Fiber reinforced concrete is widely used due to its high ductility, energy absorbing capacity, and tensile strength. In this study, the effects of fibers on fresh concrete properties and mechanical properties of self-compacting fiber reinforced concrete (SFRC) were investigated. Basalt fiber (BF), glass fiber (GF), and polypropylene fiber (PPF) were added to the concrete mixtures at the ratios of 0.15, 0.20, 0.25, and 0.30% by volume. The impacts of the content and type of fiber on the fresh SFRC properties (slump-flow diameter, V-funnel flow time, and blocking rate) and mechanical properties such as compressive strength, flexural strength, splitting tensile strength, and toughness index were analyzed. In addition, the microstructure among cement paste and fibers were investigated using scanning electron microscope images. The results show that the adding of fiber to the mixtures significantly improved the flexural and tensile strength, whereas no significant change in compressive strength was observed. In addition, toughness, which is an important parameter for SFRC, was also determined according to ASTM C 1609. None of the BF and GF specimens reached the intended deflection of L/150 (L is the span). A rapid decrease in load was observed after peak load in both fiber types and the samples showed a brittle fracture. On the contrary, the PPF series showed markedly different postcracking behavior than the BF and GF.
In this study, the effects of different fibre types on the workability and mechanical properties of self-compacting concrete were investigated. Fresh and hardened properties of self-compacting concrete, different fibre content 0.90, 1.35 and 1.80 kg/m3 were evaluated using basalt, polypropylene and macro synthetic fibres with different fibre lengths of 24, 19 and 40 mm, respectively. The properties of fresh concrete were evaluated in terms of slump flowing, viscosity and flowability. In addition, compressive, flexural and splitting tensile strength were obtained from hardened concrete properties. To characterize mechanical properties 90 specimens were experimentally tested. The results show that the use of fibre reduces the workability of self-compacting concrete. On the other hand, tensile and flexural strength of the self-compacting fibre reinforced concrete increased with increasing fibre content, but it was determined that the fibre addition had no significant effect on the compressive strength.
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