This work investigates the effect of a fast, acid-catalysed sol-gel silica nano-coating on the mechanical performance of draw-wire Polypropylene (PP) fibres used as dispersed reinforcement in Fibre Reinforced Concrete (FRC). The failure mechanism is investigated. To this aim, the role of curing time is also considered. Mechanical performance is assessed in pull-out and three-point bending tests of un-notched beams. Coating deeply affects the post-cracking behaviour of FRC, which shifts from brittle (plain concrete), to softening (uncoated) and finally to plastic-softening (coated fibres). Remarkably, 28-day curing improves over 8-day curing in terms of energy dissipation capability for coated fibres only. This suggests that fibre-to-matrix bond enhancement moves the failure mechanism from delamination at the interface to failure in the interphase zone. In the former case, failure is inconsistent and occurs independently from the curing time while in the latter failure depends on the matrix quality.

Failure mechanism of silica coated polypropylene fibres for Fibre Reinforced Concrete (FRC) / Signorini, C.; Sola, A.; Malchiodi, Beatrice; Nobili, A.; Gatto, A.. - In: CONSTRUCTION AND BUILDING MATERIALS. - ISSN 0950-0618. - 236:(2020), pp. 117549-117549. [10.1016/j.conbuildmat.2019.117549]

Failure mechanism of silica coated polypropylene fibres for Fibre Reinforced Concrete (FRC)

Signorini C.
;
Sola A.;MALCHIODI, BEATRICE;Nobili A.;Gatto A.
2020

Abstract

This work investigates the effect of a fast, acid-catalysed sol-gel silica nano-coating on the mechanical performance of draw-wire Polypropylene (PP) fibres used as dispersed reinforcement in Fibre Reinforced Concrete (FRC). The failure mechanism is investigated. To this aim, the role of curing time is also considered. Mechanical performance is assessed in pull-out and three-point bending tests of un-notched beams. Coating deeply affects the post-cracking behaviour of FRC, which shifts from brittle (plain concrete), to softening (uncoated) and finally to plastic-softening (coated fibres). Remarkably, 28-day curing improves over 8-day curing in terms of energy dissipation capability for coated fibres only. This suggests that fibre-to-matrix bond enhancement moves the failure mechanism from delamination at the interface to failure in the interphase zone. In the former case, failure is inconsistent and occurs independently from the curing time while in the latter failure depends on the matrix quality.
2020
19-nov-2019
236
117549
117549
Failure mechanism of silica coated polypropylene fibres for Fibre Reinforced Concrete (FRC) / Signorini, C.; Sola, A.; Malchiodi, Beatrice; Nobili, A.; Gatto, A.. - In: CONSTRUCTION AND BUILDING MATERIALS. - ISSN 0950-0618. - 236:(2020), pp. 117549-117549. [10.1016/j.conbuildmat.2019.117549]
Signorini, C.; Sola, A.; Malchiodi, Beatrice; Nobili, A.; Gatto, A.
File in questo prodotto:
File Dimensione Formato  
FRC_silica.pdf

Accesso riservato

Descrizione: Articolo principale
Tipologia: Versione dell'autore revisionata e accettata per la pubblicazione
Dimensione 8.23 MB
Formato Adobe PDF
8.23 MB Adobe PDF   Visualizza/Apri   Richiedi una copia
Pubblicazioni consigliate

Licenza Creative Commons
I metadati presenti in IRIS UNIMORE sono rilasciati con licenza Creative Commons CC0 1.0 Universal, mentre i file delle pubblicazioni sono rilasciati con licenza Attribuzione 4.0 Internazionale (CC BY 4.0), salvo diversa indicazione.
In caso di violazione di copyright, contattare Supporto Iris

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/1184594
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 40
  • ???jsp.display-item.citation.isi??? 35
social impact