Impact performance of environmentally friendly fiber reinforced concrete under repeating impact

Nowadays, the need to move towards sustainable development emphasizes the need to investigate the behavior of environmentally friendly concrete. So far, several studies have investigated the mechanical properties of this type of concrete, but their impact properties have rarely been investigated. In this research, impact performance of environmentally friendly fiber reinforced concrete was investigated under drop weight impact, according to the method proposed by ACI C544. In order to achieve environmentally friendly concrete, natural aggregates (NA) was replaced by recycled concrete aggregate (RCA) with amounts of 0, 50, and 100%, and ordinary Portland cement (OPC) was replaced by ground granulated blast furnace slag (GGBFS) with amounts of 0, 15, and 30%. Moreover, specimens made in this study were reinforced by 0, 0.5, and 1% hooked-end steel fibers. The results of this test include the number of impacts to create the first visible crack, the number of impacts to create ultimate destruction, and impact energy absorption. The results of investigations showed a 20.1% and 3.6% reduction in ultimate impact resistance due to the use of 100% RCA and 30% GGBFS, respectively, while the addition of 1% steel fibers increased this parameter by 8 times. Finally, statistical analysis on the results of impact tests showed that two-parameter Weibull distribution is a suitable statistical distribution for the statistical investigation of the impact resistance of concrete containing RCA and GGBFS.