Influence of steel fiber shapes on fresh and hardened properties of steel fiber reinforcement self-compacting concrete (SFRSCC)

Concrete material has low tensile strength and brittle characteristics. The solution to overcome this weakness is using ductile materials such as steel fibers. The use of steel fibers has constraints in workability. To facilitate work in the field, it was developed to become self-compacting concrete (SCC). SCC which uses additional steel fibers is known as steel fibers reinforced self-compacting concrete (SFRSCC). The development of steel fiber shapes from beginning to the present has produced many types of shapes, including straight, crimped, and hooked. Based on the various shapes of steel fiber, further development of SFRSCC technology needs to be carried out. This paper analyzed the influence of steel fiber types consisting of the three types of shapes on the physical and mechanical properties of SFRSCC. The methodology in this paper is to use a literature review and experimental methods. The results of the analysis show that all types of steel fibers result in a decrease of workability. the most decreased workability contains steel fibers of hooked type, and while the least decreased one used steel fibers of straight type. The results of the mechanical properties analysis showed the opposite, the largest increase in mechanical properties was obtained using hooked type, and straight type. For optimum physical and mechanical properties, crimped type is recommended as a type of steel fiber in the SFRSCC.