Properties of magnesium oxide boards used as sheathing in exterior walls

Nielsen, Susanne Balslev; Rode, Carsten; Bunch-Nielsen, Tommy; Hansen, Kathleen A.; Kunther, Wolfgang; Grelk, Bent

doi:10.1051/matecconf/201928202091

Cited by 4 publications

(5 citation statements)

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“…A study by Rode et al [29] also confirms that when relative humidity exceeds 84%, MgO boards start to absorb excessive amounts of moisture from the surrounding air. As such higher levels of humidity are typical in the places where exterior lining is to be used, it can be concluded that MgO boards are not a suitable product for this purpose.…”

Section: Moisture Propertiesmentioning

confidence: 82%

MgO-Based Board Materials for Dry Construction Are a Tool for More Sustainable Constructions—Literature Study and Thermal Analysis of Different Wall Compositions

2021

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Growing global environmental problems force us to think about their impact and search for ways to protect the environment. While the construction industry and the production of construction materials contribute to environmental pollution, they also offer great potential for addressing many environmental problems. Important opportunities exist in the use and processing of a whole host of industrial and construction waste and in the use of mineral resources. Among such mineral resources is magnesite, whose deposits in Slovakia are abundant. The current sustainability trends impose strict requirements on construction materials and products, favoring solutions with sufficient ecological and efficiency performance characteristics. With this focus on efficient and sustainable solutions in mind, the objective of this research was to analyze magnesium oxide construction boards, as they are the most commonly used construction product based on MgO. The specific MgO-based boards that were studied were applied in selected constructions built using the so-called dry method of construction and were compared with traditional material solutions. The research methodology is based on an analysis of computational models of the proposed variants to determine selected thermal-technical parameters. The analyses of external and interior structures presented in this work suggest that when boards based on MgO and traditional materials are used for coating constructions built using the dry method of construction, the former provide certain benefits in terms of energy accumulation, improving living comfort, and in terms of the fire resistance of constructions, improving overall safety. The conclusion of the presented article is devoted to discussions with works that addressed various perspectives on the application of MgO in the field of materials research. The findings from this analysis are beneficial especially in terms of expanding the knowledge in the area.

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Section: Moisture Propertiesmentioning

confidence: 82%

MgO-Based Board Materials for Dry Construction Are a Tool for More Sustainable Constructions—Literature Study and Thermal Analysis of Different Wall Compositions

2021

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“…Exposure to high RH removes influence from the changing pH of the water solution which is dependent on the mix composition. Furthermore, it is more representative of conditions in applications where MOC is currently used such as a sheathing board in wall systems (Aiken et al 2020;Wøhler Nielsen et al 2019) where they can be exposed to periods of high RH rather than immersed in water. Fig.…”

Section: Moisture Resistancementioning

confidence: 99%

“…It is also susceptible to moisture which causes transformation of its main phases and a subsequent loss of strength (Deng 2003;Mitina et al 2016;Wang et al 2019). Despite these issues MOC has many niche applications including grinding wheels, lightweight wall panels, floor tiles and decorative panels (Aiken et al 2020(Aiken et al , 2021Chau and Li 2008;Li and Chau 2008;Wøhler Nielsen et al 2019;Zhou and Li 2012).…”

Section: Introductionmentioning

confidence: 99%

Effect of Molar Ratios and Curing Conditions on the Moisture Resistance of Magnesium Oxychloride Cement

Aiken

Russell

McPolin

et al. 2022

J. Mater. Civ. Eng.

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Magnesium oxychloride cement (MOC) is a promising binder with many advantageous properties over traditional binders. Its main downfall, restricting large scale use, is its inherent susceptibility to moisture. However, in recent years, niche applications have developed where MOC has been deployed successfully. These include lightweight wall panels, floor tiles and decorative panels. This paper investigates the effect of molar ratios (MgO/MgCl2 and H2O/MgCl2) and curing conditions on MOC. Findings illustrate that the use of appropriate molar ratios and the implementation of a suitable 2 curing regime can significantly improve the moisture resistance of MOC. After 28 days immersion in water the MOC lost between 40-90% of their strength depending on the molar ratio, demonstrating the importance of correct proportioning. It was also found that curing MOC at temperatures between 20 and 50°C provides the most stable MOC in humid conditions. These findings add to the current knowledge available on MOC. They will help end users to improve the performance of MOC in its current applications and work towards broadening the range of applications where MOC can be used successfully.

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“…Unfortunately, complete flat roofs were difficult to execute with sufficient quality and the roofing materials were not durable for this solution. Therefore, many roofs leaked and resulted in expensive renovation projects and claims corresponding to 4 % of the contract sum for dwellings with flat roofs (Bunch- Nielsen, 2019).…”

Section: Case 1: Flat Roofsmentioning

confidence: 99%

“…The binder in MgO board is formed by a chemical reaction between MgO and MgCl2. Boards containing MgSO4 were later introduced to the market because of the less hygroscopic behavior of MgSO4 compared to MgCl2 but they showed not to be a feasible alternative in Denmark and countries with a similar humid climate (Wøhler Nielsen et al, 2019).…”

Section: Case 2: Magnesium Oxide Containing Boards As Wind Barriermentioning

confidence: 99%

How to Determine when a New Building Product is Suitable - Certifications and Experience

Hansen¹,

Nielsen²,

Møller³

et al. 2020

XV International Conference on Durability of Building Materials and Components. eBook of Proceedings

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Previously, only solutions with long-term experience were used in the building sector and it was sufficient to describe, e.g. in the building regulations, how they should be constructed. However, the innovation rate has gradually increased, encouraged by industrialization and by building regulations becoming more functional based. As a result, the required performance is often described for the whole building or for a building component, but not at product level. Furthermore, CE marking makes it possible to market and sell a product in any country within the European Union if only one or a few properties are declared, and these may even not be the most relevant ones for a specific application in a technical solution. A CE mark is therefore neither a quality mark nor an approval of the product for a specific application, although clients and consultants often believe this is the case. It is therefore a major challenge for the building sector to determine if a new building product is suitable in a specific technical solution (wall, roof, etc.). The paper identifies a gap between performance-based requirements for a technical solution and specific requirements to properties of building products. Two cases (flat roofs with no slope, MgO-containing boards used as wind barriers) show the possible economic consequences of not closing this gap; the technical solution failed, as one of the products was not suitable for Danish weather conditions. The first case initiated the formation of the Danish Building Defects Fund in 1986, the second one from 2015 shows that the gap still exits, 30 years later. The cases show how difficult it can be even for professionals to understand different certifications, especially when a product seems to be well suited for a specific use. Based on the cases, the paper presents a systematic approach that guides users through important issues relating to requirements for a moisture-safe building envelope.

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Properties of magnesium oxide boards used as sheathing in exterior walls

Cited by 4 publications

References 1 publication

MgO-Based Board Materials for Dry Construction Are a Tool for More Sustainable Constructions—Literature Study and Thermal Analysis of Different Wall Compositions

MgO-Based Board Materials for Dry Construction Are a Tool for More Sustainable Constructions—Literature Study and Thermal Analysis of Different Wall Compositions

Effect of Molar Ratios and Curing Conditions on the Moisture Resistance of Magnesium Oxychloride Cement

How to Determine when a New Building Product is Suitable - Certifications and Experience

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