Cement concrete is the most extensively used construction material in the world. The reason for its extensive use is that it provides good workability and can be moulded to any shape. Ordinary cement concrete possesses a very low tensile strength, limited ductility and little resistance to cracking, internal micro cracks, leading to brittle failure of concrete. In this modern age, civil engineering constructions have their own structural and durability requirements, every structure has its own intended purpose and hence to meet this purpose, modification in traditional cement concrete has become mandatory. It has been found that different type of fibers added in specific percentage to concrete improves the mechanical properties, durability and serviceability of the structure. It is now established that one of the important properties of Steel Fiber Reinforced Concrete (SFRC) is its superior resistance to cracking and crack propagation. In this study the effect of Steel fibers on early strength of concrete have been studied by varying the percentage of fibers in concrete. The Chemical admixture used in the concrete is CaCl2 (Accelerator).Fibre content were varied by 0%, 0.50%, 0.75%, 1%, 1.5% and 2% by volume of concrete. Cubes of size 150mmX150mmX150mm to check the compressive strength, Cylinders of size 100mmx200m to check the split tensile strength and beams of size 500mmX100mmX100mm for checking flexural strength were casted. All the specimens were cured for the period of 3, 7 and 28 days before crushing. The results of Steel fiber reinforced concrete on early strength for 3days, 7days and 28days curing with varied percentage of fiber were studied and it has been found that there is significant strength improvement in Early Strength concrete. The optimum fiber content while studying the compressive strength, Split tensile strength and flexural strength is found to be 1.25%. Also, it has been observed that with the increase in fiber content up to the optimum value, the concrete gains maximum compressive strength at 28 days curing while split tensile and flexural performance shows maximum percentage increase in strength in first 3 days of curing. Slump cone test was adopted to measure the workability of concrete. The Slump cone test results revealed that workability gets reduced with the increase in fiber content.
FIBRE REINFORCEMENT, STEEL, COMPRESSIVE STRENGTH, FLEXURAl STRENGTH
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