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    Advantages and shortcomings of the utilization of recycled wastes as aggregates in structural concretes

    TitleAdvantages and shortcomings of the utilization of recycled wastes as aggregates in structural concretes
    Publication TypePapers in International Journals
    Year of Publication2021
    AuthorsMirado S., Lopes S., Pacheco-Torgal, F., and Lopes A.
    Abstract

    Global material resources are quickly being drained by the demands of global economic development.
    Simultaneously, the environmental impacts of the massive amounts of waste generated globally every
    year are also growing exponentially. As such, the implementation of waste recycling through its utilization
    as a component of a construction material, particularly one with a global demand as high as concrete,
    is a strategy which acts in both planes: material efficiency and waste generation. This paper details the
    results of a systematic review performed on the scientific literature that concerns the possibility of incorporating
    recycled wastes as aggregates in structural ordinary Portland cement concretes. The available
    literature suggests that a reduced number of wastes of recycled origin may, albeit in low quantities, be
    used in structural OPC concretes. Furthermore, the presence of substances such as glass wastes or
    alkali-rich cement fragments in recycled aggregates elevates the potential for expansions originated by
    the occurrence, in these concretes, of the well known phenomenon known as alkali-silica reaction.
    Moreover, the variety, quantity and the limits to the utilization of these wastes as aggregates in structural
    concretes all suggest that a massification of the utilization of recycled aggregates in OPC concretes will
    not take place. The investigation also found that, in light of the evidence showing that the performance
    of alkali-activated binder concretes is less impacted by the shortcomings of recycled aggregates, recycled
    wastes may be better suited for reutilization as aggregates in these concrete compositions.

    JournalConstruction and Building Materials
    Volume298
    Pagination123729
    Date Published2021-06-11
    PublisherElsevier
    DOI10.1016/j.conbuildmat.2021.123729
    KeywordsAlkali-activated concrete, Construction and demolition waste, Recycled aggregates, Waste recycling
    RightsopenAccess
    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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