Mechanical properties of synthetic fiber reinforced concrete with high fiber volume fraction

This paper presents the results of an experimental investigation on the mechanical properties of synthetic fiber reinforced concrete with fiber volume fraction(Vf)from 0 to 3%.It was found that the compressive strength and elastic modulus decrease with the increase of Vf,the compressive strength is not sensitive to Vf when using macro fiber.The spliting tensile strength,flexural strength and flexural toughness increase with the increase of Vf.The enhancing effect of micro fiber is great in Vf of 1%,but grows slightly in higher Vf.The fascicular fiber shows better enhancing effect in high Vf,it might be applied to improve the mechanical properties of concrete even Vf more than 3%.The enhancing effect of high strength and modulus synthetic fiber on spliting tensile strength and flexural strength of concrete is similiar to steel fibre.