Fracture energy of ultra-high-performance fiber-reinforced concrete at high strain rates

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• 作者：Ngoc Thanh Tran^a ; Tuan Kiet Tran^b ; Joong Kyu Jeon^c ; Jun Kil Park^a ; Dong Joo Kim^a ; ^{djkim75@sejong.ac.kr" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Fracture toughness (C) ; Strain effect (C) ; Tensile properties (C) ; Fiber reinforcement (E) ; Composites (E)
• 刊名：Cement and Concrete Research
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：79
• 期：Complete
• 页码：169-184
• 全文大小：2319 K

文摘

The fracture energy of ultra-high-performance fiber-reinforced concrete (UHPFRC) at high strain rates (5–92 s^− 1) was investigated, and specimens with 1–1.5% fibers exhibited very high fracture energy (28–71 kJ/m²). Evaluation of the rate effects on the UHPFRC fracture resistance, including fracture strength (f_t), specific work-of-fracture (W_S), and softening fracture energy (W_F), indicated that f_t and W_S were highly sensitive to strain rate, whereas W_F was not. The effects of fiber type, volume content, specimen shape and fiber blending on the fracture resistance at high and static strain rates differed significantly: 1) smooth fibers exhibited higher f_t and W_S at high rates than twisted fibers; 2) higher fiber volume content did not clearly generate higher W_S and W_F at high rates; 3) notched specimens generally exhibited higher fracture resistance than un-notched samples at both static and high rates; and 4) UHPFRC blending two fibers produced higher W_S and W_F than UHPFRC with mono fiber at high rates.