | 2024-04-12T18:41:16Z |
| publishDate | 2011-06-01 |
| publisher | University of Chemistry and Technology, Prague |
| record_format | Article |
| series | Ceramics-Silikáty |
| spelling | doaj.art-37ec470ddcee430da63bbb23787e92aa2022-12-22T03:20:45ZengUniversity of Chemistry and Technology, PragueCeramics-Silikáty0862-54681804-58472011-06-01552183187The influence of Group I metal chlorides on water loss and chloride release from magnesium oxychloride cementsElodie CannessonSuliane ManierJohn W. Nicholso nThe 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.http://www.ceramics-silikaty.cz/2011/pdf/2011_02_183.pdfMagnesium oxychlorideAlkali metalsWater diffusionChloride release |
| spellingShingle | Elodie Cannesson Suliane Manier John W. Nicholso n The influence of Group I metal chlorides on water loss and chloride release from magnesium oxychloride cements Ceramics-Silikáty Magnesium oxychloride Alkali metals Water diffusion Chloride release |
| title | The influence of Group I metal chlorides on water loss and chloride release from magnesium oxychloride cements |
| title_full | The influence of Group I metal chlorides on water loss and chloride release from magnesium oxychloride cements |
| title_fullStr | The influence of Group I metal chlorides on water loss and chloride release from magnesium oxychloride cements |
| title_full_unstemmed | The influence of Group I metal chlorides on water loss and chloride release from magnesium oxychloride cements |
| title_short | The influence of Group I metal chlorides on water loss and chloride release from magnesium oxychloride cements |
| title_sort | influence of group i metal chlorides on water loss and chloride release from magnesium oxychloride cements |
| topic | Magnesium oxychloride Alkali metals Water diffusion Chloride release |
| url | http://www.ceramics-silikaty.cz/2011/pdf/2011_02_183.pdf |
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