EXPERIMENTAL INVESTIGATION OF BOND STRENGTH IN STEEL FIBER REINFORCED CONCRETE

Civil Engineering

Reinforced concrete is most successful material used in the construction industry. Also used in worldwide. Utility of reinforced concrete as structural material is derived from composite action of takes place between reinforcing bars and concrete at their interface known as bond. In recent years SFRC is widely used in the construction industry as it can improve durability of structural member if correctly mixed and casted. The properties of steel fiber such as aspect ratio, diameter of fiber etc. influences properties of concrete. Many researchers have found that steel fibers when added to the concrete in specific proportions increases its compressive strength and arrest concrete cracks. Many researcher effect of steel fiber on bond slip behavior of fiber reinforced concrete is not entirely implicit. There are insufficient guidelines for bond behavior of reinforcing steel bars to fiber reinforced concrete and this one of the reason limiting their use in the practice. The proposed work bond strength of steel fiber reinforced concrete is investigated for concrete mixes M30 and M40 with 0%,0.5%,1.0%,and 1.5% steel fibers in concrete and reinforcing bar of diameter 12 mm. hooked end steel fibers with aspect ratio 50 are used in the experimental investigation. A series of 24 cubes and 40 pullout specimens are casted and tested for compressive test and bond strength respectively. The result shows that for concrete mix compressive strength of concrete increases with the increase in the content of steel fibers in the concrete. Also it is observed that for a grade of concrete bond strength decreases with the increase in steel fibers percentage in concrete. Almost all the pullout specimens failed in splitting mode.

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