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氧化石墨烯接枝碳纤维增强体改性混凝土的力学性能

王志航 白二雷 任彪 刘超佳 周俊鹏

王志航, 白二雷, 任彪, 等. 氧化石墨烯接枝碳纤维增强体改性混凝土的力学性能[J]. 复合材料学报, 2024, 42(0): 1-12.
引用本文: 王志航, 白二雷, 任彪, 等. 氧化石墨烯接枝碳纤维增强体改性混凝土的力学性能[J]. 复合材料学报, 2024, 42(0): 1-12.
WANG Zhihang, BAI Erlei, REN Biao, et al. Mechanical properties of concrete modified by graphene oxide grafted carbon fiber reinforcement[J]. Acta Materiae Compositae Sinica.
Citation: WANG Zhihang, BAI Erlei, REN Biao, et al. Mechanical properties of concrete modified by graphene oxide grafted carbon fiber reinforcement[J]. Acta Materiae Compositae Sinica.

氧化石墨烯接枝碳纤维增强体改性混凝土的力学性能

基金项目: 国家自然科学基金(52278287)
详细信息
    通讯作者:

    白二雷,博士,副教授,研究方向为防护工程 E-mail:bwxkgy@163.com

  • 中图分类号: TU528

Mechanical properties of concrete modified by graphene oxide grafted carbon fiber reinforcement

Funds: National Natural Science Foundation of China (52278287)
  • 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。

     

  • 图  1  碳纤维

    Figure  1.  Carbon fiber

    图  2  氧化石墨烯

    Figure  2.  Graphene oxide

    图  3  CF-GO的制备步骤

    Figure  3.  Preparation procedure of CF-GO

    图  4  氨基硅烷

    Figure  4.  Amino silane

    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  6  CF-GO/C拌合物的制备流程

    Figure  6.  Preparation process of CF-GO/C mixture

    图  7  碳纤维单丝界面剪切样品

    Figure  7.  Carbon fiber monofilament interface shear specimen

    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  12  CF-GO/C的抗折强度

    Figure  12.  Flexural strength of CF-GO/C

    图  13  CF-GO/C的抗折试验破坏形态

    Figure  13.  Flexural test failure morphology of CF-GO/C

    图  14  CF-GO/C的抗压强度

    Figure  14.  Compressive strength of CF-GO/C

    图  15  CF-GO/C的抗压试验破坏形态

    Figure  15.  Compressive test failure morphology of CF-GO/C

    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  17  混凝土的微观形貌

    Figure  17.  Microstructure of concrete

    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.CementGravelSandWaterWater reducerDefoamerCF-GOCarbon fiber
    PC13313646423401.460.27--
    0.1%CF-GO/C1.76-
    0.2%CF-GO/C3.52-
    0.3%CF-GO/C5.28-
    0.4%CF-GO/C7.04-
    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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  • 收稿日期:  2023-11-14
  • 修回日期:  2023-12-11
  • 录用日期:  2023-12-21
  • 网络出版日期:  2024-01-08

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