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基于核磁共振技术的玄武岩-聚丙烯混杂纤维增强混凝土孔隙特征分析

黄观送 苏丽 薛翠真 朱翔琛 付勇 叶付凯 乔宏霞

黄观送, 苏丽, 薛翠真, 等. 基于核磁共振技术的玄武岩-聚丙烯混杂纤维增强混凝土孔隙特征分析[J]. 复合材料学报, 2024, 42(0): 1-15.
引用本文: 黄观送, 苏丽, 薛翠真, 等. 基于核磁共振技术的玄武岩-聚丙烯混杂纤维增强混凝土孔隙特征分析[J]. 复合材料学报, 2024, 42(0): 1-15.
HUANG Guansong, SU Li, XUE Cuizhen, et al. Analysis on pore characteristics of hybrid basalt-polypropylene fiber-reinforced concrete based on nuclear magnetic resonance technology[J]. Acta Materiae Compositae Sinica.
Citation: HUANG Guansong, SU Li, XUE Cuizhen, et al. Analysis on pore characteristics of hybrid basalt-polypropylene fiber-reinforced concrete based on nuclear magnetic resonance technology[J]. Acta Materiae Compositae Sinica.

基于核磁共振技术的玄武岩-聚丙烯混杂纤维增强混凝土孔隙特征分析

基金项目: 国家自然科学基金(U21A20150);甘肃省青年科学基金(23JRRA824);甘肃省科技计划资助(23JRRA813)
详细信息
    通讯作者:

    苏丽,博士,副教授,硕士生导师,研究方向为混凝土耐久性 E-mail: suli_0527@163.com

  • 中图分类号: TU528.1

Analysis on pore characteristics of hybrid basalt-polypropylene fiber-reinforced concrete based on nuclear magnetic resonance technology

Funds: National Natural Science Foundation of China (U21A20150); Youth Science and Technology Foundation of Gansu Province (23JRRA824); Gansu Provincial Science and Technology Programme Grants (23JRRA813)
  • 摘要: 采用核磁共振(Nuclear Magnetic Resonance,NMR)测试了玄武岩-聚丙烯混杂纤维混凝土(HBPRC)的孔隙特征,对比分析了玄武岩纤维(BF)和聚丙烯纤维(PF)以及二者混杂对HBPRC的抗压强度、孔隙率、孔径分布和曲折度的影响,并基于核磁共振T2谱和孔隙结构分形理论对4个孔径区域的孔隙结构分形维数进行了量化。结果表明:随着BF的添加,T2谱反映出适量的BF可以减小混凝土的孔隙率,而且有利于减小大孔体积占比;而随着PF含量增加,T2谱面积增加,且混凝土内部孔隙有变大的趋势。掺入BF-PF混杂纤维对混凝土的孔隙特征会产生正协同作用,当BF和PF掺量均为0.05%时,协同作用最佳,与普通混凝土相比,抗压强度提高了3.52%、孔隙率降低了1.47%、曲折度提高了8.20%。凝胶孔体积占比增大了8.76%,大孔体积占比降低了5.30%,孔径分布得到优化。HBPRC的孔隙结构具有明显的分形特征,孔隙结构分形维数在过渡孔、毛细孔和大孔区域依次增加,此外,分形维数越大,抗压强度越大。通过微观分析认为,纤维在混凝土基体中的粘结状态和分布是影响HBPRC孔隙分形特征的主要原因。

     

  • 图  1  BF和PF外观形貌

    Figure  1.  Morphology of BF and PF

    图  2  MesoMR12-060H-I 岩石微观孔隙结构分析与成像系统

    Figure  2.  MesoMR12-060H-I Rock microscopic pore structure analysis and imaging system

    图  3  核磁共振试验样品制备

    Figure  3.  Preparation of the NMR samples

    图  4  抗压试件破坏形态

    Figure  4.  Failure modes of compression specimen

    图  5  28 d HBPRC抗压强度

    Figure  5.  Compressive strength test results of 28 d HBPRC

    图  6  (a) PF断裂形貌;(b) 纤维搭接;(c) BF-PF三维纤维网

    Figure  6.  (a) PF fracture morphology; (b) Fibers overlap; (c) Three-dimensional bearing fiber mesh of BF-PF

