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    Investigations of geopolymeric mixtures based on phosphate washing waste

    TitleInvestigations of geopolymeric mixtures based on phosphate washing waste
    Publication TypePapers in International Journals
    Year of Publication2018
    AuthorsDabbebi R., s. Baklouti, Aguiar, J. B., Pacheco-Torgal, F., and Samet B.
    Abstract

    The extraction of the phosphate ore produces a high amount of waste causing serious environmental problems. This waste, termed as phosphate washing waste, was filtered and dried at 105 °C for 24 h to remove the water. The dried waste was milled and then sieved in a 100 μm sieve. The resulting phosphates washing waste (PWW) particles size are below 70 μm. The phosphate washing waste was calcined at 700 °C and 900 °C. Both calcined and uncalcined waste were investigated with X-ray fluorescence (XRF), X-ray powder diffraction (DRX), Fourier transform infrared (FTIR), simultaneous differential thermal and thermogravimetric analyses (DTA-TG) and particle size analysis. This waste was activated with sodium hydroxide (NaOH) and sodium silicate in order to produce geopolymeric materials. The influence of replacing PWW by 15% of metakaolin was also study. The results show that the highest compressive strength is obtained with metakaolin. The results also showed that compressive strength decreased with the increase of NaOH concentration.

    JournalScience and Technology of Materials
    Volume30
    Pagination1-5
    Date Published2018-11-28
    PublisherElsevier
    ISSN2603-6363
    DOI10.1016/j.stmat.2018.08.001
    KeywordsGeopolymer, Phosphate washing waste, Sodium hydroxide, Sodium silicate
    RightsembargoedAccess (6 Months)
    Peer reviewedyes
    Statuspublished
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    About CTAC

    The Centre for Territory, Environment and Construction (CTAC) is a research unit of the School of Engineering of University of Minho (UMinho), recognised by the “FCT – Fundação para a Ciência e Tecnologia” (Foundation for Science and Technology), associated to the Department of Civil Engineering (DEC), with whom it shares resources and namely human resources.

    Currently CTAC aggregates 25 researchers holding a PhD of which 20 are faculty professors of the Civil Engineering Department. Read more


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