Experimental Study on Bending Performance of Hybrid Fiber Reinforced Cementitious Composite
ZHANG Lei1,†, JIANG Chao2,†, ZHU Xuejun2, XIE Qun1,*, LIU Wensheng2, ZHAO Zhenzhen2, ZHENG Yuanwu2, LI YANG2
1 School of Civil Engineering and Architecture, University of Jinan, Jinan 250022, China 2 China Construction Fifth Engineering Division Corp, Jinan 250101, China
Abstract: Hybrid fiber reinforced cementitious composite (HFRCC) was prepared by addition polyethylene (PE) fiber and steel fiber in cement matrix in which the content of PE fiber was a constant of 1%. The flexural properties of HFRCC with different steel fiber size and content were experimentally investigated. The results showed that the incorporation of steel fiber will lead to a transition of failure modes at ultimate state from multi-crack to critical crack, and the critical-crack failure characteristics is more obvious with the increase of steel fiber content. The existence of hybrid fiber will enhance the cracking deflection, flexural strength, and toughness index of HFRCC, however, it will reduce the cracking stress and peak deflection. The flexural strength of HFRCC rises with the increase of steel fiber content and the maximum strength, and it can reach up to the max value of 15.40 MPa, 26.5% higher than that of cementitious material only with PE fiber. The proposed nonlinear regression model for flexural strength prediction has a satisfactory accuracy based on the comparison with experiment data.
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