模拟海水-海砂混凝土环境下连续玻璃纤维增强聚丙烯复合材料杆层间剪切性能的演化

周平; 白艳博; 李承高; 董少策; 咸贵军

模拟海水-海砂混凝土环境下连续玻璃纤维增强聚丙烯复合材料杆层间剪切性能的演化

周平^{1, 2},
白艳博^{1, 2},
李承高^{1, 2},
董少策^{1, 2},
咸贵军^{1, 1, 2, ,}

1.
哈尔滨工业大学　结构工程灾变与控制教育部重点实验室, 哈尔滨 150090
2.
哈尔滨工业大学　土木工程学院, 哈尔滨 150090

基金项目: 国家重点研发计划(2022YFB3706503); 中央高校基本科研业务费专项资金资助(HIT.OCEF.2022032); 国家杰出青年科学基金(52008137)

详细信息

通讯作者:
咸贵军，博士，教授，博士生导师，研究方向为土木工程结构纤维增强树脂复合材料与结构　E-mail: gjxian@hit.edu.cn

中图分类号: TB332;TU398+.9
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- 文章访问数: 60
- HTML全文浏览量: 30
- 被引次数: 0
出版历程
- 收稿日期: 2023-03-08
- 修回日期: 2023-04-28
- 录用日期: 2023-05-06
- 网络出版日期: 2023-05-20

Interlaminar shear behavior of glass-fibre reinforced polypropylene rod under seawater and sea sand concrete simulation environment

Ping ZHOU^{1, 2},
Yanbo BAI^{1, 2},
Chenggao LI^{1, 2},
Shaoce DONG^{1, 2},
Guijun XIAN^{1, 1, 2
, ,}

1.
Key Lab of Structures Dynamic Behavior and Control, Harbin Institute of Technology, Ministry of Education, Harbin 150090, China
2.
School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, China

Funds: National Natural Science Foundation of China (2022YFB3706503); Fundamental Research Funds for the Central Universities (HIT.OCEF.2022032); National Natural Science Funds for Distinguished Young Scholar (52008137)

摘要

摘要: 连续玻璃纤维增强聚丙烯(Glass Fibre Reinforced Polypropylene，GFRPP)复合材料杆集成了热塑性树脂可多次成型、环境友好、可回收利用和玻璃纤维高应变、低成本等优点，在混凝土结构领域，GFRPP复合材料有望替代钢筋和热固性FRP筋成为新型热塑性复合材料。本文采用加速试验研究了模拟海水-海砂混凝土环境下GFRPP杆的水吸收及层间剪切性能长期演化规律与退化机理。研究结果表明：GFRPP杆吸水行为符合Fick定律，21、40和60℃浸泡温度下GFRPP杆的饱和吸水率分别为0.63、0.78和0.81%；经120天21、40和60℃模拟海水海砂混凝土孔溶液浸泡后，GFRPP杆层间剪切强度保留率分别为80.5、72.8和66.5%。最后，结合SEM和FTIR表征技术，揭示模拟海水-海砂混凝土孔溶液浸泡下GFRPP杆性能退化机理。1模拟海水-海砂混凝土孔环境GFRPP杆的层间剪切性能演化：(a)长期吸水性能；(b) SEM表征及FTIR能谱分析；(c)层间剪切强度退化
- GFRPP杆 /
- 层间剪切强度 /
- 海水-海砂混凝土 /
- 湿热老化机理
Abstract: Glass-fibre reinforced polypropylene (GFRPP) composite rod integrate the advantages of thermoplastic resin multi-molding, environmental friendliness, recyclability, and high strain and low cost of glass fiber. In the field of concrete structures, GFRPP rods are expected to replace steel bars and thermoset FRP bars as a new composite material. In this paper, accelerated experiments were used to study the long-term evolution of water absorption, interlaminar shear properties and degenerative mechanism of GFRPP rod under simulated seawater and sea sand concrete environment. The results show that the water absorption behavior of GFRPP rod conforms to Fick's law, and the saturation water absorption rates of GFRPP rods at immersion temperatures of 21, 40 and 60°C are 0.63%, 0.78% and 0.81%, respectively. After 120 days of immersion in 21, 40 and 60°C simulated seawater sea sand concrete pore solutions, the shear strength retention rates between GFRPP rods are 80.5%, 72.8% and 66.5%. Finally, the performance degradation mechanism of GFRPP rods under simulated seawater-sea sand concrete pore solution immersion was revealed by combining SEM and FTIR characterization techniques.
- GFRPP rods /
- interlaminar shear strengths /
- seawater and sea sand concrete /
- hydrothermally aging mechanism

HTML全文

图 1 拉挤成型的GFRPP杆(直径6 mm)

Figure 1. Pultruded GFRPP rods (Diameter 6 mm)

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图 2 GFRPP杆短梁剪切测试装置

Figure 2. GFRPP rod short beam shear test device

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图 3 不同浸泡温度下GFRPP杆DMA测试曲线对比

Figure 3. Dynamic thermomechanical analysis (DMA) results of the GFRPP rods under different immersion temperatures

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图 4 不同浸泡温度下GFRPP杆的吸水曲线

Figure 4. Water absorption curve of GFRPP rod at different immersion temperatures

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图 5 GFRPP杆的水吸收扩散系数与温度关系曲线

Figure 5. Curve of water absorption diffusion coefficient vs. temperature of GFRPP rod

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图 6 GFRPP杆层间剪切荷载-位移曲线

Figure 6. Interlaminar shear load deformation curves of the GFRPP rods

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图 7 GFRPP杆老化后层间剪切测试典型荷载-位移曲线

Figure 7. Typical load-displacement curve for ILSS test after GFRPP rod aging

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图 8 不同浸泡温度下GFRPP杆层间剪切强度退化比较

Figure 8. Comparison of ILSS degradation of GFRPP rods at different immersion temperatures

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图 9 老化后GFRPP杆图片

Figure 9. Photos of GFRPP rods after immersion

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图 10 老化前GFRPP杆SEM图像

Figure 10. SEM images of GFRPP rod before immersion

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图 11 120天、60℃模拟溶液GFRPP杆老化形貌

Figure 11. 120-day, 60℃ simulated solution GFRPP rod aging morphology

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图 12 不同浸泡时间下GFRPP杆的FTIR图谱

Figure 12. FTIR spectra of GFRPP rods at different immersion time

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表 1 GFRPP杆的部分力学性能测试数据^[19]

Table 1. Part mechanical properties data of the GFRPP rods^[19]

Mechanical property	Tensile strength/ MPa	Tensile modulus/ GPa	Flexural strength/ MPa	Flexural modulus/ GPa
Mean	632.0	26.2	750.0	20.0
S.D.^a	31.4	2.2	118.0	2.7
Note：a, S.D. is the standard deviation.

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表 2 GFRPP杆的水吸收拟合参数

Table 2. Water absorption fitting parameters of the GFRPP rods

Temperature/℃	D_r/(10⁻¹³m/s)	M_∞/%	R²
21	3.02	0.63	0.989
40	6.73	0.78	0.991
60	16.03	0.81	0.978
Notes: D_r is the water absorption diffusion rate; M_∞ is the saturation water absorption rate; R² is the goodness-of-fit.

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