Effect of fiber type on the mechanical properties and durability of hardened concrete.

This paper studied the effects of basalt fibers (BF), polypropylene fibers (PF), end-hooked steel fibers (HSF), and wavy steel fibers (WSF) on the durability (impermeability and frost resistance) and mechanical properties (compressive, flexural, uniaxial tensile, and splitting tensile strength) of concrete based on the original mix proportion (water-binder ratio of 0.41). The results demonstrate that 0.5% of HSF has the best impact on enhancing concrete's compressive, flexural, and splitting tensile strength, with improvements of 10.88%, 21.02%, and 16.76%, compared to the control group. Meanwhile, 0.2% of BF has the best impact on improving the uniaxial tensile strength of concrete, with an improvement value of 18.91%. For concrete impermeability and frost resistance, 0.1% and 0.2% BF were the optimal fiber and content. However, PF was not very effective in improving the durability and mechanical property of concrete. Considering the scope of the investigated fiber content, the mechanical properties of concrete declined as fiber content rose. Still, the uniaxial and splitting tensile strengths improved as BF content rose. As the content of fiber in concrete increased, its impermeability weakened, and its ability to frost resistance improved. The above conclusions are highly significant for selecting fiber concrete types in future studies. [ABSTRACT FROM AUTHOR]