Flexural performance of ultra-high performance fiber reinforced cementitious composite material doped with copolymer formaldehyde fiber

被引：0
|
作者：
Wang C. [1 ]
Zhang Y. [1 ]
Duan L. [1 ]
机构：
[1] School of Highway, Chang'an University, Xi'an
来源：
Fuhe Cailiao Xuebao/Acta Materiae Compositae Sinica | 2024年 / 41卷 / 01期
关键词：
copolymer formaldehyde fiber; fiber content; fiber type; flexural performance; ultra-high performance fiber reinforced cementitious composite material;
D O I：
10.13801/j.cnki.fhclxb.20230524.003
中图分类号：
学科分类号：
摘要：
In order to investigate the flexural performance of ultra-high performance fiber reinforced cementitious composite material (UHPFRC) doped with copolymer formaldehyde fiber, five groups of bending specimens were designed and tested, including three groups of single mixed specimens and two groups of fiber hybrid specimens. The results show that among the copolymer formaldehyde fiber UHPFRC specimens, 2vol% copolymer formaldehyde fiber UHPFRC specimens have better flexural strength, with an average strength of 13.4 MPa. An appropriate amount of co-formaldehyde fiber can delay the cracking of UHPFRC matrix and enhance its ability to deformation before cracking. Among the five groups of test pieces, the cracking deflection of 2vol% copolymer formaldehyde fiber UHPFRC test piece is the largest, which can reach 0.65 mm. Hybrid fiber can better enhance the flexural strength and toughness of UHPFRC. When 1.5vol% copolymer formaldehyde fiber and 1.5vol% steel fiber are mixed, the flexural strength of UHPFRC specimens can reach 13.9 MPa, and the toughness of this group of specimens is the best. The research reveals the effect of copolymer formaldehyde fiber on the flexural mechanical properties of UHPFRC, which has important reference value for its application in UHPFRC and the promotion of UHPFRC. © 2024 Beijing University of Aeronautics and Astronautics (BUAA). All rights reserved.
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页码：373 / 382
页数：9
相关论文
共 27 条
  • [11] LYU Jinfei, Study on properties of POM fiber reinforced concrete, (2019)
  • [12] HE Yuexiao, HUANG Weirong, GUO Jiangchuan, Et al., Residual mechanical properties of ultra-high performance concrete doped with copolymer formaldehyde fiber exposed to high temperature, Journal of the Chinese Ceramic Society, 50, 3, pp. 839-848, (2022)
  • [13] UHPFRC− Material, design and construction: SIA 2052, (2016)
  • [14] Concrete− Ultrahigh-performance fibre-reinforced concrete− Specifications, performance, production and conformity: NF P18-470, (2016)
  • [15] HE W, WANG C, WANG S, Et al., Characterizing and predicting the tensile mechanical behavior and failure mechanisms of notched FMLs− Combined with DIC and numerical techniques[J], Composite Structures, 254, (2020)
  • [16] FAYYAD T M, LEES J M., Application of digital image correlation to reinforced concrete fracture, Procedia Materials Science, 3, pp. 1585-1590, (2014)
  • [17] LIANG Xingwen, HU Aoxiang, YU Jing, Et al., Effect of steel fibers on the flexural response of ultra-high performance concrete, Acta Materiae Compositae Sinica, 35, 3, pp. 722-731, (2018)
  • [18] Standard for performance test methods of ordinary concrete mixtures: GB/T 50080− 2016, (2016)
  • [19] ZHOU P, FENG P., Unified analysis for tailorable multiscale fiber reinforced cementitious composites in tension[J], Composites Part B: Engineering, 254, (2023)
  • [20] GUO Wenjing, MA Shaopeng, KANG Yongjun, Et al., Virtual extensometer based on digital speckle correlation method and its application to deformation field evolution of rock specimen[J], Rock and Soil Mechanics, 32, 10, pp. 3196-3200, (2011)
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