Steel fibers have been used worldwide to enhance properties of concrete but have not yet gained popularity in Pakistan. An experimental study was conducted to study the mechanical properties of steel fiber reinforced concrete that would lead to recommendation for possible use in Pakistan. Steel fibers conforming to recommendations of ACI Committee 544 were used with cement, sand and silica fume to cast samples for testing. Coarse aggregates were not used in order to compare the properties with famous Ultra High Performance ductile Concrete (UHPdC). Three different mixes were made with 2.5%, 5% and 8% of steel fibers by total weight of batch mix. Water cement ratio was kept as low as 0.25 to obtain high strength. Super plasticizer was added to increase workability. Reduction in flowability of concrete was observed with increasing percentage of fibers. Compressive, splitting tensile and flexural strengths were defined by testing standard cylinders and beams made up of different mixes of SFRC. Highest compressive, splitting tensile and flexural strengths were observed for steel fiber content of 8% followed by 5% and then 2.5% fiber contents as expected. Achieved compressive, splitting tensile and flexural strengths were much higher than the conventional concrete strengths used in Pakistan. Results of the study indicate that SFRC has the potential to be used in Pakistan in structures where high strength and is desired. Durability aspects of SFRC have to be looked into before it can be used in structures exposed to aggressive environments or located in coastal areas.
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