scholarly journals The compressive strength of steel fibre reinforced concrete obtained by testing cubes and cylinders

2021 ◽  
Vol 350 ◽  
pp. 00008
Author(s):  
Alena Sadouskaya ◽  
Syarhei Leanovich ◽  
Neli Budrevich ◽  
Elena Polonina
Keyword(s):  
Compressive Strength ◽  
Reinforced Concrete ◽  
Steel Fibre ◽  
Fiber Reinforced Concrete ◽  
Fibre Reinforced Concrete ◽  
Fiber Reinforced ◽  
Steel Fibre Reinforced Concrete ◽  
Factors Influencing ◽  
Compressive Strength Of Concrete ◽  
Concrete Testing

There are two most popular approaches to determining the compressive strength of concrete: testing cubes, testing cylinders. The use of different samples gives different results, which are intended to characterize one parameter of the material compressive strength. The article discusses a general approach to determining the compressive strength of cylinders and cubes. The analysis of the factors influencing the transition coefficients when testing the cylinder samples with the ratio of height to diameter is less than 2. The results of testing cubes and cylinders for compression made of fiber-reinforced concrete are presented.

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.

Mechanical Properties of Polypropylene Fiber Concrete after High Temperature

2014 ◽  
Vol 662 ◽  
pp. 24-28 ◽  
Author(s):  
Xi Du ◽  
You Liang Chen ◽  
Yu Chen Li ◽  
Da Xiang Nie ◽  
Ji Huang
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Reinforced Concrete ◽  
Polypropylene Fiber ◽  
Plain Concrete ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
Fiber Concrete ◽  
Compressive Strength Of Concrete ◽  
Polypropylene Fiber Reinforced Concrete

With cooling tests on polypropylene fiber reinforced concrete and plain concrete that were initially subjected to different heating temperatures, the change of mechanical properties including mass loss, uniaxial compressive strength and microstructure were analyzed. The results show that the compressive strength of concrete tend to decrease with an increase in temperature. After experiencing high temperatures, the internal fibers of the polypropylene fiber reinforced concrete melted and left a large number of voids in it, thereby deteriorating the mechanical properties of concrete.

scholarly journals Experimental Study on Functionally Graded Steel Fibre Reinforced Preplaced Aggregate Concrete

2018 ◽  
Vol 7 (3.12) ◽  
pp. 456 ◽  
Author(s):  
Ram Prasad. K ◽  
Murali. G ◽  
Parthiban Kathirve ◽  
Haridharan M K ◽  
Karthikeyan. K
Keyword(s):  
Compressive Strength ◽  
Reinforced Concrete ◽  
Steel Fibre ◽  
Functionally Graded ◽  
Fibre Reinforced Concrete ◽  
Average Amount ◽  
Aggregate Concrete ◽  
Steel Fibre Reinforced Concrete ◽  
Conventional Steel ◽  
Functionally Graded Steel

This study examines compressive strength of this functionally graded steel fibre reinforced concrete (FGFRPAC). A five mixes were prepared and tested in the present study. The first series of FGFRPAC were prepared and reinforced in three layers of 3%, 1.5% and 3% with crimped, hooked end. The second series were reinforced with 2.5% steel fibre equally in all the three layers. The average amount of fibre used in FGFRPAC specimen was 2.5% which is similar to the fibre dosage used in the second series were the fibres are equally spread in all the three layers. The gathered results revealed that employing FGFRPAC leads to more enhancement in compressive strength than conventional steel fibre reinforced concrete.

Influence of yield stress and compressive strength on direct shear behaviour of steel fibre-reinforced concrete

2012 ◽  
Vol 27 (1) ◽  
pp. 6-14 ◽  
Author(s):  
Bensaid Boulekbache ◽  
Mostefa Hamrat ◽  
Mohamed Chemrouk ◽  
Sofiane Amziane
Keyword(s):  
Compressive Strength ◽  
Reinforced Concrete ◽  
Yield Stress ◽  
Steel Fibre ◽  
Shear Behaviour ◽  
Fibre Reinforced Concrete ◽  
Direct Shear ◽  
Steel Fibre Reinforced Concrete

scholarly journals Compressive Strength Assessment using GGBS and Randomly Distributed Fibers in Concrete

2019 ◽  
Vol 9 (2) ◽  
pp. 1078-1086
Keyword(s):  
Compressive Strength ◽  
Reinforced Concrete ◽  
Cement Content ◽  
Construction Material ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
Strength Assessment ◽  
Compressive Strength Of Concrete ◽  
By Products

