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石墨烯量子点对蛇纹石混凝土力学性能及微结构的影响

杨昭 石建军 张志恒 陈磊

杨昭, 石建军, 张志恒, 等. 石墨烯量子点对蛇纹石混凝土力学性能及微结构的影响[J]. 复合材料学报, 2024, 42(0): 1-9.
引用本文: 杨昭, 石建军, 张志恒, 等. 石墨烯量子点对蛇纹石混凝土力学性能及微结构的影响[J]. 复合材料学报, 2024, 42(0): 1-9.
YANG Zhao, SHI Jianjun, ZHANG Zhiheng, et al. Effect of graphene quantum dots on mechanical properties and microstructure of serpentine concrete[J]. Acta Materiae Compositae Sinica.
Citation: YANG Zhao, SHI Jianjun, ZHANG Zhiheng, et al. Effect of graphene quantum dots on mechanical properties and microstructure of serpentine concrete[J]. Acta Materiae Compositae Sinica.

石墨烯量子点对蛇纹石混凝土力学性能及微结构的影响

基金项目: 湖南省自然科学基金(14 JJ2083);湖南省科技厅重点研发计划项目(2015 JC3090);湖南省研究生科研创新项目资助(CX20230973)
详细信息
    通讯作者:

    石建军,博士,教授,硕士生导师,研究方向为高性能混凝土及新型组合结构等 E-mail: sjj6621@163.com

  • 中图分类号: TU528.35;TB332

Effect of graphene quantum dots on mechanical properties and microstructure of serpentine concrete

Funds: Hunan Provincial Natural Science Foundation (14 JJ2083); Key Research and Development Projects of Hunan Provincial Science and Technology Department (2015 JC3090); Postgraduate Scientific Research Innovation Project of Hunan Province (CX20230973)
  • 摘要: 为了考察石墨烯量子点(GQDs)作为外掺料改善蛇纹石混凝土性能的可行性,研究了25、150、300、450和600 ℃时GQDs掺量对蛇纹石混凝土强度、结晶水损失率和微结构的影响。结果表明:室温(25 ℃)下,蛇纹石混凝土强度随GQDs掺量的增加而提升,当掺量为0.12wt%时,改善效果最佳,其7、28 d抗压强度和28 d劈裂抗拉强度分别较基准组提高了26.4%、20.9%和27.7%;加热期间,与未掺GQDs的蛇纹石混凝土相比,掺入0.12wt%的GQDs使蛇纹石混凝土结晶水损失率降低了1.8%~20.0%,抗压强度和劈裂抗拉强度分别增加了18.0%~34.0%和29.4%~39.8%;微观试验表明高温环境促使蛇纹石混凝土水化,而GQDs拥有较好的导热性和纳米填充性,在二者共同作用下显著提高了蛇纹石混凝土的微观致密度,且300 ℃时致密度最高。

     

  • 图  1  石墨烯量子点(GQDs)微观表征结果

    Figure  1.  Results of graphene quantum dots (GQDs) microscopic characterization

    图  2  不同GQDs掺量对蛇纹石混凝土抗压强度的影响:(a)抗压强度值;(b)抗压强度增长率

    Figure  2.  Compressive strength of serpentine concrete with different dosage of GQDs: (a) Compressive strength value; (b) Compressive strength growth rate

    图  3  不同GQDs掺量对蛇纹石混凝土劈裂抗拉强度的影响

    Figure  3.  Splitting tensile strength of serpentine concrete with different dosage of GQDs

    图  4  蛇纹石混凝土的结晶水损失率

    Figure  4.  Crystal water loss rate of serpentine concrete

    图  5  高温后蛇纹石混凝土的抗压强度

    Figure  5.  Compressive strength of serpentine concrete exposed to high temperatures

    图  6  高温后蛇纹石混凝土的劈裂抗拉强度

    Figure  6.  Splitting tensile strength of serpentine concrete exposed to high temperatures

    图  7  高温后SG-12的XRD图谱

    Figure  7.  XRD patterns of SG-12 at elevated temperatures

    图  8  高温后SG-12的SEM图像

    Figure  8.  SEM images of SG-12 at elevated temperature

    表  1  水泥和蛇纹石的化学成分

    Table  1.   Chemical compositions of cement and serpentine

    Material type Mass fraction/wt%
    MgO SiO2 Fe2O3 Al2O3 CaO Na2O SO3 Other LOI
    Cement 2.16 21.45 4.37 5.07 60.65 0.58 2.33 1.25 2.14
    Serpentine 42.43 37.56 4.22 0.56 0.32 0.17 0.11 0.79 13.84
    下载: 导出CSV

    表  2  蛇纹石的物理性质

    Table  2.   Physical properties of serpentine

    Aggregate type Apparent density/
    (kg·m−3)
    Bulk density/
    (kg·m−3)
    Voidage/wt% Water
    absorption/wt%
    Moisture
    content/wt%
    Crush
    index/wt%
    Fineness
    modulus
    Fine serpentine 2 320 1 330 43 9.6 5.0 28.0 2.7
    Coarse serpentine 2 600 1 490 43 2.8 1.3 11.7
    下载: 导出CSV

    表  3  蛇纹石混凝土配合比/(kg·m−3)

    Table  3.   Mix proportion of serpentine concrete/(kg·m−3)

    Concrete typeCementCoarse serpentineFine serpentineWaterGQDs
    SG-03751 0396371950
    SG-033751 0396371950.112 5
    SG-063751 0396371950.225 0
    SG-093751 0396371950.337 5
    SG-123751 0396371950.450 0
    下载: 导出CSV
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  • 收稿日期:  2023-11-13
  • 修回日期:  2023-12-18
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