Self Compacting Concrete Using Steel Fibre Research Papers (original) (raw)

Earthquakes of the past have proved beyond doubt that the loss of life and property can be minimized if the structures are designed and detailed to behave in a ductile manner. The secrete of improving the ductility factor of reinforced concrete frames lies in the increased rotational capacity of the cross sections, especially at the joint where the complex state of stress exist.
Previous research have attempted to improve the joint performance by either including fibrous concrete at the joints to improve the tensile strength of concrete or by using Self Compacting Concrete(SCC) for properly compacted concrete at the joints. However, these strategies were only individually quantified. In this work two different methodologies, namely, adopting fibrous conventional concrete in joint and fibrous SCC at joints are evaluated for their influence on the full range behavior of square RC one fourth scale frames subject to static cyclic loading.
Totally four number of specimens first one with conventional concrete for monotonic loading test, the second with conventional concrete with cyclic loading, the third one with fibrous concrete at joint subjected to cyclic loading and fourth one of SCC with Fibre subjected to cyclic loading are taken up. M40 grade of concrete is used. The behavioral parameters compared are initial stiffness, degradation of stiffness, first crack load, energy absorption, ductility factor and failure pattern of frames.
The experimental results of the monotonic tests are compared with linear and non-linear finite element analysis results using standard structural analysis software and using plastic analysis procedure. The investigation indicated that the frames with fibres added to SCC at hinges indicated relatively better performance under cyclic loading and hence is recommended for improving seismic performance of RC frames.

Steel filaments comprises of hard drawn carbon steel wire that has been cut into reasonable lengths for use as necessary support in concrete and shotcrete blends. The fiber includes the high viewpoint proportion (length to width proportion) needed to limit the amount of fiber to be added to a solid or shotcrete blend to get the necessary actual properties. Steel filaments are snared at each finish to give improved mechanical harbour of the fiber inside concrete or shotcrete. This gives improved effect opposition, adaptable strength and post-breaking strength comparative with straight filaments. To stay away from issues of lopsided scattering or balling of fiber in concrete and wet interaction shotcrete blends, filaments are followed together in clasps of up 30 wires every, when these clasps enter the blend, the glue is disintegrated and singular strands are conveyed equitably through the blend. Given suggested blending methodology and times are streamed, the dispressed filaments won’t tangle or ball together in the appropriately planned and created concrete or shotcrete blends.

The construction of modern structures alarming the attention of use of materials with improved properties in respect of strength, stiffness, toughness and durability. Concrete is one of the most widely used construction material having several advantages such as high strength, good mould ability and high durability. The major disadvantages of concrete are its poorer tensile strength and lesser ductility (toughness). Conventional concrete used in building construction and engineering applications requires compaction to attain strength, durability and homogeneity. The typical method of compaction, by vibration, generates delays and additional costs in projects and could pose a serious health hazard due to noise pollution in and around construction sites. Self Compacting Concrete (SCC) is a concrete which is highly flowble, can flows readily into place, fill the formwork without any compaction and without undergoing any significant segregation. Recycling is the act of processing the used material for creating a new useful product. Construction and Demolished waste also generate Recycled Aggregate (RA). Such a Recycled Aggregate proved to be a reliable alternative to Natural Aggregates (NA) in concrete. There is a growing need for renovation from a usual consumption based society to a sustainable society owing the natural environment pollution, exhaustion of natural resources and as decreasing capacity of disposal facilities for final waste. Use of aggregates from Building Demolished Waste (BDW) in structural concrete is definitely an important stride. Use of RA in developing SCC is certainly a novel thought towards achieving a sustainable concrete. There is a pressing demand for the use of Recycled Aggregate in recent concretes, as sustainability is given the highest importance in today’s world. This has necessitated the make use of Recycled Aggregates in SCC and fibre based SCC. Hence Reinforced Self Compacting Concrete using Recycled Aggregate with fibres may be a potential material in construction. In order to clearly understand the performance of such a concrete, there is a call for to study the stress-strain and flexural strength behaviour. The present study focuses on flexural bond strength behaviour of Fibre Reinforced Self Compacting Concrete by replacing the natural Aggregate with Recycled Aggregate. BDW is used as coarse aggregate in the concrete, with an aim to achieve sustainable concrete.

Strengthening of RC beams and slabs using fiber-reinforced polymers (FRPs) is known to control crack width. However, no specific provisions are provided by most international design codes for predicting crack width in FRP-strengthened members. In this paper, models for predicting crack width of conventional RC members in five international codes are extended to FRP-strengthened beams by introducing appropriate modifications to account for the effect of FRP composites. Predictions of the crack width by the resulting models are evaluated and compared with experimental results. Both analytical and experimental results showed significant reductions in crack widths due to FRP strengthening. The efficiency of controlling crack width, however, decreased with increased amount of steel reinforcement and increased with increasing the ratio of FRP plate to beam width. Comparison of the codes' predictions of the maximum crack width against experimental results revealed that some predictions are in good agreement with the measured values while others overestimate the maximum crack width by a significant margin.

