Steel Fiber Reinforced Concrete (SFRC) is a type of multiple reinforcement. It compensates the brittleness of concrete by implanting small fibers in it uniformly and dramatically improves it in tensile strength, flexural strength, shock strength, and stickiness.
This research studies the properties of strength and shock strength in different proportion of fibers mixed into concrete, using steel fibers with a high coefficient of elasticity. The evaluation system for shock strength of SFRC has not been established yet. We measure shock load for SFRC with a hammer-dropping test and study shock strength of SFRC with size of cracks and a static bending test. In addition, using a bending test, we measure how much load the concretes which have not been broken in a hammer-dropping test can standby remaining bending strength and regard it as an indicator of shock strength.
A serious defect in concrete is that it is brittle and cracks often occur on its surface. In order to improve the defect, it is considered effective to use multiple reinforcement, since it is difficult to improve concrete itself.
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