Effect of steel fibres on the tensile behaviour of self-consolidating reinforced concrete blocks

Romildo Dias Toledo Filho, Ederli Marangon, Flávio De Andrade Silva, Barzin Mobasher

Research output: Contribution to journalConference article

Abstract

This paper reports the recent findings of an experimental investigation on the influence of steel fibres in RC blocks under quasi static direct tensile loading. Structural blocks were designed with rebar reinforcement ratios of 0.40, 0.63 and 1.00%. A structural direct tensile testing system was developed at the COPPE laboratories resulting in a state-of-the-art in house apparatus. The RC blocks were reinforced with 1.25% volume fraction of steel fibres and without any type of fibre reinforcement and then tested until a strain level of approximately 0.0015mm/mm. The results show that the steel fibres improved the stress transfer efficiency between the rebars and the concrete matrix. By partially replacing the rebars by steel fibres the ductility of the concrete block was augmented and the post-crack stiffness increased. These results and possible mechanisms are discussed on the basis of the observed crack patterns, deformation measured on the steel rebars, computed deformation of the concrete matrix and on the overall mechanical behaviour of the composite concrete block.

Original languageEnglish (US)
Pages (from-to)123-130
Number of pages8
JournalAmerican Concrete Institute, ACI Special Publication
Volume2014-July
Issue numberSP 310
StatePublished - Jan 1 2014
EventJoint ACI-fib International Workshop on Fibre-Reinforced Concrete: From Design to Structural Applications, FRC 2014 - Montreal, Canada
Duration: Jul 24 2017Jul 25 2017

Fingerprint

Concrete blocks
Steel fibers
Reinforced concrete
Concretes
Cracks
Steel
Tensile testing
Fiber reinforced materials
Ductility
Volume fraction
Reinforcement
Stiffness
Composite materials

Keywords

  • Concrete
  • Steel fibres
  • Structural tests
  • Tensile behaviour

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Materials Science(all)

Cite this

Effect of steel fibres on the tensile behaviour of self-consolidating reinforced concrete blocks. / Filho, Romildo Dias Toledo; Marangon, Ederli; De Andrade Silva, Flávio; Mobasher, Barzin.

In: American Concrete Institute, ACI Special Publication, Vol. 2014-July, No. SP 310, 01.01.2014, p. 123-130.

Research output: Contribution to journalConference article

Filho, Romildo Dias Toledo ; Marangon, Ederli ; De Andrade Silva, Flávio ; Mobasher, Barzin. / Effect of steel fibres on the tensile behaviour of self-consolidating reinforced concrete blocks. In: American Concrete Institute, ACI Special Publication. 2014 ; Vol. 2014-July, No. SP 310. pp. 123-130.
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N2 - This paper reports the recent findings of an experimental investigation on the influence of steel fibres in RC blocks under quasi static direct tensile loading. Structural blocks were designed with rebar reinforcement ratios of 0.40, 0.63 and 1.00%. A structural direct tensile testing system was developed at the COPPE laboratories resulting in a state-of-the-art in house apparatus. The RC blocks were reinforced with 1.25% volume fraction of steel fibres and without any type of fibre reinforcement and then tested until a strain level of approximately 0.0015mm/mm. The results show that the steel fibres improved the stress transfer efficiency between the rebars and the concrete matrix. By partially replacing the rebars by steel fibres the ductility of the concrete block was augmented and the post-crack stiffness increased. These results and possible mechanisms are discussed on the basis of the observed crack patterns, deformation measured on the steel rebars, computed deformation of the concrete matrix and on the overall mechanical behaviour of the composite concrete block.

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