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Experimental Investigation on Structural Fibrous Concrete with Polyolefin - Steel Hybrid Fibres

JASEM Front Page
Author(s):
Eswari.S,Natarajan.N,Deepan.P
Volume
1, No.1
Pages:
144-149
Year of Publication:
2015
Journal of Applied Science and Engineering Methodologies
ISSN:
2395–5341
Citation: Eswari,S.,Natarajan,N.,Deepan,P.(2015).Experimental Investigation on Structural Fibrous Concrete with Polyolefin - Steel Hybrid Fibres . Journal of Applied Science and Engineering Methodologies,Vol.1,No.1,pp.144-149.
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Abstract:
This paper presents the experimental results on the hybrid fibre reinforced concrete (HFRC) with hybrid fibres. A total of 30 concrete specimens were tested to study the effect of hybrid fibre reinforcement on the flexural performance of fibre reinforced concrete. The fibre content dosage Vf ranged from 0.0 to 2.0%. Steel and Polyolefin fibres were combined in different proportions and their impact on strength and ductility studied. Addition of 2.0% by volume of hybrid fibres increases the above study parameters appreciably, when compared to the plain concrete. Empirical expressions for predicting the strength property of hybrid fibre reinforced concrete (HFRC) is proposed based on regression analysis.
Keywords: Compressive strength; Ductility; Hybrid fibre reinforced concrete; Modulus of rupture; Polyolefin fibre; Steel fibre.
I.Introduction
Concrete is a relatively brittle material, addition of fibres to concrete makes it more homogeneous and isotropic and transforms it from a brittle to a more ductile material1-3. The basic purpose of using hybrid fibres is to control cracks at different size levels, in different zones of concrete (cement paste or interface zone between paste and aggregate) and at different loading stages. The large and strong fibres control large cracks. The small and soft fibres control crack initiation and propagation of small cracks4-6. This research work focuses on the polyolefin-steel hybrid fibres reinforced system. It has been shown recently that the hybrid composite can offer more attractive engineering properties because the presence of one fibre enables more efficient utilization of the potential properties of the other fibre7.. However, the hybrid composites studied by previous researchers were focused on cement paste or mortar. Information available pertaining to the strength and ductility properties of hybrid fibre reinforced concrete is found to be limited. Hence an attempt has been made to study the strength and ductility properties of hybrid fibre reinforced concrete. A total of 30 specimens were cast and tested to determine the impact of hybrid fibres on the strength and ductility of fibre reinforced concrete (FRC).

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