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    Eco-efficient Self-compacting Concrete with Reduced Portland Cement Content and High Volume of Fly Ash and Metakaolin

    TitleEco-efficient Self-compacting Concrete with Reduced Portland Cement Content and High Volume of Fly Ash and Metakaolin
    Publication TypePapers in International Journals
    Year of Publication2014
    AuthorsAnjos M. A. S., Camões A., and Jesus C. M. G.
    Abstract

    The eco-efficient, self-compacting concrete (SCC) production, containing low levels of cement in its formulation, shall contribute for the constructions' sustainability due to the decrease in Portland cement use, to the use of industrial residue, for beyond the minimization of the energy needed for its placement and compaction. In this context, the present paper intends to assess the viability of SCC production with low cement levels by determining the fresh and hardened properties of concrete containing high levels of fly ash (FA) and also metakaolin (MK). Hence, 6 different concrete formulations were produced and tested: two reference concretes made with 300 and 500 kg/m3 of cement; the others were produced in order to evaluate the effects of high replacement levels of cement. Cement replacement by FA of 60% and by 50% of FA plus 20% of MK were tested and the addition of hydrated lime in these two types of concrete were also studied. To evaluate the self-compacting ability slump flow test, T500, J-ring, V-funnel and L-box were performed. In the hardened state the compressive strength at 3, 7, 14, 21, 28 and 90 days of age was determined. The results showed that it is possible to produce low cement content SCC by replacing high levels of cement by mineral additions, meeting the rheological requirements for self-compacting, with moderate resistances from 25 to 30 MPa after 28 days.

    JournalKey Engineering Materials
    VolumeVolume 634
    EditionTrans Tech Publications Ltd, Switzerland
    Pagination172-181
    Date Published2014-12-11
    ISSN1662-9795
    DOI10.4028/www.scientific.net/KEM.634.172
    URLhttp://www.scientific.net/KEM.634.172
    KeywordsEco-efficient concrete, high-volume fly ash and metakaolin
    RightsrestrictedAccess
    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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