IMPACT RESISTANCE AND STRENGTH RELIABILITY OF FIBER REINFORCED CONCRETE USING TWO PARAMETER WEIBULL DISTRIBUTION

In this study, an attempt has been made to investigate the impact resistance of fiber reinforced concrete (FRC), subjected to drop weight test in accordance with the procedure suggested by ACI committee 544. For this, four samples were prepared from each series of mix containing crimped and hooked end steel fibers of 1 mm diameter and 50 mm length in various proportions viz., 0%, 0.5%, 1.0% and 1.5%, with a water cement ratio of 0.42. In the view of variations of test results, two parameter weibull distributions were performed to analyze the experimental data and the impact failure strength was presented in terms of reliability function. The results indicated that incorporating steel fiber to concrete increased the impact resistance and changed the failure pattern from brittle to ductile mode. Also, results indicated that the weibull distribution allows the researchers to describe the impact failure strength of FRC in terms of reliability and safety limits. This provides a greater ease for designers by eliminating the number of experiments.