Hybrid fibre-reinforced geopolymer (HFRG) composites as an emerging material in retrofitting aging and seismically-deficient concrete and masonry structures

Ernesto Guades*, Henrik Stang, Gregor Fisher, Jacob Schmidt

*Corresponding author for this work

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    Abstract

    Fibre-reinforced polymer (FRP) systems have recently become popular in repairing concrete or masonry structures because of their inherent advantages. In spite of these benefits, FRPs have drawbacks having low fire resistance, poor environmental sustainability and incompatibilty with the substrate concrete. The effort to address these issues has led to the development of an emerging strain hardening cementitious (SHC) material using an inorganic polymer known as hybrid fibre-reinforced geopolymer (HFRG) composites. Compared with cement-based SHC composites, HFRG has better bond performance to concrete substrates, higher fire resistance, greater corrosion durability and helps to reduce CO2 emissions. This paper reviews the recent development of HFRG composites as an emerging repair material. Literature reveals that flowability of a fresh HFRG mixture decreases with increasing fibre content though still workable up to 2% fibre volume. Fibre synergy could result in 10–181% higher flexural toughness of geopolymer composites than when just using mono fibres. The application of HFRG composites to RC beams increased displacement ductility by to 263%. To date, there has been no reported field application of HFRG as a repair material though mono-fibre FRG has been field-applied as a strengthening material in large-diameter sewer RC pipes, RC culverts, RC sewerage manholes and dam surface improvement.
    Original languageEnglish
    Article number04003
    JournalMATEC Web of Conferences
    Volume289
    Number of pages8
    ISSN2261-236X
    DOIs
    Publication statusPublished - 2019
    EventConcrete Solutions: 7th International Conference on Concrete Repair - Technical University of Cluj Napoca, Cluj-Napoca, Romania
    Duration: 30 Sep 20192 Oct 2019
    Conference number: 7

    Conference

    ConferenceConcrete Solutions
    Number7
    LocationTechnical University of Cluj Napoca
    Country/TerritoryRomania
    CityCluj-Napoca
    Period30/09/201902/10/2019

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