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少层石墨烯对水泥净浆流动性能及力学性能的影响

何威 许吉航 焦志男

何威, 许吉航, 焦志男. 少层石墨烯对水泥净浆流动性能及力学性能的影响[J]. 复合材料学报, 2021, 39(0): 1-13
引用本文: 何威, 许吉航, 焦志男. 少层石墨烯对水泥净浆流动性能及力学性能的影响[J]. 复合材料学报, 2021, 39(0): 1-13
Wei HE, Jihang XU, Zhinan JIAO. Effect of few-layer graphene on the fluidity and mechanical properties of cement paste[J]. Acta Materiae Compositae Sinica.
Citation: Wei HE, Jihang XU, Zhinan JIAO. Effect of few-layer graphene on the fluidity and mechanical properties of cement paste[J]. Acta Materiae Compositae Sinica.

少层石墨烯对水泥净浆流动性能及力学性能的影响

基金项目: 国家自然科学基金(51578477)
详细信息
    通讯作者:

    何威,博士,教授,研究方向为水泥基复合材料  E-mail:hewei@ysu.edu.cn

  • 中图分类号: TB332

Effect of few-layer graphene on the fluidity and mechanical properties of cement paste

  • 摘要: 系统研究了少层石墨烯(Few-layer graphene,FLG)对水泥净浆流动性能和力学性能(抗压强度和抗折强度)的影响,通过SEM、XRD、EDS剖析了FLG对净浆力学性能影响的作用机理。同时利用了AFM、Raman、SEM等技术表征了FLG的层数和结构。结果表明:FLG的层数在3~6层,呈现六角型蜂窝结构,有层间堆叠现象。FLG的掺入能降低净浆的流动性,净浆3 天和28 天抗压强度分别提升了27.84%和13.52%,3 天和28天抗折强度分别提升了12.92%和19.68%。FLG具有模板效应能够促进水泥水化产物的生长,改变水化晶体的形状、尺寸,使其有形成完整、致密的趋势,使净浆结构更加密实。

     

  • 图  1  少层石墨烯(FLG)模拟图及外观

    Figure  1.  Few-layer graphene (FLG) simulation diagram and appearance

    图  2  机械搅拌加超声分散制备FLG分散液

    Figure  2.  Preparation of FLG dispersion by mechanical agitation and ultrasonic dispersion

    图  3  FLG的微观形貌

    Figure  3.  Microstructure of FLG

    图  4  FLG的AFM相图

    Figure  4.  AFM phase diagram of graphene with few layers

    图  5  FLG高厚图

    Figure  5.  FLG height and thickness diagram

    图  6  FLG的Raman谱图

    Figure  6.  Raman spectrum of FLG

    图  7  FLG的XRD图谱

    Figure  7.  XRD pattern of FLG

    图  8  FLG的傅里叶变换红外光谱图

    Figure  8.  Fourier transform INFRARED spectra of FLG

    图  9  FLG/水泥净浆扩展度随FLG掺量变化趋势

    Figure  9.  Variation trend of FLG/PC net slurry expansion with FLG content

    图  10  FLG/水泥净浆3天、28天抗压强度随FLG掺量变化趋势

    Figure  10.  Variation trend of the 3-day and 28-day compressive strength of FLG/PC net slurry with FLG content

    图  11  FLG/水泥净浆3天、28天抗折强度随FLG掺量变化趋势

    Figure  11.  Variation trend of 3-day and 28-day flexural strength of FLG/PC net slurry with FLG content

    图  12  养护3天不同FLG掺量的 FLG/水泥净浆微观形貌

    Figure  12.  Microstructures of FLG/PC net slurry with different FLG contents after curing for 3 days

    图  13  养护28天不同FLG掺量的FLG/水泥净浆微观形貌

    Figure  13.  Microstructures of FLG/PC net slurry with different FLG contents after curing for 28 days

    图  14  不同掺量FLG /水泥净浆养护28天水化产物的元素能谱图

    Figure  14.  Elemental energy spectra of hydration products of FLG/ PC net slurry with different FLG dosages after curing for 28 days

    图  15  养护3天后不同FLG掺量的FLG/水泥净浆XRD图谱

    Figure  15.  XRD patterns of FLG/PC net slurry with different FLG contents after curing for 3 days

    图  16  养护28天后不同FLG掺量的FLG/水泥净浆XRD图谱

    Figure  16.  XRD patterns of FLG/PC net slurry with different FLG contents after curing for 28 days

    表  1  FLG参数

    Table  1.   FLG parameters

    TypeSpecific area/
    (m2·g−1)
    Tap density/
    (g·cm−3)
    pHMoisture/%Mass fraction of carbon/%Mass fraction of oxygen/%Mass fraction of sulfur/%
    FLG458.550.0227.100.54≥98.0<1.0<0.1
    下载: 导出CSV

    表  2  PO42.5水泥化学分析结果(wt%)

    Table  2.   Chemical analysis results of PO42.5 cement (wt%)

    SiO2Al2O3Fe2O3CaOMgOSO3Na2OK2OCl-f-CaOR2O
    21.477.173.1160.042.902.770.110.700.0240.570.57
    下载: 导出CSV

    表  3  PO42.5水泥物理性能检测结果

    Table  3.   Physical performance test results of PO42.5 cement

    Density /
    (g·cm−3)
    Degree of powderSetting timeStabilityFlexural
    strength /MPa
    Compressive
    strength /MPa
    Specific surface
    area /(m2·kg−1)
    80μ/%Consistency/%Initial setting/minFinal set/minRay type method/mm3 d28 d3 d28 d
    3.063510.2828.0170235Qualified5.68.929.057.3
    下载: 导出CSV

    表  4  FLG/水泥净浆复合材料试件编号

    Table  4.   Specimen number of FLG/PC net slurry composite

    FLG content/wt%00.020.040.060.080.10.51
    Specimen number0 wt%
    FLG/PC
    0.02 wt%
    FLG/PC
    0.04 wt%
    FLG/PC
    0.06 wt%
    FLG/PC
    0.08 wt%
    FLG/PC
    0.1 wt%
    FLG/PC
    0.5 wt%
    FLG/PC
    1 wt%
    FLG/PC
    Note: PC stands for PO42.5 ordinary Portland cement.
    下载: 导出CSV

    表  5  养护28天FLG/水泥净浆复合材料水化产物的元素组成及质量分数

    Table  5.   Elemental composition and mass fraction of hydration products of FLG/PC net slurry composite after curing for 28 days

    Element type0 wt%FLG/PC0.04 wt%FLG/PC1 wt%FLG/PC
    C8.1713.046.70
    O50.7451.7743.84
    Mg0.360.690.47
    Al2.731.744.57
    Si7.897.8010.51
    S1.711.211.50
    K1.021.661.95
    Ca27.3822.0930.46
    下载: 导出CSV
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出版历程
  • 收稿日期:  2021-09-22
  • 录用日期:  2021-11-03
  • 修回日期:  2021-10-27
  • 网络出版日期:  2021-11-26

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