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In this study, the mechanical properties and fracture energy of high strength fibre reinforced concrete (HSFRC) have been investigated. For this purpose, eight mix compositions have been made in two water-to-binder ( W / B ) ratios of 0.32 and 0.37. The quantity of coarse and fine aggregates in the two  W / B  ratios were not the same. The polyolefin macro-fibres were used at three different fibre volume fractions of 0.2, 0.4 and 0.6%. The compressive strength, flexural strength, fracture energy, capillary water absorption, electrical resistivity and ultrasonic pulse velocity tests of concrete mixes were studied. The results showed that polyolefin macro-fibres had negligible effect on the compressive strength. However, the use of polyolefin macro-fibres improved the flexural strength of high-strength concrete. The highest improvement of flexural strength was obtained in the volume fraction of 0.4% at the  W / B  ratio of 0.32, which improved by 22.1% in comparison to the control mix. Moreover, the fracture energy of high-strength concrete highly depended on the amount of macro-fibres. For instance, the use of 0.2, 0.4 and 0.6% macro-fibres has led to the improvement of fracture energy by 133, 228 and 190% for mixes with  W / B  ratio of 0.32, respectively. Furthermore, by increasing the amount of fibres, the capillary water absorption coefficient of concrete enhanced; therefore, its water penetration increased.

The fracture energy and mechanical properties of high-strength concrete containing polyolefin macro-fibres