Steel fiber reinforced self-compacting concrete (SFRSCC) is a relatively new composite material which congregates the benefits of self-compacting concrete (SCC) technology with the profits derived from the fiber addition to a brittle cementitious matrix. The crack propagation can be reduced by addition of steel fibres in concrete. Addition of fibres reduces workability of concrete which is the major drawback. SFRSCC is a trending concrete where the required workability is obtained by addition of chemical admixtures such as Super plasticizer (SP) and Viscosity Modifying Agent (VMA). In the present work, an effort is made to make a comparative study of stress-strain behavior of M30 grade steel fiber Reinforced Self-Compacting Concrete (SFRSCC). Complete Stress – Strain behavior has been presented and an empirical equation based on mathematical model is proposed to predict the stress – strain behavior of such concrete under compression. The proposed mathematical equation shows good correlation with the experimental results. There is an improvement in the Axial Compressive Strength of SCC which could be due to the addition of the steel fibers

- by GJESR Journal and +2
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- Self Compacting Concrete, Super Plasticizer, Steel Fibre, Self Compacting Concrete Using Steel Fibre

The objective of the present work is to evaluate the influence of two different methods of improving the ductility of Reinforced Concrete Frames and their influence on the full range behavior of the frames with M40 grade of concrete. For this purpose one fourth scale reinforced concrete square frames are experimentally tested subjected to static cyclic loading for three cases and monotonic loading for one case. The parameters are varied as method introducing ductility to the frame viz. (i) by using conventional concrete (ii) adding 1% of steel fibres by volume of concrete at hinging zones (iii) using self-compacting concrete with fibres at hinging zones. The behavior of frames tested under cyclic loading have revealed that there is a positive trend in improvement of ductility of frames when fibreous concrete is used along with self-compacting concrete.

- by kasilingam Senthil and +1
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- Plastic Hinge, Concrete Cyclic Loading, Self Compacting Concrete Using Steel Fibre

Self‐compacting concrete (SCC) was developed in 1988 and introduced by Professor H. Okamura to achieve durability of structures with low skilled laborers. The three properties of SCC that differentiates it from traditional concrete are passing ability, filling ability and segregation resistance. The present study highlights the developments concerning SCC in the period from 1995 to 2017. This information is important for researchers and professionals working in this area. SCC can be optimized to a larger extent to find the best alternative either by use of additives or tailor‐made mix design. Based on different principles and parameters, design methods can be categorized into six classes namely empirical design method, statistical factorial design method, strength‐based design method, rheology of paste method, particle packing method and Eco‐SCC mixture design method. To develop SCC with high quality a suitable method can be chosen depending upon the situation and application.

The full range behavior ductile and non-ductile frames have been evaluated under monotonic and cyclic loading. The one fourth scale Reinforced Concrete square frames are experimentally tested subjected to static cyclic loading for three cases and monotonic loading for one case. The parameters are varied as method introducing ductility to the frame by using conventional concrete, adding 1% of steel fibres by volume of concrete at hinging zones and self-compacting concrete with fibres at hinging zones. The results compared with respect to initial stiffness, degradation of stiffness, first cracking load, ultimate loads, degradation of load carrying capacity, energy absorption and ductility factors characteristics. The behavior of frames tested under cyclic loading have revealed that there is a positive trend in improvement of ductility of frames when fibrous concrete is used along with self-compacting concrete. Also, the behavior of conventional reinforced concrete frame against monotonic loading has been studied numerically using commercial finite element tool ABAQUS/Standard and compared with the experiments are found in good agreement.

The self-compacting concrete (SCC) is the newest innovating category of high performance concrete. The shear behavior of Fiber Reinforced Self-Compacted Concrete (FRSCC) deep beams was investigated. The experimental program consisted of twelve simply supported beams tested up to failure under four-point load. The key parameters covered in this investigation were steel fibers ratios (0.0, 0.50, 0.75 & 1.00%) and the effective shear span to depth ratio; a/d that varied from 0.6 to 1.0. Also, the main flexure reinforcement ratio was variable (1.0, 1.60 and 2.20 percent). In addition, vertical and horizontal web reinforcement effect was investigated. The mid-span deflection, cracks, reinforcement and concrete strains of the tested beams were recorded and compared. Test results pointed out that the steel fibers enhanced the cracking load, ultimate capacity, displacement and energy absorption of the tested FRSCC deep beams. The utmost enhancement in the performance of deep beams was achieved with steel fibers content of 1.0% within the range of the test parameters. The enhancement in the ultimate capacity was 40%. The test results indicated that both vertical and horizontal web reinforcement are efficient in shear capacity enhancement of FRSCC deep beams. The ultimate shear capacity was increased by about 47% with increasing the longitudinal steel ratio from 1.0% to 2.2%. Maximum strain in the extreme compression fiber of concrete section was 0.0019 and achieved at specimen tested at a/d ratio of 0.6. A non-linear finite element analysis (NLFEA) model was constructed to simulate the shear behavior of tested beams, in terms of crack pattern and load deflection behavior. It can be concluded that a good agreement between the experimental and numerical results was achieved. The ratio of the predicted to the experimental ultimate strength ranged between 0.98 and 1.04.

- by Mohamed S Mohamed and +2
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- Ansys, Reinforced concrete, Non-linear Finite Element Method, Deep Beam

The objective of the present work is to evaluate the influence of two different methods of improving the ductility of Reinforced Concrete Frames and their influence on the full range behavior of the frames with M40 grade of concrete. For this purpose one fourth scale reinforced concrete square frames are experimentally tested subjected to static cyclic loading for three cases and monotonic loading for one case. The parameters are varied as method introducing ductility to the frame viz. (i) by using conventional concrete (ii) adding 1% of steel fibres by volume of concrete at hinging zones (iii) using self-compacting concrete with fibres at hinging zones. The energy absorption by ductile and non-ductile frames has been compared. The behavior of frames tested under cyclic loading have revealed that there is a positive trend in improvement of ductility of frames when fibrous concrete is used along with self-compacting concrete.