Interlaminar shear behavior of glass-fibre reinforced polypropylene rod under seawater and sea sand concrete simulation environment
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摘要: 连续玻璃纤维增强聚丙烯(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纤维增强聚合物(FRP)筋成为新型热塑性复合材料。本文采用加速实验研究了模拟海水-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制。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杆性能退化机制。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 fibre reinforced polyer (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°C, 40°C and 60°C are 0.63%, 0.78% and 0.81%, respectively. After 120 days of immersion in 21°C, 40°C 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.
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图 1 拉挤成型的玻璃纤维增强聚丙烯(GFRPP)杆(直径6 mm)
Figure 1. Pultruded glass fibre reinforced polypropylene (GFRPP) rods (Diameter 6 mm)
图 3 不同浸泡温度下GFRPP杆动态热机械分析(DMA)曲线
Figure 3. Dynamic thermomechanical analysis (DMA) curves of the GFRPP rods under different immersion temperatures
图 4 不同浸泡温度下GFRPP杆的吸水曲线
Figure 4. Water absorption curves of GFRPP rod at different immersion temperatures
R2—Goodness of fit
图 5 GFRPP杆的水吸收扩散系数(Dr)与温度(T)关系曲线
Figure 5. Curve of water absorption diffusion coefficient (Dr) vs temperature (T) of GFRPP rod
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
图 7 GFRPP杆老化后层间剪切强度(ILSS)测试典型荷载-位移曲线
Figure 7. Typical load-displacement curves for interlaminar shear strength (ILSS) test after GFRPP rod aging
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
图 10 老化前GFRPP杆SEM图像
Figure 10. SEM images of GFRPP rod before aging
GF—Glass fiber; PP—Polypropylene
图 11 120天、60℃模拟溶液GFRPP杆老化SEM 图像
Figure 11. SEM images of GFRPP rod aging in 120 days, 60℃ simulated solution
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
Mechanical
propertyTensile
strength/
MPaTensile
modulus/
GPaFlexural
strength/
MPaFlexural
modulus/
GPaMean 632.0 26.2 750.0 20.0 Standard
deviation31.4 2.2 118.0 2.7 
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表 2 GFRPP杆的水吸收拟合参数
Table 2. Water absorption fitting parameters of GFRPP rods
Temperature/℃ Dr/(10−13 m·s-1) M∞/% R2 21 3.02 0.63 0.989 40 6.73 0.78 0.991 60 16.03 0.81 0.978 Notes: Dr—Water absorption diffusion coefficient; M∞—Saturation water absorption rate.
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