Characteristic Evaluation of UHPC Flexural Behavior with Mixed-Use Hooked and Straight Type Fiber
This study, in order to identify the effects that the mixed-use of long and short fiber has on the mechanical characteristics of UHPC, we used a steel fiber of 65, 82 and 98 in a shape ratio (l/d) alternating from the length of 13, 16,3 and 19.5 mm respectively in the short fiber with a diameter of 0.2 mm and used the hooked-type high-elasticity steel fiber with a diameter of 0.375 and the length of 30 mm of the long fiber. As a result, it was found that, in constructability and compressive behavior in the same fiber mixing ratio, the more the mixed amount of short fiber, the higher the compressive strength, but it was analyzed that the increase of width was very narrow. According to the results from the review on the flexural tensile behavior of UHPC to make a hybrid from the straight-short and hooked-long fiber, it was analyzed that the use of hybrid fiber does not significantly contribute to the enhancement of the flexural strength of UHPC, however, it greatly contributes to the enhancement of the flexural toughness. In the case of using the fiber in this method, it was analyzed that it would be possible to manufacture UHPC which is superior in workability and mechanical characteristics and economically feasible.
Qing Yang, Li Hua Zhu, Jing Jing He, Zeng Feng Yan and Rui Ren
G. S. Ryu et al., "Characteristic Evaluation of UHPC Flexural Behavior with Mixed-Use Hooked and Straight Type Fiber", Advanced Materials Research, Vols. 368-373, pp. 258-264, 2012