Scrutinizing Gypsum Board Thermal Performance at Dehydration Temperatures

Kontogeorgos, D; Mandilaras, I; Founti, M

dc.contributor.author	Kontogeorgos, D	en
dc.contributor.author	Mandilaras, I	en
dc.contributor.author	Founti, M	en
dc.date.accessioned	2014-03-01T02:05:27Z
dc.date.available	2014-03-01T02:05:27Z
dc.date.issued	2011	en
dc.identifier.issn	0734-9041	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/29488
dc.subject	gypsum	en
dc.subject	dehydration energy	en
dc.subject	calcination	en
dc.subject	thermal properties	en
dc.subject	conductivity	en
dc.subject.classification	Engineering, Multidisciplinary	en
dc.subject.classification	Materials Science, Multidisciplinary	en
dc.subject.other	CALCIUM-CARBONATE	en
dc.subject.other	DECOMPOSITION	en
dc.subject.other	FIRE	en
dc.subject.other	CONDUCTIVITY	en
dc.subject.other	ASSEMBLIES	en
dc.subject.other	KINETICS	en
dc.title	Scrutinizing Gypsum Board Thermal Performance at Dehydration Temperatures	en
heal.type	journalArticle	en
heal.language	English	en
heal.publicationDate	2011	en
heal.abstract	This article investigates the thermal performance of gypsum boards in the dehydration temperature region, where pronounced chemical reactivity is anticipated. Gypsum board samples were gradually heated up to 300 degrees C, using a low heating rate. Temperature measurements at pre-selected board locations indicated three distinct stages of gypsum dehydration; free moisture evaporation, transformation of calcium sulfate dihydrate to calcium sulfate hemi-hydrate and of calcium sulfate hemi-hydrate to calcium sulfate anhydrate. Physical properties of the gypsum board sample, that is density, specific heat, and thermal conductivity, were measured as a function of the dehydration temperature range. Results suggested that the thermal conductivity of the calcium anhydrate sulfate is higher than that of the hemi-hydrate, despite the fact that gypsum porosity increases during the dehydration process. Based on the experimental results, correlations for the thermal conductivity and the dehydration energy as a function of the mass loss during the dehydration process and the initial water content of the gypsum board, respectively, were obtained.	en
heal.publisher	SAGE PUBLICATIONS LTD	en
heal.journalName	JOURNAL OF FIRE SCIENCES	en
dc.identifier.isi	ISI:000287845600002	en
dc.identifier.volume	29	en
dc.identifier.issue	2	en
dc.identifier.spage	111	en
dc.identifier.epage	130	en