FIBRE CONCRETE 2013 September 12–13, 2013, Prague, Czech Republic _________________________________________________________________________ 1 THREE POINT BENDING AND UNI-AXIAL TENSION TESTS OF DOUBLE HOOK-END FIBERS REMPLING Rasmus 1 , FALL David , LUNDGREN Karin Abstract This paper presents experimental results from tree point bending and uni-axial tension tests of fiber reinforced concrete, using steel fibers with a moderate fibre content (Vf = 0.3 %) of double hook-end steel fibres. The three-point bending tests included six notched fiber reinforced concrete (150mm*150mm*550mm) and six non-reinforced concrete beams and the uni-axial tension tests included six fiber reinforced- and six non-reinforced notched concrete cylinders that were core-drilled, 100mm, from rectangular specimens, >1000mm, and cut to 100mm lengths. The results from the beam tests show a separation of response into two groups of three beams with regard to the energy absorption capacity. Three beams showed relative low and three beams showed high capacity in comparison with other types of fibers. The results from the uni-axial tension tests showed a similar behaviour, but with a smaller scatter. Keywords: three point bending test, uni-axial tension test, fibre reinforced concrete, double hook-end fibre 1. Introduction Extensive research has proven that steel fibre reinforcement provides significant post-crack ductility to the otherwise brittle concrete. This effect have been quantified in numerous studies [1, 2] and later also standards for assessment of the characteristic material parameters, e.g. fracture energy [3, 4]. Approximately a decade ago the Rilem technical committee 162-TDF, “Test and design methods for steel fibre-reinforced concrete”, published recommendations for two test methods: uni-axial tension test (UTT) and a three point bending test (3PBT) that can be used for assessing material parameters, see [3, 4]. In 2006, researchers from Gothenburg investigated these methods and compared them with an alternative method: the wedge-splitting test method. The investigation found that the scatter in the test results of all three tests was rather large due to variations in fibre distribution and orientation; and concluded that it is always necessary to count and explicitly state the number of fibres crossing the fracture plane, see [5]. 1 Rempling, Rasmus, Chalmers University of Technology, Civil and Environmental Engineering, Structural Engineering, Sven Hultins Gata 8, 412 96 Gothenburg, rasmus.rempling@chalmers.se