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单掺/复掺碳纳米管和纳米二氧化钛硫铝酸盐水泥复合材料力学与自感知性能的影响

张立卿 肖振荣 许开成 王云洋 韩宝国

张立卿, 肖振荣, 许开成, 等. 单掺/复掺碳纳米管和纳米二氧化钛硫铝酸盐水泥复合材料力学与自感知性能的影响[J]. 复合材料学报, 2024, 42(0): 1-14.
引用本文: 张立卿, 肖振荣, 许开成, 等. 单掺/复掺碳纳米管和纳米二氧化钛硫铝酸盐水泥复合材料力学与自感知性能的影响[J]. 复合材料学报, 2024, 42(0): 1-14.
ZHANG Liqing, XIAO Zhenrong, XU Kaicheng, et al. Effect of monodoped/multi-doped carbon nanotubes and nano-titanium dioxide on mechanical and self-sensing properties of sulfoaluminate cementitious composites[J]. Acta Materiae Compositae Sinica.
Citation: ZHANG Liqing, XIAO Zhenrong, XU Kaicheng, et al. Effect of monodoped/multi-doped carbon nanotubes and nano-titanium dioxide on mechanical and self-sensing properties of sulfoaluminate cementitious composites[J]. Acta Materiae Compositae Sinica.

单掺/复掺碳纳米管和纳米二氧化钛硫铝酸盐水泥复合材料力学与自感知性能的影响

基金项目: 国家自然基金项目(52368031, 51968021);中国博士后科学基金项目(2022M713497); 江西省科技厅面上项目(20224BAB204067); 江西省研究生创新专项资金项目(YC2023-S491); 湖南省教育厅优秀青年科研项目(23B0652)
详细信息
    通讯作者:

    王云洋,博士,副教授,研究方向为智能混凝土材料与结构、自感知水泥基复合材料 E-mail: hnwangyunyang@126.com

  • 中图分类号: TU528;TB333

Effect of monodoped/multi-doped carbon nanotubes and nano-titanium dioxide on mechanical and self-sensing properties of sulfoaluminate cementitious composites

Funds: The National Natural Science Foundation of China (52368031, 51968021); China Postdoctoral Science Foundation (2022M713497); Science and Technology Department of Jiangxi Province (20224BAB204067); Jiangxi Province Graduate Student Innovation Fund Project (YC2023-S491); The Excellent Youth Research Project of Hunan Provincial Department of Education (23B0652)
  • 摘要: 多壁碳纳米管(MWCNTs)和锐钛型纳米二氧化钛(NT)是制备自感知水泥基材料的两种优异纳米填料。与普通硅酸盐水泥比,硫铝酸盐水泥具有低碳、耐腐蚀和强度发展快等优点,作为胶凝材料时水泥基复合材料可获得更稳定的自感知性能。因此,本文使用锐钛型纳米二氧化钛和多壁碳纳米管分别以单掺和复掺的方式复合硫铝酸盐水泥砂浆,研究了复合导电填料类型对硫铝酸盐水泥复合材料3d力学、电学和自感知性能的影响规律,并结合SEM-EDS分析了影响机制。研究结果表明:NT可显著提高硫铝酸盐水泥复合材料的3d力学性能,单掺NT的试件抗压强度、抗折强度、劈拉强度和压缩韧性较不掺NT试件分别提高了28.36%、10.67%、47.76%和9.53%。单掺MWCNTs对复合材料的导电性能改善效果最为显著,直流电阻率和频率为100 kHz时的交流电阻率较对照组分别下降了46.91%和63.87%。复掺MWCNTs-NT对复合材料自感知性能改善效果最为明显:相比于对照组,在单调压缩荷载和劈拉荷载作用下,复掺MWCNTs-NT复合材料的最大电阻率变化率、应力灵敏度和应变灵敏度分别提高了235%、211%、313%和44%、65%、648%。通过SEM-EDS观察到,就密实程度而言,单掺NT组>对照组>复掺MWCNTs-NT组>单掺MWCNTs组;就导电网络变化的敏感度而言,复掺MWCNTs-NT组>单掺NT组>单掺MWCNTs组>对照组。

     

  • 图  1  原材料SEM图

    Figure  1.  SEM images of raw materials

    图  2  硫铝酸盐水泥复合材料制备流程

    Figure  2.  Fabrication process of sulfoaluminate cementitious composites

    图  3  硫铝酸盐水泥复合材料压敏加载示意图(单位:mm)

