INFLUENCE OF SHORT CUT FIBER ON FRACTURE PARAMETERS OF HIGH STRENGTH CONCRETE : Fracture behavior of high-strength fiber reinforced concrete (HFRC)

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  • KITSUTAKA Yoshinori
    Dept. of Architecture and Building Science, Graduate School of Engineering, Tokyo Metropolitan Univ.
  • OH-OKA Tokunao
    Institute of Technology, Tokyu Construction Co., Ltd.

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  • 高強度コンクリートの破壊パラメータに及ぼす短繊維混入の影響 : 高強度繊維補強コンクリート(HFRC)の破壊性状に関する研究
  • コウ キョウド コンクリート ノ ハカイ パラメータ ニ オヨボス タンセンイ

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Abstract

The influence of short cut fiber on the fracture parameters of high-strength concrete was investigated. Three-point bending tests on pre-notched concrete beam specimen which containing short cut fiber were performed. Fracture parameters of specimen were analyzed based on the poly-linear approximation analysis of tension softening diagram with the data of a load-load point displacement curve. It was found that the toughness of high-strength concrete was significantly improved by mixing short cut fibers in mortar matrix. Material properties and volume contents of fiber were considered to be important factors for improving the toughness of high-strength concrete. Also, the maximum size of coarse aggregate affects the toughness of concrete because the degree of dispersion of fiber in concrete was changed by the distribution of aggregate size.

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