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Fiber Reinforced Concrete
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Fiber-reinforced concrete (FRC) Concrete exhibits brittle behavior, so concrete structures consist of conventional steel reinforcement featuring its deformability in tension stress field. It has possibility to be improved concrete structuresf behaviors, if concrete itself has ductility or deformability. The short fibers which are mixed into fresh concrete make concrete resistible for tensile force. Polymeric fibers such as PVA, PE, Aramid and PP make focus on its high strength, lightweight and non-corrosion. |
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Test method At present time, there is no unified standard to evaluate the effect of short fibers to improve the concrete ductility. The fracture energy can be obtained by loading test of notched beam specimens. |
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Load - CMOD curve The load vs. CMOD (crack mouth opening displacement) curves are changed not to show the remarkable drop of load by mixing fibers. There is the case that the applied load increases after first cracking. These phenomena are provided by bridging effect of the fiber. The bridging effect varies by the types of fibers, dimensions, and so on. |
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Fracture energy The relationship between CMOD and fracture energy shows that the fracture energy increases as the decrement of load becomes smaller. The fracture energy of fiber-reinforced concrete gives 10 - 50 times that of normal concrete. |
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