Fiexural Toughness of Cellulose and Hybrid Fiber Reinforced Concrete Beams

The cellulose fiber(ultra-fiber 500) is a new type natural cellulose fiber.In order to study the flexural toughness of cellulose fiber reinforced concrete,the flexural toughness experiments of concrete with synthetic,steel fibers,and hybrid fiber are made at the same time,and the load-deflection curve of all beams are obtained.Based on the ASTM method,the flexural toughness of concrete with cellulose,synthetic,steel fibers and hybrid fibers are all analyzed.The experimental results indicate that the cellulose fiber can improve the flexural toughness and the deformation ability of concrete beams.The flexural toughness index I₅ and I₁₀ of concrete with cellulose fiber are 3.0 and 5.8 times higher than that of the plain concrete respectively.For the same ratio of volume of fibers,the flexural toughness index of cellulose fiber reinforced concrete is higher than that of concrete with PP fiber.Cellulose and steel hybrid fibers can improve the toughness and deformation ability of concrete remarkably,and the failure mode changes from brittle to ductile fracture.