Park Jung-Jun, Yoo Doo-Yeol, Park Gi-Joon, Kim Sung-Wook
Structural Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology, 283 Daehwa-dong, Goyangdae-ro, Ilsanseo-gu, Goyang-si, Gyeonggi-do 10223, Korea.
Department of Architectural Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Korea.
Materials (Basel). 2017 Jan 28;10(2):118. doi: 10.3390/ma10020118.
In this study, the flexural behavior of ultra-high-performance fiber-reinforced concrete (UHPFRC) is examined as a function of fiber length and volume fraction. Straight steel fiber with three different lengths () of 13, 19.5, and 30 mm and four different volume fractions () of 0.5%, 1.0%, 1.5%, and 2.0% are considered. Test results show that post-cracking flexural properties of UHPFRC, such as flexural strength, deflection capacity, toughness, and cracking behavior, improve with increasing fiber length and volume fraction, while first-cracking properties are not significantly influenced by fiber length and volume fraction. A 0.5 vol % reduction of steel fiber content relative to commercial UHPFRC can be achieved without deterioration of flexural performance by replacing short fibers ( of 13 mm) with longer fibers ( of 19.5 mm and 30 mm).
在本研究中，研究了超高性能纤维增强混凝土（UHPFRC）的弯曲行为与纤维长度和体积分数的关系。考虑了三种不同长度（分别为13、19.5和30毫米）的直钢纤维以及四种不同体积分数（分别为0.5%、1.0%、1.5%和2.0%）。试验结果表明，UHPFRC的开裂后弯曲性能，如弯曲强度、挠曲能力、韧性和开裂行为，随纤维长度和体积分数的增加而改善，而初裂性能不受纤维长度和体积分数的显著影响。通过用较长纤维（19.5毫米和30毫米）替代短纤维（13毫米），相对于商业UHPFRC，钢纤维含量可降低0.5体积%，而不会使弯曲性能恶化。
