Mechanical properties and durability of hydrophobically modified basalt fiber reinforced polymer bars

被引：0
|
作者：
Zhou A. [1 ,2 ]
Li S. [1 ]
Liu T. [1 ,2 ]
Zou D. [1 ,2 ]
Yang G. [1 ]
机构：
[1] School of Civil and Environmental Engineering, Harbin Institute of Technology, Shenzhen
[2] Shenzhen Key Laboratory of Intelligent Structure System in Civil Engineering, Shenzhen
来源：
Fuhe Cailiao Xuebao/Acta Materiae Compositae Sinica | 2022年 / 39卷 / 11期
关键词：
Basalt fiber reinforced polymer; Durability; Hydrophobic modification; Marine environment; Tensile property;
D O I：
10.13801/j.cnki.fhclxb.20220419.003
中图分类号：
学科分类号：
摘要：
Basalt fiber reinforced polymer (BFRP) bars are widely used in marine engineering due to their green nature and corrosion resistance characteristics. However, BFRP bars may swell and crack because of water absorption and alkali corrosion during service, resulting in expansion and damage of resin matrix, and even the debonding between basalt fiber and matrix. Swelled matrix accelerated the invasion of water and corrosive ions, exacerbating the degradation of epoxy matrix. In order to prevent moisture intrusion and extend service life of BFRP bars in marine engineering, a hydrophobic fluorinated nano SiO2 modified epoxy resin was prepared and coated to BFRP bars. The hydrophobic resin can increase the surface contact angle of BFRP from 63° to 106°. Then the original and modified BFRP bars were immersed into in tap water and seawater at 25℃, 45℃ and 60℃ for durability test to explore their variations of water absorption and tensile properties. The experimental results show that hydrophobic modification of BFRP bars can reduce the water absorption, where the water absorption rate of hydrophobic modified BFRP bars is 40% lower than that of original bars after immersing in water at 45℃ for 60 days. The Arrhenius model has been adopted to predict the long-term performance of BFRP bars. Hydrophobic modified BFRP bars show higher tensile strength retention and longer service life than those of original BFRP. Based on above results, it is found that the hydrophobic fluorinated nano SiO2 modified epoxy resin can reduce the water absorption, improve the strength retention, and prolong the service life of BFRP bars. © 2022, Editorial Office of Acta Materiae Compositae Sinica. All right reserved.
引用
收藏
页码：5228 / 5238
页数：10
相关论文
共 40 条
  • [1] ZHOU A, QIN R, CHOW C L, Et al., Structural performance of FRP confined seawater concrete columns under chloride environment[J], Composite Structures, 216, pp. 12-19, (2019)
  • [2] WANG Qingqing, Study on preparation and performance of basalt fiber reinforced vinyl resin composite, (2015)
  • [3] DHAND V, MITTAL G, RHEE K Y, Et al., A short review on basalt fiber reinforced polymer composites[J], Compo-sites Part B: Engineering, 73, pp. 166-180, (2015)
  • [4] HUO Baorong, ZHANG Xiangdong, Mechanical perfor-mance test of BFRP bar, Journal of Shenyang Jianzhu University: Natural Science Edition, 27, 4, pp. 626-630, (2011)
  • [5] DONG Zhiqiang, WU Gang, Research progress on durabi-lity of FRP bars reinforced concrete structures, China Civil Engineering Journal, 52, 10, pp. 1-19, (2019)
  • [6] WU Jingyu, XIAN Guijun, LI Hui, Et al., Research on durabi-lity of basalt fiber and its composite reinforcement, FRP/Composite Materials, 5, pp. 72-75, (2011)
  • [7] LU Zhongyu, LI Yongchao, XIE Jianhe, Study on the degradation of BFRP bars wrapped in seawater sea sand concrete, Industrial Building, 49, 9, pp. 18-21, (2019)
  • [8] ZARRELLI M, SKORDOS A A, PARTRIDGE I K., Toward a constitutive model for cure-dependent modulus of a high temperature epoxy during the cure[J], European Polymer Journal, 46, 8, pp. 1705-1712, (2010)
  • [9] SHI J, WANG X, DING L, Et al., Degradation of creep behaviors of basalt fiber-reinforced polymer tendons in salt solution[J], Journal of Materials in Civil Engineering, 30, 12, (2018)
  • [10] YI Y, ZHU D, GUO S, Et al., Mitigating the deterioration of BFRP bars in seawater sea sand mortar by reducing alkalinity[J], Construction and Building Materials, 317, (2022)
1234