The modelling of dehydration and stress analysis of gypsum plasterboards exposed to fire

Axenenko, Olga; Thorpe, Graham

doi:10.1016/0927-0256(96)00019-5

Cited by 33 publications

(25 citation statements)

References 2 publications

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“…gypsum board shrinkage and cracking. While many investigators have recognized the importance of modelling the response of both wood-and steel-framed partition assemblies to fire exposure [11,[13][14][15][16][17][18], such models can generally only predict the behaviour of the partition up to the point of insulation failure, as specified under ASTM E119 and ISO 834. The standard insulation criterion is itself of marginal value in assessing fire hazard.…”

Section: Resultsmentioning

confidence: 99%

Influence of gypsum board type (X or C) on real fire performance of partition assemblies

et al. 2006

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SUMMARYThis paper compares the responses of wall-size partition assemblies, composed of either type X or type C gypsum wallboard panels over steel studs, when each was exposed to an intense room fire. The exposures lasted from the time of ignition to beyond flashover. Heat flux gauges provided time histories of the energy incident on the partitions, while thermocouples provided data on the propagation of heat through the partitions and on the progress toward perforation. Visual and infrared cameras were used to image partition behaviour during the fire exposure. Contraction of the seams of the two types of assemblies occurred under similar thermal conditions on the unexposed surface. However, there were noticeable differences in cracking behaviour. Reduced scale experiments were performed in conjunction with the realscale fire tests to provide insight into the contraction and cracking behaviour of the different gypsum board types. Results obtained from these experiments are discussed.

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Section: Resultsmentioning

confidence: 99%

Influence of gypsum board type (X or C) on real fire performance of partition assemblies

et al. 2006

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“…Most research on combined heat and mass transport in gypsum boards focussed on its application regarding fire resistance [1][2][3][4][5][6][7][8][9], thus for high board temperatures (> 100°C) and only accounting for water vapour transport. To the knowledge of the authors, experimental and numerical research on gypsum board drying, i.e.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of convective drying of gypsum boards

Defraeye

Houvenaghel²,

Carmeliet

et al. 2012

International Journal of Heat and Mass Transfer

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Convective drying of gypsum boards is investigated by numerical modelling, within the context of gypsum board manufacturing where enhancing processing efficiency, reducing energy usage and optimising product quality are essential. The aim of this parametric study is to provide a first step towards modelling of the drying process in an industrial drier by investigating the main factors impacting the drying process, such as the influence of air speed, turbulence intensity, approach flow temperature and heterogeneous drying conditions but also the influence of the paper liner on the drying process. Therefore, this study is performed for a simple configuration and at ambient air temperatures. In terms of air flow modelling, CFD simulations are performed in addition to the use of standard convective transfer coefficients. The sensitivity of the drying process to the air flow conditions is found to be limited for a gypsum board with a paper liner due to the high resistance of the paper liner to vapour transport, compared to the boundary layer resistance. Thus, guidelines for modelling drying of gypsum boards under representative manufacturing conditions conclude that detailed flow modelling is less critical to assess this specific drying problem. Instead, characterisation of the material transport properties at high temperatures is more relevant, particularly for the paper liner. KeywordsConvective drying, gypsum board, heat and moisture transfer, manufacturing, convective transfer coefficient, paper liner.

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“…Cette méthode est, par exemple, utilisée en présence de métaux pour simuler des problèmes de soudure de tôles… Cette approche a été utilisée par (Al Nahhas et al, 2004 ;Menou et al, 2004 ;Mounajed, 2001 ;Hager et al, 2004 ;Komonen, 2004) dans le cas de l'étude de bétons et par (Axenenko, 1996) dans le cas de l'étude d'un panneau de gypse. Pour une réaction endothermique φg>0, pour une réaction exothermique φg<0.…”

Section: Les Approches Traditionnellesunclassified

Modélisation du comportement thermique haute température de matériaux minéraux

Baux

Mélinge

Lanos

et al. 2007

Revue Européenne de Génie Civil

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7 christophe.lanos@univ-rennes1.fr RÉSUMÉ. La modélisation du transfert thermique à hautes températures dans des matériaux minéraux hydratés (gypse, ciment…) est analysée. Dans ces conditions, les matériaux étudiés présentent des changements de phases minérales associés à des chaleurs latentes importantes. Le développement d'un four électrique permettant la réalisation de tests d'exposition au feu unidirectionnelle permet de construire une bibliothèque de résultats expérimentaux. En parallèle, un modèle de transfert thermique est construit. Les analyses thermiques de type ATD/TG, permettent d'identifier les paramètres de dégradation thermique des matériaux. Cette cinétique est modélisée par une loi faisant intervenir le degré d'avancement de la réaction de dégradation. Elle pondère directement l'introduction de la chaleur latente dans l'équation de la chaleur. Le code de calcul développé repose sur un schéma implicite et exploite la méthode des différences finies. Différents résultats expérimentaux ou obtenus avec le modèle sont présentés. ABSTRACT. High temperature thermal transfer in hydrated minerals (such as gypsum, cement…) is studied and modelled. Exposed to fire, the studied materials are subject to phases transitions correlated with a high dehydration latent heat. The development of an electric furnace allowing the realisation of unidirectional high thermal transfer. The results of these trials are collected and merge in a database of experimental results. Concurrently, a thermal transfer model is built. Thermal analyses such as DTA/TG are used to determine the degradation kinetics of hydrated minerals. The degradation kinetics is modelled with a classical solid state kinetic law based on the chemical reaction rate. This law is used to balance the dehydration latent heat introduced in the heat equation. The developed model is then based on an implicit scheme and uses the finite difference method. Modelled and experimental results are presented herein. MOTS-CLÉS : protection incendie, transferts thermiques, modélisation, cinétique.

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The modelling of dehydration and stress analysis of gypsum plasterboards exposed to fire

Cited by 33 publications

References 2 publications

Influence of gypsum board type (X or C) on real fire performance of partition assemblies

Influence of gypsum board type (X or C) on real fire performance of partition assemblies

Numerical analysis of convective drying of gypsum boards

Modélisation du comportement thermique haute température de matériaux minéraux

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