Thermal Performance of Magnesium Oxide Wall Board Using Numerical Modelling

Rusthi, Mohamed; Poologanathan, Keerthan; Mahendran, Mahen; Ariyanayagam, Anthony

doi:10.1007/978-981-10-0376-9_68

Cited by 2 publications

(3 citation statements)

References 5 publications

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“…Gypsum plasterboard contains 21% of chemically bound water and 4% of free water. 23 [Equation ( 6)]. 25 Heat absorption during dehydration processes reduces the heat transfer through the boards, which improves the fire resistance of wall systems.…”

Section: Standard Gypsum Plasterboardmentioning

confidence: 99%

Elevated temperature thermal properties of advanced materials used in LSF systems

2021

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Lightweight cold-formed steel (CFS) construction solutions are increasingly adopted in low and mid-rise buildings. Many different materials are used to construct CFS wall systems, without a full understanding of their thermal properties. For many of these materials, only ambient temperature thermal properties are available from their manufacturers. This creates difficulty in classifying the materials for use at elevated temperatures. In this study, a series of elevated temperature thermal property tests to measure specific heat, thermal conductivity, and mass loss was conducted for a range building materials from wallboards, insulation, and phase-change materials (PCMs), used in Australia and several other countries. Simultaneous Thermal Analyser and Laser Flash Apparatus were used to determine the elevated temperature thermal properties of the selected materials, gypsum plasterboard, PCM incorporated gypsum plasterboard, magnesium sulphate board, fibre cement board, cellulose insulation, vacuum insulation panel, microencapsulated paraffin PCM, and bio-based PCM. Their elevated temperature thermal properties are presented in this article, which also includes analyses of their chemical composition and associated chemical reactions at elevated temperatures. These results can be used in the selection of suitable energyefficient and fire-resistive materials, and in heat transfer modeling to identify wall configurations with increased fire resistance and energy efficiency.

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Section: Standard Gypsum Plasterboardmentioning

confidence: 99%

Elevated temperature thermal properties of advanced materials used in LSF systems

2021

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“…Plots shown in solid black lines illustrate other cases where thermal properties fluctuate within reasonable limits, based on possible margins of error in the measuring instruments. The authors referenced in Figure 2.7 to Figure 2.9report the following uncertainties in their results: 2% for Specific Heat, 2% for Relative Density and from -15% to 5% for Thermal conductivity[60].…”

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“…In addition, Jays et al[59] confirmed Rusthi's observations by performing a Thermo-gravimetric analysis (TGA) while assessing the suitability of MGO boards for use in high humidity environments. Samples used in all three studies were obtained from the Australian market and tested in different locations in Queensland, therefore their observations and results are well applicable to the current case.Using Differential Scanning Calorimetry (DSC), Rusthi et al[60] provided data for the Specific Heat of the same samples of MGO Board, as well as relative density obtained by means of TGA. In addition, they also presented reference values of thermal conductivity, which were measured with a custom-made testing equipment.…”

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Fire and structural performance of structural insulated panels

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This thesis characterizes the behaviour of Structural Insulated Panels (SIPs) under fire conditions. The composite construction material addressed here has a sandwich configuration; the core is made from Expanded Polystyrene (EPS) and the face sheets are Magnesium Oxide (MGO) boards. It is a modular lightweight system, prefabricated to meet requirements of the end-user. While the quantitative results shown herein are relevant to the specific product studied, the general analysis and observations are applicable to any multi-layer composite panel. There is vast information that explains the structural behaviour of SIPs at ambient conditions. However, the number of studies on fire performance is less extensive. Previous research has focused on performing standard tests aimed at determining the fire resistance (to fulfil regulatory requirements) for specific products or on measuring flammability parameters to assess the impact they may have upon compartment fire dynamics. Moreover, common design for fire safety is done only from a prescriptive point of view, where the fire resistance rating is the only basis for design. This perspective is ill conceived, since it relies fully on the capacity of the face sheets (e.g. MGO) to provide encapsulation to a combustible core (e.g. EPS). Encapsulation is a strong function of combined thermal and mechanical behaviour; hence, the combined action of temperature and load needs attention. Nevertheless, this combined action of mechanical loading and increasing temperature rarely has been investigated, and therefore the performance of SIPs during or after fire is not fully understood. Fire performance and structural behaviour are two mutually affecting processes. Thermal degradation of load bearing materials causes a reduction in the capacity of the system to carry loads and provide a sound structural performance. In a similar manner, a compromised mechanical integrity diminishes its fire performance because the capacity to encapsulate the combustible core is reduced. To explain such complex interaction, this research study uses a combination of structural mechanics principles, heat transfer modelling and experiments to develop a composite analysis that describes the thermomechanical behaviour of the panels. SIP's failure mechanisms at ambient temperature were determined by conducting experiments on full-scale samples as well as modified specimens. These were compared with the observations of similar tests conducted on samples tested under residual conditions (i.e. heated and cooled down prior to testing). By performing independent experimentation on each comprising material (EPS, MGO) viii Financial support This research was partially funded by the linkage project LP13 "The design and construction of quality, sustainable and affordable pre-made housing in Australia-Optimisation and Interaction",

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Thermal Performance of Magnesium Oxide Wall Board Using Numerical Modelling

Cited by 2 publications

References 5 publications

Elevated temperature thermal properties of advanced materials used in LSF systems

Elevated temperature thermal properties of advanced materials used in LSF systems

Fire and structural performance of structural insulated panels

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