    图  7  单掺BF试件横向弛豫时间分布

    Figure  7.  Transverse relaxation-time distribution of single doped BF specimen

    图  8  单掺PF试件弛豫时间分布

    Figure  8.  Transverse relaxation-time distribution of single doped PF specimen

    图  9  HBPRC横向弛豫时间分布

    Figure  9.  Transverse relaxation-time distribution of HBPRC

    图  10  HBPRC的孔隙率

    Figure  10.  Porosity of HBPRC

    图  11  HBPRC的孔径分布

    Figure  11.  Pore size distribution of HBPRC

    图  12  HBPRC的曲折度

    Figure  12.  Tortuosity of HBPRC

    图  13  HBPRC横向弛豫时间与分形特征的关系

    Figure  13.  Relationship between transverse relaxation time and fractal characteristics of HBPRC

    图  14  不同孔隙的HBPRC的孔隙结构分形维数

    Figure  14.  Fractal dimension of pore structure of HBPRC with different pores

    图  15  纤维与混凝土基体粘结

    Figure  15.  Bonding between fibers and concrete matrix

    图  16  纤维在HBPRC中的分布

    Figure  16.  Distribution of fibers in HBPRC

    图  17  HBPRC抗压强度与孔隙结构分形维数的关系

    Figure  17.  Relationship between compressive strength and fractal dimension of pore structure of HBPRC

    表  1  胶凝材料和BF化学组成(wt%)

    Table  1.   Chemical composition of cementitious materials and BF (wt%)

    Composition SiO2 Al2O3 Fe2O3 CaO MgO
    Cement 34.67 7.90 2.93 35.5 1.77
    Fly Ash 50.77 22.68 5.64 5.98 1.74
    BF 51.4 15.4 9.8 9 5.7
    下载: 导出CSV

    表  2  BF和PF的物理力学性能

    Table  2.   Physical and mechanical of BF and PF

    Type Density/(kg·m−3) Tensile Strength/MPa Elastic Modulus/GPa Diameter/μm Length/mm
    BF 2.65 ≥2400 ≥40 15 18
    PF 0.91 270 0.3 30 19
    下载: 导出CSV

    表  3  玄武岩-聚丙烯混杂纤维混凝土(HBPRC)配合比

    Table  3.   Mix proportions of hybrid basalt-polypropylene fiber-reinforced concrete (HBPRC)

    Mixtures Mixture composition/(kg·m−3)
    C W CA S FA PBS BF PF
    BF0PF0 320 160 1068 712 100 6.3 0 0
    BF0.05PF0 320 160 1068 712 100 6.3 1.3 0
    BF0.1PF0 320 160 1068 712 100 6.3 2.6 0
    BF0PF0.05 320 160 1068 712 100 6.3 0 0.5
    BF0PF0.1 320 160 1068 712 100 6.3 0 0.9
    BF0.05PF0.05 320 160 1068 712 100 6.3 1.3 0.5
    BF0.1PF0.05 320 160 1068 712 100 6.3 2.6 0.5
    BF0.05PF0.1 320 160 1068 712 100 6.3 1.3 0.9
    BF0.1PF0.1 320 160 1068 712 100 6.3 2.6 0.9
    Notes: "C" refers to cement, "W" refers to water, "CA" refers to coarse aggregate, "S" refers to river sand, "FA" refers to fly ash, "PBS" refers to performance water reducer, "BF" refers to basalt fiber, "PF" refers to polypropylene fiber, "0", "0.05", "0.1" represent the fiber volume content of 0%, 0.05%, 0.1%, respectively
    下载: 导出CSV

    表  4  HBPRC的横向弛豫T2谱峰面积比例

    Table  4.   Transverse relaxation-time T2 spectral peak area percentage of HBPRC

    Mixtures Peak 1/% Peak 2/% Peak 3/% Peak 4/%
    BF0PF0 62.60 13.91 10.18 13.28
    BF0.05PF0 72.54 11.55 8.70 7.19
    BF0.1PF0 61.79 13.66 10.07 14.46
    BF0PF0.05 51.43 13.69 12.42 22.44
    BF0PF0.1 56.05 13.77 10.25 19.92
    BF0.05PF0.05 69.48 12.72 10.97 6.81
    BF0.1PF0.05 64.08 13.52 9.44 12.94
    BF0.05PF0.1 55.91 15.72 10.96 17.39
    BF0.1PF0.1 65.80 14.44 12.14 7.60
    下载: 导出CSV
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出版历程
  • 收稿日期:  2024-03-18
  • 修回日期:  2024-04-29
  • 录用日期:  2024-05-09
  • 网络出版日期:  2024-06-12

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