Mechanical Properties of Hybrid Fiber Reinforced Concrete at Low Fiber Volume Fraction
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Abstract
In the present study concretes containing different types of hybrid fibers at the same volume fraction (0.25%) are compared in terms of mechanical properties. Four types of hybrid composites are constructed using fiber combinations of polypropylene (PP) and carbon, carbon and steel, steel and PP fibers and glass fiber (GF) and steel. Test results showed that the fibers, when used in a hybrid form, could result in superior composite performance compared to their individual fiber-reinforced concretes. Among the four types of hybrids, the carbon–steel combination gives concrete of the highest strength and flexural toughness because of the similar modulus and the synergistic interaction between the two reinforcing fibers.