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The present work deals with the results of experimental investigations on silica fume concrete, steel fiber reinforced concrete. Effect of these fibres on various strengths of concrete are studied. Fiber content varied from say (0.5%, 1.0%, 1.5%, 2.0%, 2.5%, 3.0%, 3.5%, 4.0%, 4.5%, and 5%) by weight of cement.The silica fume is used at constant percentage of 7.5% by weight of cement. Various strengths considered for investigation are compressive strength, flexural strength, split tensile strength for silica fume and steel fibre reinforced concrete.Bond strength is also studied. Cube of size 150 mm for compressive strength, Prisms from flexure tests were used for split tensile strength, beams of size 700 mm x 150 mm x 150 mm for flexural strength were cast. All the specimens were water cured up to 28 days and tested subsequently.The workability is measured with the slump cone test. he density at 28 days is calculated. Ductility of concrete is found to increase in the fibre reinforced concretes as observed from the load deflection study. The Poisson’s ratio is found to vary within the specified limits.The Static and Dynamic Modulus of concrete are studied. Relation between compressive strength and flexural strength are developed. A comparison of results of silica fume concrete fiber reinforced concrete with that of normal concrete showed the significant improvements in the results of various strengths.
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