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    Drying shrinkage performance of fly ash geopolymer mortars reinforced with hybrid fibres

    ProjectIF/00706/2014-UM.1.15
    TitleDrying shrinkage performance of fly ash geopolymer mortars reinforced with hybrid fibres
    Publication TypePapers in International Journals
    Year of Publication2017
    AuthorsKheradmand M., Abdollahnejad Z., and Pacheco-Torgal, F.
    Abstract

    Drying shrinkage performance is a very important factor for reinforced concrete composites because a high shrinkage performance is associated with a high cracking tendency, which leads to future durability problems. Geopolymeric mortars show much higher drying shrinkage than Portland cement-based composites because they use a low amount of structural water and thus have a higher pore content than ordinary Portland cement composites. Therefore, the use of fibres is especially interesting to counteract the drying shrinkage tendency of geopolymeric mortars. This paper provides results on the restrained and unrestrained shrinkage performance of fly ash-based geopolymeric mortars reinforced with short polymer hybrid fibres (SPHF). The results show that SPHF reduces the shrinkage cracking tendency. A content of SPHF as low as 0·08% was able to reduce the average crack width by four times when compared with non-reinforced mortars. Increasing the content of SPHF from 0·08 to 0·8% reduces the time of appearance of the first crack by 25 h and reduces the average crack width by two times.

    JournalICE: Construction Materials
    Pagination1-13
    Date Published2017-08-05
    PublisherInstitution of Civil Engineers
    ISSN1747650X, 17476518
    KeywordsFly ash, Geopolymers, Modulus of elasticity, short polymer hybrid fibres, Shrinkage, Waste reuse
    RightsembargoedAccess (2 Years)
    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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