Moisture damage with magnesium oxide boards in Danish facade structures

Rode, Carsten; Bunch-Nielsen, Tommy; Hansen, Kathleen A.; Grelk, Bent

doi:10.1016/j.egypro.2017.10.025

Cited by 16 publications

(14 citation statements)

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“…The starting materials were commercially available Al 2 O 3 powder (Sigma-Aldrich, 99.99%) and MgO powder (Sigma-Aldrich, > 99%). MgO powder was dried in a furnace at 1200°C for 6 h to remove the possible moisture absorption from outside air [10]. There is only one eutectic composition between Al 2 O 3 and MgO, which appears at 55 wt% Al 2 O 3 and 45 wt% MgO and its melting temperature is around 1999°C [11].…”

Section: Methodsmentioning

confidence: 99%

Non-Hall-Petch hardness dependence in ultrafine fibrous MgAl2O4-MgO eutectic ceramics fabricated by the laser-heated floating zone (LFZ) method

Moshtaghioun

Peña

2019

Journal of the European Ceramic Society

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Section: Methodsmentioning

confidence: 99%

Non-Hall-Petch hardness dependence in ultrafine fibrous MgAl2O4-MgO eutectic ceramics fabricated by the laser-heated floating zone (LFZ) method

Moshtaghioun

Peña

2019

Journal of the European Ceramic Society

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“…This mechanism would account for the issues reported in Denmark [34,35]. As well as the moisture from the environment the decomposition of 5-phase gives rise to the release of moisture previously contained within the 5-phase mineral structure.…”

Section: Accelerated Ageingmentioning

confidence: 97%

“…Whilst magnesium oxychloride boards offer many virtues, recent reports [34][35][36] have highlighted durability issues with magnesium oxychloride wallboards used in Denmark. Specifically, during periods of high relative humidity (RH) water droplets formed on the surface of the boards.…”

Section: Introductionmentioning

confidence: 99%

Magnesium oxychloride boards: understanding a novel building material

et al. 2020

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Magnesium oxide type building boards are a relatively new alternative to traditional sheeting materials such as plywood, gypsum plasterboard and fibre-cement board. They have many advantages; strength, lightweight, ease of use and excellent fire resistance, which has become increasingly important as demanded by industry and required by more stringent legislation. Recently cases of durability issues associated with magnesium oxychloride boards in Denmark have emerged, however the precise nature of the problem was not established. These issues have been related to magnesium oxychloride boards which were exposed to high levels of moisture. In this paper the mechanism of the failures observed in Denmark has been investigated. The difference in quality between various magnesium oxychloride boards available in the market was also studied. It was found that there are significant differences, both physically and chemically, between magnesium oxychloride boards supplied from different manufacturers. Crucially, the performance of each board when exposed to high levels of relative humidity was vastly different. Some of the boards investigated displayed behaviour similar to that observed in Denmark, whilst other boards exhibited substantial resistance to humid environments and had not deteriorated after 60 weeks of exposure.

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“…The starting materials were commercially available Al 2 O 3 powder (Sigma-Aldrich, 99.99%) and MgO powder (Sigma-Aldrich,>99%). MgO powder was dried in a furnaceat 1200 ºC for 12 h to remove the possible moisture absorption from outside air [33].The eutectic point of MgO and MgAl 2 O 4 appears at 55wt% Al 2 O 3 and 45 wt% MgO and its melting temperature is around 2000 ºC [34]. Two general approaches using lasermelting techniques were studied for the possible fabrication of this eutectic ceramic with dense and fine microstructure retention.…”

Section: Methodsmentioning

confidence: 99%

Medium infrared transparency of MgO-MgAl2O4 directionally solidified eutectics

Moshtaghioun

Peña

Merino

2020

Journal of the European Ceramic Society

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MgAl 2 O 4 -MgO eutectic ceramics have been fabricated by the laser floating zone method.Increasing growth rates from 10 to 50 mm/h, the microstructure transformed from irregular MgO rod-to-lamellae phase and it approached to almost homogeneous rod morphology. At the highest used velocity of 750 mm/h, the cell structure was completely dominant and the samples were free from transversal cracks. Although the highest flexure strength was found at 750 mm/h growth rate, the maximum optical transmittance in the medium-infrared range was obtained for 50 mm/h growth rate and for 1mm thick samples reached values higher than 75% in the wavelengths between 4 and 5.3µm.The enhanced transmittance for the sample with 50 mm/h growth rate can be explained in terms of the close refraction indexes of the component phases and the characteristic lengths of the resulting microstructure showing fully dense ceramics with the finest and almost homogeneous microstructure.

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Moisture damage with magnesium oxide boards in Danish facade structures

Cited by 16 publications

References 0 publications

Non-Hall-Petch hardness dependence in ultrafine fibrous MgAl2O4-MgO eutectic ceramics fabricated by the laser-heated floating zone (LFZ) method

Non-Hall-Petch hardness dependence in ultrafine fibrous MgAl2O4-MgO eutectic ceramics fabricated by the laser-heated floating zone (LFZ) method

Magnesium oxychloride boards: understanding a novel building material

Medium infrared transparency of MgO-MgAl2O4 directionally solidified eutectics

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