India is producing enormous amounts of industrial by-products out of which 150 million tonnes of GGBS itself. Apart from disposal of this solid waste, engineers strive for its value addition through its use as a construction material for achieving better economy, eco-friendliness without compromising on technical aspects. In this study, varieties of concrete are mixed with GGBS as a replacement material for cement to understand its compressive strength and long term behaviour. It is seen from literature that the fibers enhance the performance of concrete. Accordingly, six trials were made with GGBS replacement along with variation of cement content, water cement ratio and steel fibers with aspect ratio 60 and variation in reinforcing indices. The workability of concrete increased with increasing the GGBS content and also observed there is a reduction in workability in fiber reinforced concrete. The results indicated that the concrete made with GGBS indicates the strength comparable to the concrete made with OPC for all replacement levels. There is a substantial decrease in strength at 80% replacement. While there is a substantial increase in long-term strength. The compressive strength of GGBS concrete was increased up to 19% than that of OPC concrete and also observed 5 to 12% strength increased in fiber reinforced concrete than GGBS concrete. For this purpose studied the compressive strength of concrete at the ages of 3, 7,28,56,90 and 180 days.

scholarly journals Flexural Capacity Prediction Model For Steel Fibre-Reinforced Concrete Beams

2021 ◽  
Vol 15 (1) ◽  
Author(s):  
Aocheng Zhong ◽  
Massoud Sofi ◽  
Elisa Lumantarna ◽  
Zhiyuan Zhou ◽  
Priyan Mendis
Keyword(s):  
Compressive Strength ◽  
Reinforced Concrete ◽  
Prediction Model ◽  
Steel Fibre ◽  
Concrete Beams ◽  
Steel Reinforcement ◽  
Reinforced Concrete Beams ◽  
Fibre Reinforced Concrete ◽  
Steel Fibre Reinforced Concrete ◽  
Conventional Steel

AbstractSteel fibre (SF) reinforcement has been shown to improve the ductility of high strength concrete (HSC), which is known to be brittle. Research conducted to date on steel fibre reinforced concrete and its effects have emphasised post-failure performance and cracking mechanism. The difficulty in predicting the behaviour of fibres is due to the randomly distributed nature of the material within the matrix leading to a probability distribution of results. Published literature has shown a benefit of adding steel fibres in terms of the ductility performance of structures. Clearly, there is a potential for such material as replacement of conventional steel reinforcement. This study proposes a theoretical model of evaluating the potential of using steel fibres as a replacement material to conventional steel reinforcement bars based on the case study, laboratory and theoretical methodologies. The compressive strength of the concrete at key dates, the effective fibre cross-sectional were measured, and a prediction model was created based on the measurement parameters. The use of four-point flexural testing, standard compressive testing and software image modelling provided the study with relevant data used to analyse and compare to the prediction. Greater ductility performance and toughness were observed with increased fibre volumes, confirming proposed predictions and conclusion drawn from published literature. No consistent or conclusive correlations between fibre volumes and the compressive strength of concrete were found. A relationship between fibre volumes and predicted moment capacities of steel fibre reinforced concrete beams was found based on the proposed theoretical flexural analysis method.

scholarly journals Influence of Steel Fibers on the Account of Permeability Aspects of M20 and M40 Grade Concrete

2019 ◽  
Vol 8 (4S2) ◽  
pp. 53-55 ◽  
Keyword(s):  
Reinforced Concrete ◽  
Steel Fibre ◽  
Volume Fraction ◽  
Fiber Reinforced Concrete ◽  
Steel Fibers ◽  
Fibre Reinforced Concrete ◽  
Permeability Test ◽  
Test Apparatus ◽  
Steel Fibre Reinforced Concrete ◽  
Mathematical Equations

Steel Fibre Reinforced Concrete is used in a number of applications such as ground slabs, shotcrete, pavements etc to enhance the performance of plain and reinforced concrete. The study on durability characteristics of fiber reinforced concrete is scanty and hence the study on permeability is essential. This paper deals with the study on the permeability of steel fibre reinforced concrete. Deformed Steel fibres with different volume fraction were used in this study. Permeability was observed to decrease significantly with the addition of fibres and it continued to decrease with the increase in fibre content. Permeability tests were conducted using permeability test apparatus as per IS 3085 -1965. Mathematical equations were derived to determine the permeability using the parameters, volume fraction of fibers,and age of curing.

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