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石墨烯在水泥净浆中的分散特性

吕骄阳 李思李 田波 权磊 李立辉

吕骄阳, 李思李, 田波, 等. 石墨烯在水泥净浆中的分散特性[J]. 复合材料学报, 2022, 39(10): 1-11 doi: 10.13801/j.cnki.fhclxb.20211214.002
引用本文: 吕骄阳, 李思李, 田波, 等. 石墨烯在水泥净浆中的分散特性[J]. 复合材料学报, 2022, 39(10): 1-11 doi: 10.13801/j.cnki.fhclxb.20211214.002
Jiaoyang LV, Sili LI, Bo TIAN, Lei QUAN, Lihui LI. Dispersion characteristics of graphene in cement paste[J]. Acta Materiae Compositae Sinica, 2022, 39(10): 1-11. doi: 10.13801/j.cnki.fhclxb.20211214.002
Citation: Jiaoyang LV, Sili LI, Bo TIAN, Lei QUAN, Lihui LI. Dispersion characteristics of graphene in cement paste[J]. Acta Materiae Compositae Sinica, 2022, 39(10): 1-11. doi: 10.13801/j.cnki.fhclxb.20211214.002

石墨烯在水泥净浆中的分散特性

doi: 10.13801/j.cnki.fhclxb.20211214.002
基金项目: 国家重点研发计划项目(2018YFB1600100);国家自然科学基金青年基金项目(51908260);中央级公益性科研院所基本科研业务费专项资金项目(2017-9060)
详细信息
    通讯作者:

    李思李,博士研究生,研究方向为公路工程 E-mail:decoli27@gmail.com

  • 中图分类号: U414

Dispersion characteristics of graphene in cement paste

  • 摘要: 为研究水泥净浆中石墨烯的分散方式和分散程度的评价方法,采用不同阴离子表面活性剂作分散助剂分散石墨烯材料,通过高速物理搅拌与超声分散方法制备石墨烯分散液。采用紫外-可见分光光度法、静置沉降法、电阻率、SEM以及能谱测试观测石墨烯在碱性溶液、水泥净浆、及其水泥净浆水化硬化产物中的分布方式,分析它们的分散均匀性。结果表明:在水泥基材料碱性环境中,具有耐碱性高亲油基团的分散剂,引入一定程度气泡微珠有助于提高石墨烯的分散均匀性和经时稳定性以及削弱石墨烯在水泥净浆中的上浮效应,同时,其断面石墨烯分散均匀性能够提高30%。采用分光光度计法、静置法和电阻法评价石墨烯在碱性溶液中的分散效果,简单有效。

     

  • 图  1  水性环境下不同分散剂在波长190~1100 nm的吸光度曲线

    Figure  1.  Absorbance curves of different dispersants at 190-1100 nm in aqueous environment

    图  2  碱性环境下不同分散剂在波长190~1100 nm的吸光度曲线

    Figure  2.  Absorbance curves of different dispersants at 190-1100 nm in alkaline environment

    图  3  分散液6 h稳定性表观图

    Figure  3.  Visual diagram of dispersion stability for 6 h

    图  4  分散液12 h稳定性表观图

    Figure  4.  Visual diagram of dispersion stability for 12 h

    图  5  絮凝现象表观图

    Figure  5.  Visual diagram of the flocculation phenomenon

    图  6  石墨烯对水泥净浆的电阻率(a)及电导率(b)经时变化对比

    Figure  6.  Resistivity (a) and conductivity (b) of graphene reinforced cement paste versus time

    图  7  不同水灰比石墨烯/水泥净浆电阻率(a)及电导率(b)经时变化

    Figure  7.  Resistivity (a) and conductivity (b) of graphene reinforced cement pastes with different water-cement ratios vary with time

    图  8  引气剂不同掺量的石墨烯/水泥净浆电阻率(a)及电导率(b)经时变化对比

    Figure  8.  Comparison of resistivity (a) and electrical conductivity (b) of graphene reinforced cement pastes with different dosages of air entraining agent

    图  9  不同掺量石墨烯的石墨烯/水泥净浆电阻率(a)及电导率(b)变化及对比

    Figure  9.  Resistivity (a) and conductivity (b) of graphene reinforced cement pastes with different dosages of graphene

    图  10  石墨烯/水泥净浆SEM图像: (a) 空白组;(b)掺加 0.01wt%石墨烯;(c)掺加 0.1wt%石墨烯

    Figure  10.  SEM images of graphene reinforced cement pastes: (a) Blank group; (b) Doped with 0.01wt% graphene; (c) Doped with 0.1wt% graphene

    图  11  石墨烯/水泥净浆碳元素能谱分析

    Figure  11.  Carbon element energy spectrum analysis of graphene reinforced cement pastes

    C norm.—Carbon normative mineral ingredient content

    表  1  石墨烯的物理参数

    Table  1.   Physical parameters of graphene

    ModelDensity/(g·cm−3)Purity
    /%
    Conductivity characteristicTensile modulus/GPa
    Electrical conductivity/(Ω−1·cm−1)Resistivity/(mΩ·cm)
    K-10.2>99.57.141.41000
    下载: 导出CSV

    表  2  所用分散剂类型

    Table  2.   Types of dispersants used

    Reagent
    number
    Reagent type
    KT1D.BASF plurafac LF221:An alkoxy compound of a nonbranched fatty alcohol
    KT2Coconut diethanol amide 6501:Coconut oil fatty acid diethanolamide
    KT3Triton(TM) CF-10 surfactant:Water-soluble non-ionic surfactant
    KT4303:Fatty alcohol polyoxyethylene ether sodium sulfate surfactant
    KT5Dispersible liquid A:Polyvinylpyrrolidone (PVP)
    KT6Polycarboxylate superplasticizer HWR-S
    KT7Plant polyene phenol polyoxyethylene ether Nsf-10e
    KT80.02% A5 hardening accelerating WR-A
    KT9MZY-A5 HPWR-S
    KT10Rosin modified polymer SY-1
    下载: 导出CSV

    表  3  试剂类型

    Table  3.   Reagent type

    Reagent numberGroupReagent type
    A(pH=7)B(pH>7)100 mL water100 mL NaOH20 mg graphene
    1KT1-AddNoneAdd
    2KT2-AddNoneAdd
    3KT3-AddNoneAdd
    4KT4-AddNoneAdd
    5KT6-AddNoneAdd
    6Blank-AddNoneAdd
    7-KT3NoneAddAdd
    8-KT1NoneAddAdd
    9-KT2NoneAddAdd
    10-KT6NoneAddAdd
    11-KT4NoneAddAdd
    12-KT7NoneAddAdd
    13-KT8NoneAddAdd
    14-KT5NoneAddAdd
    15-KT5AddNoneAdd
    16-KT9NoneAddAdd
    17-KT10NoneAddAdd
    18-BlankNoneAddAdd
    下载: 导出CSV
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出版历程
  • 收稿日期:  2021-08-26
  • 录用日期:  2021-11-27
  • 修回日期:  2021-11-16
  • 网络出版日期:  2021-12-17
  • 刊出日期:  2022-10-15

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