Experimental study, modeling, and reliability analysis of impact resistance of micro steel fiber‐reinforced concrete modified with nano silica
Sadi Ibrahim Haruna, Han Zhu, Han Zhu, Jianwen Shao
Abstract
Abstract This paper presents the experimental, statistical modeling, and reliability analysis of impact resistance of micro steel fiber reinforced concrete (FRC) incorporated with nano silica (NS) using a drop‐weight impact test. U‐shaped concrete specimens were developed for the experimental work. The result showed that the combined effect of micro steel fiber (SF) and NS led to significant improvement of impact resistance of concrete mixtures, and lower ductility ratios were obtained for specimens with high SF and NS content. A common failure pattern was observed for all the concrete specimens. The response surface methodology models developed to predict the impact resistance of FRC‐NS mixtures showed a high degree of correlation. Due to the variation in the drop‐weight impact test' result, the Weibull distribution (WD) function was employed for advance analysis, and the result revealed that the probabilistic distribution of first crack strength ( N 1 ) and failure strength ( N 2 ) follows the two‐parameter WD.