An experimental investigation into the tensile strength of steel fibre reinforced concrete

2012 ◽  
pp. 1097-1103
Author(s):  
A Amin ◽  
S Foster ◽  
D Boillet ◽  
A Muttoni
Keyword(s):  
Experimental Investigation ◽  
Tensile Strength ◽  
Reinforced Concrete ◽  
Steel Fibre ◽  
Fibre Reinforced Concrete ◽  
Steel Fibre Reinforced Concrete

scholarly journals Experimental Investigation of Shear Strength for Steel Fibre Reinforced Concrete Beams

2021 ◽  
Vol 15 (1) ◽  
pp. 81-92
Author(s):  
Constantinos B. Demakos ◽  
Constantinos C. Repapis ◽  
Dimitros P. Drivas
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Shear Strength ◽  
Reinforced Concrete ◽  
Steel Fibre ◽  
Concrete Beams ◽  
Reinforced Concrete Beams ◽  
Fibre Reinforced Concrete ◽  
Steel Fibres ◽  
Steel Fibre Reinforced Concrete

Aims: The aim of this paper is to investigate the influence of the volume fraction of fibres, the depth of the beam and the shear span-to-depth ratio on the shear strength of steel fibre reinforced concrete beams. Background: Concrete is a material widely used in structures, as it has high compressive strength and stiffness with low cost manufacturing. However, it presents low tensile strength and ductility. Therefore, through years various materials have been embedded inside it to improve its properties, one of which is steel fibres. Steel fibre reinforced concrete presents improved flexural, tensile, shear and torsional strength and post-cracking ductility. Objective: A better understanding of the shear performance of SFRC could lead to improved behaviour and higher safety of structures subject to high shear forces. Therefore, the influence of steel fibres on shear strength of reinforced concrete beams without transverse reinforcement is experimentally investigated. Methods: Eighteen concrete beams were constructed for this purpose and tested under monotonic four-point bending, six of which were made of plain concrete and twelve of SFRC. Two different aspect ratios of beams, steel fibres volume fractions and shear span-to-depth ratios were selected. Results: During the experimental tests, the ultimate loading, deformation at the mid-span, propagation of cracks and failure mode were detected. From the tests, it was shown that SFRC beams with high volume fractions of fibres exhibited an increased shear capacity. Conclusion: The addition of steel fibres resulted in a slight increase of the compressive strength and a significant increase in the tensile strength of concrete and shear resistance capacity of the beam. Moreover, these beams exhibit a more ductile behaviour. Empirical relations predicting the shear strength capacity of fibre reinforced concrete beams were revised and applied successfully to verify the experimental results obtained in this study.

Experimental study of the tensile and flexural mechanical properties of directionally distributed steel fibre-reinforced concrete

2018 ◽  
Vol 233 (9) ◽  
pp. 1721-1732 ◽  
Author(s):  
Fangyuan Li ◽  
Yunxuan Cui ◽  
Chengyuan Cao ◽  
Peifeng Wu
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Reinforced Concrete ◽  
Steel Fibre ◽  
Plain Concrete ◽  
Design Parameters ◽  
Fibre Reinforced Concrete ◽  
Split Tensile Strength ◽  
Fibre Direction ◽  
Steel Fibre Reinforced Concrete

Directionally distributed steel fibre-reinforced concrete has been proposed as a novel concrete because of its high tensile strength and crack resistance in specific directions. Based on the existing studies of the effect of the fibre direction on the mechanical properties of fibre-reinforced concrete, the authors in this paper performed further studies of the mechanical properties of directionally distributed steel fibre-reinforced concrete by conducting split tensile and bending tests. The split tensile strength of the directionally distributed fibre-reinforced concrete clearly exhibited anisotropy. The split tensile strength perpendicular to the fibre direction was much higher than that parallel to the fibre direction. The split tensile strength perpendicular to the fibre direction was almost twice the tensile strength of plain concrete. The flexural performance of directionally distributed fibre-reinforced concrete in the fibre direction significantly improved compared to that of randomly distributed fibre-reinforced concrete. Specifically, the flexural strength increased by as much as 97%. Gravity resulted in a deviation in the tensile properties of concrete prepared by manually and directionally placing fibres in a layered casting process. The test results can be utilised in subsequent concrete designs. The conclusions reached in this paper provide comprehensive mechanical design parameters for the application of directionally distributed fibre-reinforced concrete.

Influence of Steel Fibres in Steel Fibre Reinforced Concrete on ULS and SLS

2017 ◽  
Vol 259 ◽  
pp. 52-57
Author(s):  
Jan Fleissig
Keyword(s):  
Tensile Strength ◽  
Reinforced Concrete ◽  
Physical Properties ◽  
Steel Fibre ◽  
Point Of View ◽  
Fibre Reinforced Concrete ◽  
Steel Fibre Reinforced Concrete ◽  
Bending Load ◽  
Mechanical And Physical Properties ◽  
Effectiveness Assessment

The steel fibre reinforced concrete is expensive compared with the ordinary concrete. The costs for the production, the transport and the setting of steel fibre reinforced concrete should be directly proportional to its quality. The quality of material can be quantified in a broad spectrum of properties (the workability, the mechanical and physical properties, the durability, etc.). This article is focused on the influence of mechanical and physical properties (the tensile strength and the residual tensile strength) on ULS and SLS. The paper is limited only to the bending load bearing capacity from ULS point of view and limited only to vertical deformation from SLS point of view. The example is a part of paper – the calculation of two bending structures. Firstly, it is calculated as the structure of ordinary reinforced concrete and secondly it is calculated as the structure of reinforced steel fibre reinforced concrete. The geometric arrangement, the type and the quantity of reinforcement are identical for both calculated structures. The calculated structures are different only in the tensile strength and the residual tensile strength. All other input parameters (including modulus of elasticity) are identical for both calculated structures, in order the influence of tensile strength on ULS and SLS excels. The presented results should be the basic concept for the effectiveness assessment of steel fibre reinforced concrete application.

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