Effects of adding Bauxite and Oyster shell on the properties of metakaolin-based geopolymer cements

Kengne, Enselme (2013) Effects of adding Bauxite and Oyster shell on the properties of metakaolin-based geopolymer cements. Masters thesis, University of Yaounde I.

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    Abstract

    This work has investigated the possibility of use bauxite and oyster shell as mineral admixtures,to enhance the properties of metakaolin-based geopolymer cements. Raw materials(metakaolin, bauxite and oyster shell) were characterized in the first time by determination of their chemical and mineralogical compositions, particles size distribution, specific surface area, thermal analysis and then in the second time use to synthesized geopolymers. Different methods of analysis such as Fourier Transform Infrared spectroscopy(FTIR), X-Ray Diffractometry (XRD), and Scanning Electron Microscopy (SEM) were used to assess the variation of setting time, linear shrinkage and 28 days compressive strength of geopolymer pastes. The results of these analysis has showed that bauxite and oyster shells are source of Al2O3 and CaO respectively, and also contain crystalline phases. The geopolymers obtained by mixing metakaolin and bauxite have their setting time between 235 and 420min and their compressive strength between 40 and 57MPa ; for those obtained by mixing metakaolin and oyster shell the setting time is between 330 and 485min and compressive strength between 40 and 58MPa . The addition of a moderate amount (20% by mass) of bauxite or oyster shell led to improve the compressive strength of a metakaolin-based geopolymer of 43% (metakaolin-bauxite-based geopolymers) and 45% (metakaolin-oyster shell-based geopolymers) and decrease the linear shrinkage. More than 20% mineral additive has a deleterious effect on compressive strength and increase the setting time. Keywords: Metakaolin ; Bauxite ; Oyster shell ; synthesis ; Optimization; Geopolymer cements.

    Item Type: Thesis (Masters)
    Uncontrolled Keywords: Metakaolin; Bauxite; Oyster shell; synthesis; Optimization; Geopolymer cements.
    Subjects: 500 Natural sciences and mathematics > 540 Chemistry and allied sciences
    600 Technology (Applied sciences) > 690 Buildings
    Divisions: Africa > Cameroon > Université de Yaoundé 1 (UY1) > Faculté des Sciences
    Depositing User: Master Enselme Kengne
    Date Deposited: 05 Oct 2013 17:41
    Last Modified: 05 Oct 2013 17:41
    URI: http://eprints.campuce.org/id/eprint/88

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