Mechanical properties of concrete modified by graphene oxide grafted carbon fiber reinforcement
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摘要: 为增强碳纤维/混凝土基体界面性能，探究氧化石墨烯接枝碳纤维增强体(CF-GO)对混凝土力学性能的影响规律，以氨基硅烷为桥接物，将碳纤维和氧化石墨烯通过化学键紧密结合，制备了CF-GO。利用扫描电子显微镜和红外光谱仪对CF-GO的微观形貌和官能团进行表征，确定了氧化石墨烯成功接枝到碳纤维表面，并测试了CF-GO的界面剪切强度。制备了CF-GO改性混凝土(CF-GO/C)，测试了其力学性能，并与碳纤维改性混凝土进行了对比。此外，分析了CF-GO对混凝土力学性能的改性机理。结果表明：CF-GO的界面剪切强度较碳纤维增大了25.37%。随着CF-GO掺量的增大，CF-GO/C的抗折和抗压强度均先增大后减小。CF-GO的最佳掺量为0.3%，碳纤维的最佳掺量为0.2%。在最佳掺量下，CF-GO/C的抗折和抗压强度分别增大了33.21%、24.63%。CF-GO表面的氧化石墨烯通过提高CF-GO与混凝土基体的机械咬合力和促进水化产物在CF-GO表面的生成，从物理和化学两方面增强CF-GO/混凝土基体界面。Abstract: In order to enhance the interface properties of carbon fiber/concrete matrix, and investigate the effects of graphene oxide grafted carbon fiber reinforcement (CF-GO) on the mechanical properties of concrete, by using amino silane as bridge material, carbon fiber and graphene oxide were tightly bonded through chemical bonds and graphene oxide grafted carbon fiber reinforcement (CF-GO) was prepared. The microstructure and functional groups of CF-GO were characterized by scanning electron microscopy and infrared spectroscopy. Graphene oxide was successfully grafted to the surface of carbon fiber and the interfacial shear strength of CF-GO was tested. CF-GO modified concrete (CF-GO/C) was prepared, its mechanical properties were tested and compared with those of carbon fiber modified concrete. In addition, the modification mechanism of CF-GO on the mechanical properties of concrete was analyzed. The results show that the interfacial shear strength of CF-GO increases by 25.37% compared with that of carbon fiber. With the increase of CF-GO content, the flexural and compressive strength of CF-GO/C first increase and then decrease. The optimal content of CF-GO is 0.3%, and the optimal content of carbon fiber is 0.2%. The flexural and compressive strength of CF-GO/C increase by 33.21% and 24.63% respectively with the optimal CF-GO content. Graphene oxide on the surface of CF-GO enhances the interface of CF-GO/concrete matrix physically and chemically by improving the mechanical bite between CF-GO and concrete matrix and promoting the formation of hydration products on the surface of CF-GO.
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Key words:
- concrete /
- carbon fiber /
- graphene oxide /
- chemical graft /
- mechanical property
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图 5 高效减水剂与超声波结合分散制备CF-GO分散液
Figure 5. Preparation of CF-GO dispersion solution by combining high-efficiency water reducer with ultrasonic wave
图 8 CF-GO制备过程中碳纤维表面的微观形貌及EDS分析
Figure 8. Microstructure and EDS analysis of carbon fiber surface during the preparation of CF-GO
图 9 CF-GO制备过程中碳纤维表面各个阶段的红外光谱
Figure 9. Infrared spectra of carbon fiber surface at various stages during the preparation of CF-GO
图 10 CF-GO制备过程中碳纤维各个阶段的界面剪切强度
Figure 10. Interfacial shear strength of carbon fiber at various stages during the preparation of CF-GO
图 11 CF-GO单丝界面剪切试验后的SEM图像
Figure 11. SEM image of CF-GO after monofilament interfacial shear test
图 16 CF-GO/C与CF/C的力学性能对比
Figure 16. Comparison of mechanical properties of CF-GO/C and CF/C
图 18 氧化石墨烯对碳纤维/混凝土基体界面的增强作用
Figure 18. Improvement effect of graphene oxide on the interface between carbon fiber/concrete matrix
表 1 CF-GO/C与CF/C的配合比(kg/m3)
Table 1. Mix ratio of CF-GO/C and CF/C (kg/m3)
Specimen No. Cement Gravel Sand Water Water reducer Defoamer CF-GO Carbon fiber PC 133 1364 642 340 1.46 0.27 - - 0.1%CF-GO/C 1.76 - 0.2%CF-GO/C 3.52 - 0.3%CF-GO/C 5.28 - 0.4%CF-GO/C 7.04 - 0.1%CF/C - 1.76 0.2%CF/C - 3.52 0.3%CF/C - 5.28 0.4%CF/C - 7.04 Notes: Since the density of CF-GO can not be measured effectively, the density of graphene oxide (0.013 g/cm3) is much smaller than that of carbon fiber (1.76 g/cm3). Therefore, for the convenience of calculation, the density of CF-GO is equivalent to that of carbon fiber when preparing CF-GO/C. PC—Plain concrete without fiber, 0.1%CF-GO/C-0.4%CF-GO/C—CF-GO/C with CF-GO volume content of 0.1 vol%-0.4 vol%, 0.1%CF/C-0.4%CF/C—CF/C with carbon fiber volume content of 0.1 vol%-0.4 vol%. 
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