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    Papers in International JournalsChapters/ Papers in International BooksChapters/ Papers in National BooksCommunications in International ConferencesCommunications in National ConferencesMSc ThesesBooksProceedingsPatentsTechnical/ Scientific ReportsPhD Theses
    @JournalArticle {2692,
    	title = {Red mud-based geopolymers with tailored alkali diffusion properties and pH buffering ability},
    	journal = {Journal of Cleaner Production},
    	volume = {148},
    	year = {2017},
    	month = {2017-03-01 00:00:00},
    	pages = {23-30},
    	publisher = {Elsevier Science},
    	abstract = {

    This study develop novel porous red mud (RM) based geopolymers and evaluates their potential to ensure prolonged pH control. Several properties of the novel geopolymers were examined including buffering ability, alkalis leaching behaviour, mineralogical composition, microstructure and physical properties. Two experimental plans were defined to evaluate the influence of porosity and RM content on those properties. The pH values of the eluted water and geopolymers OH ions leaching have been determined over time showing that total OH ions and the leaching rate can be tailored by controlling the geopolymers porous structure and the availability of free alkaline species. The lower pH gradient over 28th d (1.64 pH units) was achieved by combining a 0.025 wt\% pore forming agent (aluminium powder) with 45 wt\% MK replacement by red mud.
    A high and prolonged buffer capacity was accomplished, proving that red mud-based geopolymers have potential to be applied as pH buffering material.

    }, keywords = {Alkali leaching, Geopolymer, pH buffering, Red mud}, issn = {0959-6526}, doi = {10.1016/j.jclepro.2017.01.150}, url = {https://doi.org/10.1016/j.jclepro.2017.01.150}, author = {Ascens{\~a}o, G. and Seabra, M. P. and Aguiar, J. B. and Labrincha, J. A.} }

    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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    Centro de Território, Ambiente e Construção
    Escola de Engenharia da Universidade do Minho
    Campus de Azurém
    4800-058 Guimarães, Portugal

    Phone: + 351 253 510 200 (517 206)
    Fax: + 351 253 510 217

    Email: geral@ctac.uminho.pt


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