Experimental Study On Splitting Tensile And Flexural Behavior Of Steel Fiber Reinforced Concrete

In this paper, experimental research on the flexural toughness of steel fiber reinforced concrete (SFRC) is carried out. Fiber content, aspect ratio, fiber pieces/kg and fiber distribution have been considered to analyze the influences of steel fiber on the toughness of normal concrete(fiber content is no more than 40kg/m³). The corresponding mathematical expression has been proposed based on the study on fiber distribution in the cross-sections of SFRC beams.Meanwhile, shear strength, splitting tensile and flexural toughness experiments have been conducted using four types of steel fiber on steel fiber reinforced high strength concrete (SFRHSC).The effects of steel fiber on the splitting tensile and flexural toughness of steel fiber reinforced high strength concrete are quantified based on the definition of equivalent splitting tensile strength, splitting tensile toughness ratio and Japan Society of Civil Engineers (JSCE) approach.Several conclusions are drawn as follows: Compressive strength increased marginally with the fiber content, when the fiber content is no more than 40kg/m³, however, significantly at relatively higher fiber content with the addition of steel fibers on the SFRHSC. Increasing the fiber content can enhance the shear strength. The splitting tensile load-displacement curve acquired from an improved technology can perfectly describe the toughened effect of steel fiber. For all of the equivalent splitting tensile strengths corresponding to different displacement, f_eq0.2 can be used to characterize the ability to inhibit crack propagation of fiber, the full extent of splitting tensile load-displacement curve can be described by f_eq1, and the residual strength can be characterized by f_eq2 .Equivalent splitting tensile strength can reflect the effects of steel fiber in splitting tensile toughness on SFRHSC. The values of toughness ratio referred in this paper would provide some reference for designing of SFRC. Hook ended fiber expresses a striking effect in toughness. An expression of the splitting tensile strength and the flexural strength is regressed based on the experimental data and gains a good linear relativity.