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高掺量硅灰石纤维对偏高岭土基地聚物性能和微结构的影响

张全超 黄大建 张小鹏 强小虎 路旭斌 林龙沅

张全超, 黄大建, 张小鹏, 等. 高掺量硅灰石纤维对偏高岭土基地聚物性能和微结构的影响[J]. 复合材料学报, 2023, 40(8): 4694-4702. doi: 10.13801/j.cnki.fhclxb.20221108.002
引用本文: 张全超, 黄大建, 张小鹏, 等. 高掺量硅灰石纤维对偏高岭土基地聚物性能和微结构的影响[J]. 复合材料学报, 2023, 40(8): 4694-4702. doi: 10.13801/j.cnki.fhclxb.20221108.002
ZHANG Quanchao, HUANG Dajian, ZHANG Xiaopeng, et al. Effect of high wollastonite fiber incorporation on metakaolin base geopolymers' properties and microstructure[J]. Acta Materiae Compositae Sinica, 2023, 40(8): 4694-4702. doi: 10.13801/j.cnki.fhclxb.20221108.002
Citation: ZHANG Quanchao, HUANG Dajian, ZHANG Xiaopeng, et al. Effect of high wollastonite fiber incorporation on metakaolin base geopolymers' properties and microstructure[J]. Acta Materiae Compositae Sinica, 2023, 40(8): 4694-4702. doi: 10.13801/j.cnki.fhclxb.20221108.002

高掺量硅灰石纤维对偏高岭土基地聚物性能和微结构的影响

doi: 10.13801/j.cnki.fhclxb.20221108.002
基金项目: 甘肃省自然科学基金(20JR5RA426)
详细信息
    通讯作者:

    黄大建,博士,副教授,硕士生导师,研究方向为建筑材料、地质聚合物、生物材料、矿物材料 E-mail: huangdj2015@yeah.net

  • 中图分类号: TB321;TB333

Effect of high wollastonite fiber incorporation on metakaolin base geopolymers' properties and microstructure

Funds: National Natural Science Foundation of Gansu Province (20JR5RA426)
  • 摘要: 为了研究高添加量的硅灰石纤维对偏高岭土-矿渣地聚物力学性能及开裂特性的影响,以硅灰石纤维替代质量分数(最高40wt%)为实验参数,制备了硅灰石/偏高岭土-矿渣地聚物,评估了与硅灰石含量有关的性能(力学强度、孔隙率和裂纹),并研究了硅灰石纤维对地聚物微结构的影响。结果表明:硅灰石纤维的加入对处于干燥环境下的地聚物抑制开裂行为有积极作用,且在替代量为40wt%以内是持续改善的;同时也观察到硅灰石纤维的加入对地聚物力学性能也有积极影响,其中硅灰石纤维替代量为20wt%的地聚物28天强度达到70.2 MPa,较偏高岭土基地聚物样品抗压强度增长了36%,但继续增加硅灰石纤维会导致地聚物抗压强度的降低;此外沸石相在复合物中被检测到,硅灰石的添加有利于沸石相的发展。

     

  • 图  1  硅灰石(WS)的SEM图像

    Figure  1.  SEM images of wollastonite (WS)

    图  2  地聚物样品的XRD图谱

    W—Wollastonite, CaSiO3; Q—Quartz, SiO2; C—Corundum, Al2O3; Ca—Calcite, Ca6C3O18; Z—Zeolites, Na96Al96Si96O384·216H2O; T—Thermonatrite, Na2CO3·H2O

    Figure  2.  XRD patterns of geopolymer samples

    图  3  不同掺杂比例的地聚物的FTIR图谱

    Figure  3.  FTIR spectra of geopolymers with different doping ratios

    图  4  28天龄期的地聚物试样的宏观裂缝

    Figure  4.  Macroscopic cracks of geopolymer samples kept for 28 days

    图  5  28天龄期的地聚物试样的SEM图像

    ITZ—Interface transition zone

    Figure  5.  SEM images of geopolymer samples kept for 28 days

    图  6  地聚物试件的低场核磁共振(LF-NMR) 横向弛豫时间(T2)分布曲线

    Figure  6.  Low-field nuclear magnetic resonance (LF-NMR) transversal relaxation time (T2) distribution curves of geopolymer samples

    图  7  地聚物试件的热重分析

    Figure  7.  Thermogravimetric analyses of geopolymer samples

    图  8  地聚物试件的TG和DSC曲线

    Figure  8.  TG and DSC curves of geopolymer samples

    图  9  3天、7天和28天固化的地聚物样品的抗压强度

    Figure  9.  Compressive strengths of 3 days, 7 days and 28 days cured geopolymer samples

    表  1  原料的主要成分及含量

    Table  1.   Main compositions and content of materials (wt%)

    MaterialSiO2Al2O3Fe2O3MgOCaO
    Metakaolin (MK)47.8343.543.5500.68
    Slag (GGBFS)31.2613.631.136.3440.20
    Wollastonite (WS)41.840.320.311.7754.89
    下载: 导出CSV

    表  2  原料的混合比例

    Table  2.   Geopolymer mixture proportion

    NumberMK/gGGBFS/gWS/gAA/g
    M10000100
    M9-G90100100
    W/M8-G801010100
    W2/M7-G701020100
    W3/M6-G601030100
    W4/M5-G501040100
    Notes: MK and GGBFS were used as the matrix phase and WS as the reinforcing phase. They are denoted by M, G and W in the specimen numbering. As an example, 100 g AA (alkali activator), 50 g MK, 10 g GGBFS and 40 g WS are required to prepare W4/M5-G.
    下载: 导出CSV

    表  3  LF-NMR测得的地聚物孔隙度

    Table  3.   LF-NMR porosity of geopolymer samples

    Number Porosity/%
    M 31.05
    M9-G 27.91
    W/M8-G 27.29
    W2/M7-G 28.00
    W3/M6-G 28.29
    W4/M5-G 28.48
    下载: 导出CSV
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  • 收稿日期:  2022-08-31
  • 修回日期:  2022-10-25
  • 录用日期:  2022-11-03
  • 网络出版日期:  2022-11-10
  • 刊出日期:  2023-08-15

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