Investigations on Properties of Concrete using Steel Fiber Reinforced as Partial Replacement of Coarse Aggregate

Scope of using alternate materials as partial replacement of Coarse Aggregate is being searched for Concrete without sacrificing strength or increasing strength from economical & other aspects like; using industrial waste for its efficient use. Investigations were done on M-25grade concrete by replacing coarse aggregate partially by steel fiber to get maximum strength. This Study presents the satisfactory results on various strength tests of concrete containing steel fiber as a partial replacement of coarse aggregate and would help to resolve solid waste disposal problem. However, further research work is still necessary in order to have a more in-depth understanding.


INTRODUCTION
The plain cement concrete has very low tensile strength, restricted pliability, and little protection from breaking. Inward miniaturized scale breaks are innately present in the concrete and its poor rigidity is because of the proliferation of such small cracks, in the long run prompting fragile disappointment of the concrete. The most generally acknowledged solution for this flexural shortcoming of cement is the regular fortification with high quality steel. Regardless of the way that these procedures offer flexibility to people, they however don't grow the trademark unbending nature of solid itself. In like manner the help putting and profitable compaction of RCC is amazingly troublesome if the solid is of low workability especially by virtue of overpowering solid (M-25). In plain concrete and near feeble materials, assistant parts (scaled down scale breaks) become even before stacking, particularly on account of drying shrinkage or distinctive purposes behind volume change. The width of these breaks on occasion outperforms a few microns, yet their two estimations may be of higher enormity.
Whenever stacked, the miniaturized scale airs out proliferate and up, and attributable to the impacts of pressure fixation, extra breaks frame in spots of minor deformities. The auxiliary splits continue gradually. The advancement of such miniaturized micro crack is the primary driver of inelastic twisting in concrete. It has been perceived that the expansion of little, firmly divided and consistently scattered strands to cement would go about as break arrester and would considerably enhance its static and dynamic properties. This sort of cement is known as fibre reinforces concrete

Fiber Reinforced Concrete
Enhancing the tensile properties of plain concrete numerous strategies have been developed. A considerable lot of the strategies prevailing with regards to making the concrete individuals impervious to strain, however none of them expanded the inborn tractable properties of plain concrete. The scattering of strands in concrete network to enhance its ductile properties has been drilled worldwide more than 3 past decades. The expansion of little firmly separated and consistently scattered filaments to cement would go about as break arrester and would considerably enhance its static and dynamic properties. This sort of concrete is known as fibre reinforced concrete. Fibre strengthened concrete can be characterized as a composite material comprising of blends of bond, mortar, or concrete and broken, discrete, consistently scattered appropriate strands. Consistent lattices, woven textures and long wires or poles are not thought to be discrete fibres.

Objectives
The objectives of the research are outlined below:  The aim project is to have a study comparison between mechanical performances of Steel Fiber reinforced concrete.

IJTSRD22861
International Journal of Trend in Scientific Research and Development (IJTSRD) @ www.ijtsrd.com eISSN: 2456-6470 Workability Properties Fresh mix characteristics are more emphasized in fibre concrete compared to the plain concrete, generally increasing weight fraction of fibres results in further reduction of fresh concrete workability. In this study, fibres as steel fibre scraps of different volume fractions like 3 %, 6 %, and 9 % and length of fibre lengths is 25mm to 40 mm.

Mechanical Strength
To evaluate the mechanical strength characteristics of concrete reinforced with steel fibres scraps materials, detailed experimental investigation was carried out and the results are discussed in the forthcoming sections.

Cube Compressive Strength
Totally 108 cube specimens of size 150 mm x150 mm x 150 mm with 3 mixes were casted and tested. Three volume fractions were considered for steel fibre scraps (2.5%, 5% and 7.5% of steel fibres scraps).