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In recent years, self-compacting concrete (SCC) has gained wide use for placement in congested reinforced concrete structures with difficult casting conditions. SCC offers several economical and technical benefits; the use of fibers extends its possibilities. Adjustment of the water/cement ratio and super plasticizer dosage is one of the main key properties in proportioning of SCC mixtures. Several tests such as slump flow, V-funnel, L-box were carried out to determine optimum parameters for the self-compatibility of mixtures. In this article Nylon 300-e3 micro synthetic fiber and Nylon Tuff macro synthetic fiber has used in combination and the effect of fiber inclusion on the compatibility of hybrid fiber reinforcement concrete are studied. Both the Nylon fiber hybrid with SSC and compared to Plan SSC, Hybrid SSC. The behavior of Reinforced Concrete (RC) beams strengthened in flexure by means of different combinations of externally bonded hybrid Glass and Carbon Fiber Reinforced Polymer (GFRP/CFRP) sheets has also studied
Procedia Engineering
Investigation on Flexural Properties of Hybrid Fibre Reinforced Self-compacting Concrete2016 •
International Journal of Scientific Research in Science and Technology IJSRST, Sachin S, Raghavendra D
In early days normal concrete is difficult to place and compaction is required, after using the self-compacting concrete gained popularity due to its higher workability and flowability which reduces compaction. In this study focuses on strength properties of hybrid fiber reinforced self-compacting concrete (combination of crimped steel fiber and polypropylene fiber), combination of these fibers have been tried which effects strength and other properties in different ways. Total fiber content of 0.5%(with steel fiber dosage of 0.3% and polypropylene fiber dosage of 0.2%) was kept constant which results in increasing compressive strength and improvement in flexural and tensile strength which results durability aspects such as shrinkage, bleeding, segregation and the corresponding properties of normal concrete were studied. The age at loading of concrete 7 and 28 days curing for cubes, cylinders and prism. To achieve better work ability and flow ability Super plasticizer of Master Glenium Sky 8630 of 1% for normal concrete and 1.5% for hybrid concrete. Cement has partially replaced by 30% of fly ash, 30% of GGBFS and 10% of micro cement. Workability was reduced when polypropylene fiber used. Addition of increasing super plasticizer dosage from 1% to 1.5% gives work ability and flowability. The study is done for a M40 grade of concrete was designed by using Nan su with w/c of 0.40. Some of the tests conducted on slump flow, L and U box and V funnel to determine the parameters for self compactability of mixtures.
Applied Sciences
Experimental Analysis of Continuous Beams Made of Self-Compacting Concrete (Scc) Strengthened with Fiber Reinforced Polymer (Frp) Materials2021 •
Strengthening of concrete structures is applied as a solution for various deterioration problems in civil engineering practice. This also refers to the structures made of self-compacting concrete (SCC), which is increasingly in use, but there is a lack of research in this field. This paper presents an experimental analysis of flexural behavior of reinforced concrete (RC) continuous beams made of SCC, strengthened with fiber reinforced polymer (FRP) materials (glass (GFRP) and carbon (CFRP) bars, CFRP laminates), by the use of near surface mounted (NSM) and externally bonded (EB) methods. Six two-span continuous beams of a total length of 3200 mm, with the span between supports of 1500 mm and 120/200 mm cross section, were subjected to short-term load and tested. The displacements of beams and the strains in concrete, steel reinforcement, FRP bars and tapes were recorded until failure under a monotonically increasing load. The ultimate load capacities of the strengthened beams were e...
This paper is an attempt to review that study of experimental investigation to find out the optimum mechanical properties of concrete in Self Compacting Concrete (SCC) with mono fiber and hybrid fiber. Due to the use of fly ash, Recron 3s, glass fiber and combination of two fibers, the mechanical properties can be changed. The various combinations of fibers can be taken for testing purpose as range as 0.25-0.75%, 0.5-0.5%, 0.75-0.25% and by volume at a maximum fiber volume fraction of 1%. The main aim of this paper is to identify the effect of filling ability and passing ability of SCC and check SCC with different combination of fibers in same proportion and different proportion. Recron 3s and glass fiber are two fibers used in this research in mono and different combinations.