    Figure  3.  Loading diagram of piezoresistivity test of sulfoaluminate cementitious composites (unit: mm)

    图  4  掺不同复合导电填料硫铝酸盐水泥复合材料3d强度

    Figure  4.  Strength of sulfoaluminate cementitious composites with different types of conductive fillers at 3days curing

    图  5  掺不同复合导电填料硫铝酸盐水泥复合材料3d压缩功

    Figure  5.  Compression power of sulfoaluminate cementitious composites with different types of conductive fillers at 3days curing

    图  6  掺不同复合导电填料硫铝酸盐水泥复合材料3d直流电阻率

    Figure  6.  DC electrical resistivity of sulfoaluminate cementitious composites with different types of conductive fillers at 3days curing

    图  7  掺不同复合导电填料硫铝酸盐水泥复合材料3d交流电阻率

    Figure  7.  AC electrical resistivity of sulfoaluminate cementitious composites with different types of conductive fillers at 3days curing

    图  8  单调压缩荷载作用下掺不同导电材料硫铝酸盐水泥复合材料应力/应变与电阻率变化率关系

    Figure  8.  Relationship between stress/strain and resistivity change rate of sulfoaluminate cementitious composites with different types of conductive fillers under monotonic compressive load

    图  9  单调压缩荷载作用下掺不同导电材料硫铝酸盐水泥复合材料自感知性能指标

    Figure  9.  Self-sensing performance index of sulfoaluminate cementitious composites with different types of conductive fillers under monotonic compressive load

    图  10  劈拉荷载作用下掺不同导电材料硫铝酸盐水泥复合材料应力/应变与电阻率变化率关系

    Figure  10.  Relationship between stress/strain and resistivity change rate of sulfoaluminate cementitious composites with different types of conductive fillers under split tensile load

    图  11  劈拉荷载作用下掺不同导电材料硫铝酸盐水泥复合材料自感知性能指标

    Figure  11.  Self-sensing performance index of sulfoaluminate cementitious composites with different types of conductive fillers under split tensile load

    图  12  掺不同复合导电填料的硫铝酸盐水泥复合材料在养护3d后的SEM图

    Figure  12.  SEM image of sulfoaluminate cementitious composites with different types of conductive fillers at 3days curing

    图  13  MWCNTs在硫铝酸盐水泥复合材料基体内分散程度

    Figure  13.  Dispersion degree of MWCNTs in sulfoaluminate cementitious composites

    图  14  掺不同复合导电填料的硫铝酸盐水泥复合材料在养护3d后的SEM图像和EDS面扫结果

    Figure  14.  SEM image and EDS surface scanning results of sulfoaluminate cementitious composites with different types of conductive fillers at 3days curing

    表  1  低碱度硫铝酸盐水泥的物理性能

    Table  1.   Physical properties of low alkalinity sulfoaluminate cement

    Stability Setting time/min Flexural strength /MPa Compressive strength/MPa Special surface are/(m2·kg−1)
    Initial setting time Final setting time 1 d 1 d
    Qualified 25 30 6.30 36.20 420
    下载: 导出CSV

    表  2  多壁碳纳米管(MWCNTs)物理参数

    Table  2.   Physical properties of multi-walled carbon nanotubes (MWCNTs)

    Outer diameter /nm Inner diameter
    /nm
    Length/μm Special surface area/(m2·g−1) Purity/% Color
    30-80 5-15 <10 >60 >95% Black
    下载: 导出CSV

    表  3  硫铝酸盐水泥复合材料配合比

    Table  3.   Mix proportions of sulfoaluminate cementitious composites

    NumberCementCTFAWaterMWCNTs(vol%)NT(vol%)Superplasticizer(wt%)
    C0 T0110.40000
    C0 T1110.4003.000
    C1 T0110.400.6702.00
    C1 T1110.400.673.002.00
    Notes: CTFA are ceramic tile fine aggregates; MWCNTs are multi-walled carbon nanotubes; NT are anatase nano-titanium dioxide.
    下载: 导出CSV
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  • 收稿日期:  2024-04-17
  • 修回日期:  2024-05-15
  • 录用日期:  2024-05-31
  • 网络出版日期:  2024-06-21

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