Title:
Effect of steel fibres on the tensile behaviour of self-consolidating reinforced concrete blocks
Author(s):
Romildo Dias Toledo Filho; Ederli Marangon; Flávio de Andrade Silva; Barzin Mobasher
Publication:
Symposium Paper
Volume:
310
Issue:
Appears on pages(s):
123-130
Keywords:
Steel fibres, concrete, tensile behaviour, structural tests.
DOI:
Date:
3/17/2017
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.