Impact resistant behavior of fiber reinforced concrete beam with 400 N/mm2 compressive strength

In this study, in order to investigate impact resistant behavior of steel fiber reinforced Pore Free Concrete (PFC), that is newly developed ultra-high-strength concrete with 400 N/mm2 compressive strength, falling-weight impact loading tests of PFC beam were conducted taking mixing ratio of steel fiber and height of falling-weight as variables. To investigate the effects of compressive strength on impact resistant behavior of concrete beam, the tests using high-strength concrete (HC) with 100 N/mm2 were also conducted. From this experimental study, following results were obtained: 1) Impact resistant capacity of PFC beam can be more drastically improved by mixing 2 vol.% of steel fiber than the case of HC beam; 2) bonding resistance between PFC and steel fiber could play an important role for upgrading the impact resistance