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Thermal conductivity of gypsum boards beyond dehydration temperature
Author(s) -
Ghazi Wakili K.,
Koebel M.,
Glaettli T.,
Hofer M.
Publication year - 2014
Publication title -
fire and materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.482
H-Index - 58
eISSN - 1099-1018
pISSN - 0308-0501
DOI - 10.1002/fam.2234
Subject(s) - gypsum , calcination , thermal conductivity , thermal conduction , dehydration , heat transfer , materials science , sintering , convection , thermodynamics , thermal , composite material , chemistry , physics , biochemistry , catalysis
Summary The thermal conductivity of gypsum plasterboard at temperatures beyond its dehydration/calcination temperature is, besides the effective heat capacity, the main parameter defining the increase in heat transfer when the board is submitted on one side to a strongly transient temperature boundary condition. The present study investigates the significant rise in thermal conductivity of dehydrated gypsum plaster board between 200 and 800 °C, reaching the initial hydrated value of 0.3 W/(m·K). It is shown that the main reason for this increase is independent of radiative and convective heat transfers and only due to an enhancement of the conduction between the single crystals induced by an effect similar to sintering. Copyright © 2014 John Wiley & Sons, Ltd.