Gypsum: an investigation of microstructure and mechanical properties

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Abstract

This article addresses the microstructure and mechanical properties of a ß-hemihydrate produced gypsum from a combined study of hydration and dehydration. A thin layer of adsorbed water molecules around the particles is necessary to assure the fluidity of the hydrating system and the thickness of this water layer is derived using the spread-flow test. The shape factor of the investigated hemihydrate is derived from the spread-flow test. The mechanical property of the generated gypsum is investigated and the influence of water content is discussed. The dehydration of gypsum is studied by both thermo gravimetric analysis and heating the samples in a ventilated oven. A model is proposed to describe the microstructure change beyond dehydration and experimental results show its validity. The mechanical property of the gypsum beyond dehydration is presented as well.
Original languageEnglish
Title of host publicationProceedings 8th fib International PhD Symposium in Civil Engineering, Lyngby (Denmark), June 2010
EditorsG Fischer, M Geiker, O Hededa, L Ottoson, H Stang
Place of PublicationDenmark
PublisherTechnical University of Denmark
Pages341-346
ISBN (Print)9788778773012
Publication statusPublished - 2010
Event8th fib International PhD Symposium in Civil Engineering - Copenhagen, Denmark
Duration: 20 Jun 201023 Jun 2010

Conference

Conference8th fib International PhD Symposium in Civil Engineering
Country/TerritoryDenmark
CityCopenhagen
Period20/06/1023/06/10
Other8th fib International PhD Symposium in Civil Engineering

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