Self-healing assessment and variability in plain and recycled tyre fiber reinforced concrete based on tensile splitting test

This research investigates the objectivity of current methodologies to assess self-healing ability in Fiber Reinforced Concrete (FRC) when compared to a traditional Reference Concrete (REF). FRC was obtained by partially substituting of natural aggregates with Electric Arc Furnace Slag (EAFS) and Fl...

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Bibliographic Details
Published in:Journal of Building Engineering 2024-05, Vol.84, p.108567, Article 108567
Main Authors: Neves, Ana, Almeida, João A.P.P., Miranda, Tiago, Cunha, Vitor M.C.F., Pereira, Eduardo
Format: Article
Language:English
Subjects:
Electric arc furnace slag
Fly ash
Industrial by-products
Recycled tyre steel fibers
Self-healing
Water permeability
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Summary:This research investigates the objectivity of current methodologies to assess self-healing ability in Fiber Reinforced Concrete (FRC) when compared to a traditional Reference Concrete (REF). FRC was obtained by partially substituting of natural aggregates with Electric Arc Furnace Slag (EAFS) and Fly Ash (FA), and Recycled Tyre Steel Fibers (RTSF) were incorporated in order to maximize the incorporation of non-biodegradable waste. Self-healing was evaluated by measuring the water permeability and by visual inspection of cracks, with both a digital microscope and the use of a Linear Variable Differential Transducers (LVDTs) during the tensile splitting test. The results of this assessment are intended to provide improvements in self-healing assessment methodologies based on cracking imaging and the water permeability test. The composition of the FRC_EAFS concrete, with a maximum EAFS and FA content of 70% and 10%, respectively, had lower compressive and tensile splitting strength compared to the REF concrete, which was compensated by the improved ductility and energy absorption capacity under compressive loading. Permeability recovery was only accomplished by REF mixture. •Self-healing assessment frequently leads to substantial variability of results.•The alternative strategies enabled the objective analysis of self-healing properties.•EAFS and untreated recycled tyre steel fibres (RTSF) were analysed.•The approaches tested were sensitive to the different types of concretes analysed.
ISSN:2352-7102
2352-7102
DOI:10.1016/j.jobe.2024.108567