EXPERIMENTAL INVESTIGATION ON HIGH STRENGTH CONCRETE WITH THE ADDITION OF STEEL FIBER

The aim of this study is to investigate the change in mechanical properties of concrete with the addition of steel fiberin high strength concrete. Steel Fibers in Concrete can improve: Crack, Impact and Fatigue Resistance, Shrinkage Reduction, Toughness- by preventing/delaying crack propogation from micro-cracks to macro-cracks. SFRC has been used extensively in construction of industrial floors, bridge deck overlays, airport runways, highway pavements, tunnel linings, spillways, dams, slope stabilizations, and many precast products. An example of recent use of steel fiber is the Gotthard Base Tunnel. Nevertheless, relatively little use of SFRC in the building structure is mainly due to the lack of design provisions in building codes. Steel fibers can improve the characteristics of hardened concrete, and polypropylene fibers can have a significant effects on the fresh concrete. Polypropylene fibers significantly reduce the slump of the fresh concrete resulting in an increase in the adhesion and cohesion of the concrete. Polypropylene fibers also reduce the plastic shrinkage cracks. Polypropylene fibers can increase concrete durability against fire, freezing, and chemical attacks. Due to its benefits, polypropylene fiber reinforced concrete (PPFRC) is used in pile foundations, piers, highways, industrial floors, bridge decking and others. Fibers are mostly used in concrete to control cracking due to various circumstances. Fibers are also helpful in concrete to reduce the permeability which may further Impact the bleeding of water. Some more various types of fibers produces great impact just like abrasion and shatter resistance in concrete. Some recent researches shows that using fibers in concrete shows Impact on the impact resistance of the materials but it is only up to a certain limit.