Resistibility Against Impact Load and Deformation Characteristics Under Bending Load in Polymer and Hybrid (Polymer and Steel) Fiber Reinforced Concrete
S. Hasaba, M. Kawamura,
T. Koizumi, and K. Takemoto
Appears on pages(s):
bending; fiber reinforced concretes; flexural strength;
impact strength; impact tests; load-deflection curve; metal
fibers; polypropylene fibers.
This paper reports a few results of the experiments carried out in order to investigate the characteristics of deflection of the polymer fiber and the hybrid fiber reinforced concrete beams under bending load. Some results on the dynamic strength test for the polymer and hybrid fiber reinforced concrete beams by a Charpy impact tester modified for concrete specimens are also refered in this paper. The polymer fibers used in polymer fiber reinforced concrete are generally filaments with extremely small diameter. The fibers used in this study are relatively thick with the rectangular cross section of 2 by 0.6 mm. From these experiment, it may be found that the flexural strength of concrete is improved by the addition of the polymer fibers. The polymer fiber reinforced concrete beams showed great endurance after the initiation of cracks in the specimens. A method by a modified Charpy impact tester was proposed in this study for evaluating the resistance of concrete against impact load. According to the results obtained using this method, the resistibility of the polymer and the hybrid fiber reinforced concrete against impact load is about double that for fiber-free concrete.