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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Structural applicability of polypropylene fibres: Deep and wide-shallow beams subjected to shear
Author(s): Antonio Conforti; Andrea Tinini; Fausto Minelli; Giovanni Plizzari; Sandro Moro
Publication: Special Publication
Appears on pages(s): 171-180
Keywords: Full scale experiments, shear, polypropylene fibres, wide-shallow beams, deep beams.
Abstract:In recent years important efforts have been devoted to develop new types of polypropylene (PP) macro fibres able to provide significant toughness and ductility to concrete. These PP
fibres, which are now widely available in the market, present a series of advantages: a significantly number of fibres per unit volume that allows less variability of experimental
results (hence, higher characteristic values for specific mean values); a higher number of fibres intercepting cracks and controlling their propagation (of outmost importance for early-age shrinkage cracking); last but not least, no corrosion stains at the concrete surface. However, even if several experiments available in literature showed that fibres, if provided in sufficient amount and with an adequate toughness, are significantly effective as shear reinforcement, just few of them focused on the shear behaviour of elements made of polypropylene-fibrereinforced concrete (PFRC). In this context, structural applicability of PP macro fibres, adopted as shear reinforcement, is investigated in this paper. Experimental results of full scale tests on fourteen wide-shallow beams (WSBs) and nineteen deep beams in reinforced concrete (RC)
and PFRC are presented. These results show that, in both beam typologies, the addition of PP fibres significantly enhances both the shear bearing capacity and the ductility. PP fibres can
completely replace and reduce the conventional shear reinforcement in WSBs and deep beams, respectively.
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