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Comparative experimental study on flexural properties of high strength concrete   fiber reinforced concrete and high strength concrete beams

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Document pages: 13 pages

Abstract: In this study, the flexural responses of high strength fiber reinforced concrete (hsfrc) beams and high strength concrete (HSC) beams are compared. A series of high strength steel fiber reinforced concrete and high strength concrete beams were tested under pure bending load. The effects of concrete type, concrete compressive strength and tensile reinforcement ratio on the flexural performance of concrete beams are studied. The flexural properties of hsfrc and HSC beams are compared, including induced crack and failure mode, load and deflection capacity, crack stiffness, ductility index and flexural toughness. The crack stiffness of high-strength concrete and high-strength FRC beams increases with the increase of reinforcement ratio. Under the same reinforcement ratio, the crack stiffness of high-strength concrete beam is much greater than that of high-strength concrete beam. Ductility index of concrete HSC beams decreased sharply with an increase in the rebar ratio, but the ductility index of the HSFRC beams did not show a clear decrease with increasing rebar ratio. The flexural toughness of the HSFRC beams was greater than that of the HSC beams at higher rebar ratios of 1.47 and 1.97 , indicating that the energy absorption of the HSFRC beams was greater than that of the HSC beams. Test results also indicated that HSFRC developed better and more consistent ductility with higher rebar ratio. In addition, the tested bending strength and sectional analysis results were compared.

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