Abstract:
In order to increase the concrete properties, i.e. toughness and energy absorption, the corresponding fiber is an appropriate material utilized for mixing concrete. The drop-weight test methodology is applied to determine the impact energy at first crack and ultimate failure, number of blows in a repeated impact and character of crack as well as the damage observed after testing. This method is to verify the behavior and impact resistance of concrete.
The variable rate of hook end steel fiber is stipulated. The mixing ratio of the corresponding fiber is 0.5, 0.75 and 1% by volume of concrete, concrete beam specimens with a dimension of 10 x 10 x 50 cm were cast. Drop-weight test is used in this study and the instruments for impact tests have been developed. The equipment for the drop-weight impact test consists of 4.54 and 9.09 kg hammer drop high at 45.7 cm. The hammer was dropped repeatedly and the number of blows required to produce the first visible crack in the specimen and for ultimate failure were recorded. The deflection from impact load (Δ) was measured and the deflection resulting from static load was calculated.
The results show that the compressive stress, splitting and bending is higher than normal concrete. Impact test of number of blows in a repeated, steel fiber reinforced concrete (SFRC) is 9 times higher than normal concrete. Impact energy at first crack and ultimate failure SFRC is greater than the normal concrete. The deflection from impact load (Δ) and deflection resulting from static load of SFRC are decreased.