Gypsum: an investigation of microstructure and mechanical properties

Qingliang Yu, H.J.H. Brouwers

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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 of the 8th fib International PhD Symposium in Civil Engineering, 20-23 June 2010, kgs. Lyngby, Denmark
    EditorsGregor Fisher, Mette Geiker, Ole Hededal, Lisbeth M. Ottosen, Henrik Stang
    Place of PublicationKgs. Lyngby, Denmark
    PublisherDTU Byg, Technical University of Denmark
    Pages341-346
    ISBN (Print)9788778773012
    Publication statusPublished - 20 Jun 2010
    Event8th FIB International PhD Symposium in Civil Engineering 2010 - Technical University of Denmark, Kgs. Lyngby, Denmark
    Duration: 20 Jun 201023 Jun 2010

    Conference

    Conference8th FIB International PhD Symposium in Civil Engineering 2010
    CountryDenmark
    CityKgs. Lyngby
    Period20/06/1023/06/10

    Keywords

    • METIS-268392

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