Experimental tests of steel fibre reinforced concrete beams under drop-weight impacts
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Concrete is a brittle material, especially under tension. Intensive researches have been reported to add various types of fibres into concrete mix to increase its ductility. Recently, the authors proposed a new type of steel fibre with spiral shape to reinforce concrete material. Laboratory tests on concrete cylinder specimens demonstrated that compared to other fibre types such as the hooked-end, deformed and corrugated fibres the new fibres have larger displacement capacity and provide better bonding with the concrete. This study performs drop-weight impact tests to investigate the behaviour of concrete beams reinforced by different types of steel fibres. The quasi-static compressive and split tensile tests were also conducted to obtain the static properties of plain concrete and steel fibre reinforced concrete (FRC) materials. The quasi-static tests were carried out using hydraulic testing machine and the impact tests were conducted using an instrumented drop-weight testing system. Plain concrete and concrete reinforced by the commonly used hooked-end steel fibres and the proposed spiral-shaped steel fibres were tested in this study. The volume dosage of 1% fibre was used to prepare all FRC specimens. Repeated drop-weight impacts were applied to the beam specimens until total collapse. A 15.2 kg hard steel was used as the drop-weight impactor. A drop height of 0.5 m was considered in performing the impact tests. The force-displacement relations and the energy absorption capabilities of plain concrete and FRC beams were obtained, compared and discussed. The advantage and effectiveness of the newly proposed spiral-shaped steel fibres in increasing the performance of FRC beam elements under impact loads were examined.
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Experimental investigation of the behaviour of spiral steel fibre reinforced concrete beams subjected to drop-weight impact loadsHao, Y.; Hao, Hong; Chen, G. (2014)Concrete is a brittle material with much lower strength in tension as compared to that in compression. Adding fibres into concrete mix has been intensively investigated to increase the ductility, the crack control and ...
Li, H.; Chen, Wensu ; Hao, Hong (2019)© 2019 Elsevier Ltd A number of drop weight tests on reinforced concrete (RC) beams have been reported in literature. These tests conducted by different researchers used drop weight of different geometries. Some researchers ...
Hao, Yifei; Hao, Hong (2016)Many studies have demonstrated that adding steel fibers to concrete mixture is able to markedly increase the ductility and tensile strength and thus enhance the resistance of concrete structures against blast and impact ...