Strength of Materials
Evaluating Mechanical Properties of Macro-Synthetic Fiber-Reinforced Concrete with Various Types and Contents2017 •
The importance of concrete in development of civilized world can be known from the fact that, concrete is most widely used man-made material on planet and consumption of concrete in world per capita is around 1 ton. Being such a important construction material enhancement of its strength and durability is prime need of hour only by the way of its research and development. The fiber reinforced concrete is collective mixture of primary constituent of concrete such as cement, sand, aggregate, and add on constituent containing short and discrete fiber which can be steel, polypropylene, polythene, nylon etc. Presently there is necessity to find a material or composite material to improve the strength of concrete and its effective utilization. Hence attempt has been made in present quest to study impact of addition of composite fibrous material like steel and polypropylene together as 1% and 1.5% of concrete weight as fiber. The present paper analyzes various researches made on FRC till date and summarizes it useful results and outcomes. The consolidated data from review of these papers is helpful in predicting the behaviour of composite FRC and expected outcomes.
Budownictwo i Architektura
Research on the recycled and hybrid fibre reinforced self-compacting concrete under flexure2020 •
In the present study the steel fibres coming from the end-of-life tires were applied as a reinforcement of self-compacting concrete. The influence of the recycled fibres and their mixture with glass or polypropylene fibres (hybrid mixes) on the flexural behaviour of SCC was tested. The research revealed that the dosage of 1.5% of recycled fibres is highly effective in the SCC matrix. The values of the residual flexural tensile strengths obtained in the tests classified the R-SCC to be used as a partial replacement of the conventional reinforcement. The addition of other types of fibres to R-SCC caused the further enhancement of flexural parameters with no negative effect on the distribution of the fibres in the mix.
A self-compacting concrete (SCC) is the one that can be placed in the form and can go through obstructions by its own weight and without the need of vibration .its first development in Japan in 1988, SCC has gained wider acceptance in Japan, Europe and USA due to its inherent distinct advantages. The major advantage of this method is that SCC technology offers the opportunity to minimize or eliminate concrete placement problems in difficult conditions. It avoids having to repeat the same kind of quality control test on concrete, which consumes both time and labor. Construction and placing becomes faster& easier. It eliminates the need for vibration & reducing the noise pollution. It improves the filling capacity of highly congested structural members. SCC provides better quality especially in the members having reinforcement congestion or decreasing the permeability and improving durability of concrete. The primary aim of this study is to explore the feasibility of using SCC by examining fresh and hardened properties by introducing glass (0.1%) and steel (1.5%) fibers of M40 Grade SCC and comparing the same with M40 Grade Plain SCC. Also, to study the fresh and hardened properties of M80 Grade SCC with varying Packing Factors i.e. 1.12,1.14,1.16,1.18 and comparing the same with M80 Grade conventional concrete When the fiber reinforcement is in the form of short discrete fibers, they act effectively as rigid inclusions in the concrete matrix. Physically, they have thus the same order of magnitude as aggregate inclusions; steel fiber reinforcement cannot therefore be regarded as a direct replacement of longitudinal reinforcement in reinforced and prestressed structural members. However, because of the inherent material properties of fiber concrete, the presence of fibers in the body of the concrete or the provision of a tensile skin of fiber concrete can be expected to improve the resistance of conventionally reinforced structural members to cracking, deflection and other serviceability conditions. Compressive strength of concrete is measured by testing standard cubes (150mm x 150mm x 150mm) at the age of 7 days, 28 days and 90 days, The tests were conducted on varying percentages of steel fibers and studied for their torsional resistance for combined loading under torsion-bending-shear.The existing literature indicates that many researchers have studied the torsional strength, torsion to moment or torsion to shear of steel fiber reinforced concrete beams. However, scanty literature is available on testing of specimen blended with steel crimped fiber and flyash subjected to combined torsion, bending and shear.Hence, by observing the existing literatures, this work is carried out with different percentages of fibers with the inclusion of admixtures to form binary blended concrete to study the behavior of specimen subjected to combined torsion, bending and shear and to achieve the optimum fiber percentage for Binary Blended Fiber Reinforced Concrete Beams.
2024 •
New Perspectives in Science Education Conference Proceedings
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Celedonio Castanedo. Seis enfoques psicoterapeuticos2008 •
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Corespondenţa primei perechi regale a României, Carol I şi Elisabeta, păstrată la Arhivele Naţionale ale României din Bucureşti2018 •
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