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混杂纤维增强砂浆高温后单轴受压本构关系

李黎 陶佳诚 曹明莉 李宗利

李黎, 陶佳诚, 曹明莉, 等. 混杂纤维增强砂浆高温后单轴受压本构关系[J]. 复合材料学报, 2022, 39(0): 1-11
引用本文: 李黎, 陶佳诚, 曹明莉, 等. 混杂纤维增强砂浆高温后单轴受压本构关系[J]. 复合材料学报, 2022, 39(0): 1-11
Li LI, Jiacheng TAO, Mingli CAO, Zongli LI. Constitutive relation of uniaxial compression of hybrid fiber reinforced mortar after high temperature[J]. Acta Materiae Compositae Sinica.
Citation: Li LI, Jiacheng TAO, Mingli CAO, Zongli LI. Constitutive relation of uniaxial compression of hybrid fiber reinforced mortar after high temperature[J]. Acta Materiae Compositae Sinica.

混杂纤维增强砂浆高温后单轴受压本构关系

基金项目: 陕西省自然科学基础研究计划项目 (2021JQ-174);中央高校基本科研业务费专项资金资助 (2452020054);国家自然科学基金 (52109168);国家重点研发计划(2017YFC0405101)
详细信息
    通讯作者:

    李宗利,博士,教授,博士生导师,研究方向为混凝土材料与结构 E-mail: bene@nwsuaf.edu.cn

  • 中图分类号: TB332

Constitutive relation of uniaxial compression of hybrid fiber reinforced mortar after high temperature

  • 摘要: 为建立高温和CaCO3晶须(CW)影响下混杂纤维增强砂浆(HyFRM) 的单轴受压本构关系,对不同CW掺量的钢-聚乙烯醇(PVA) HyFRM开展25、200、400、500、800、900℃六个温度水平的单轴受压性能试验。结果表明:随钢-PVA混杂纤维的引入,高温后砂浆的轴压峰值应力显著提高;随CW的引入,轴压峰值应力进一步提高:800℃以下,1.5vol%钢纤维+0.5vol%PVA纤维+2vol%CW的HyFRM轴压峰值应力均为最优。随温度升高,轴压应力应变曲线由陡峭趋于扁平,HyFRM轴压峰值应力、弹性模量、应变能总体下降。但500℃以下下降缓慢,甚至还有所提高,以1.5vol%钢纤维+0.5vol%PVA纤维+2vol%CW的HyFRM提高最为明显;800℃及以上,受压性能则急剧劣化。建立了考虑温度和CW掺量的HyFRM受压应力-应变损伤本构模型。损伤本构模型和损伤变量不仅可以较好地体现出多尺度纤维体系在砂浆单轴受压破坏的不同阶段多尺度阻裂、延缓砂浆损伤扩展的作用,而且可以反映高温对砂浆初始损伤的影响。光学显微镜和SEM观测揭示了高温对HyFRM轴压性能的影响机制。

     

  • 图  1  石英砂的筛分曲线

    Figure  1.  Grading curve of silica sand

    图  2  HyFRM高温后轴压峰值应力

    Figure  2.  Compressive peak stress of HyFRM after elevated temperature

    图  3  HyFRM高温后轴压应力-应变曲线

    Figure  3.  Compressive stress-strain curves of heated HyFRM after elevated temperature

    图  4  HyFRM高温后轴压应变能

    Figure  4.  Compressive strain energy of HyFRM after elevated temperature

    图  5  高温后HyFRM归一化轴压应力-应变实测曲线与理论曲线

    Figure  5.  Experimental and analytical normalized stress-strain curves of HyFRM after high temperatures

    图  6  不同温度后HyFRM损伤变量D

    Figure  6.  Damage variable D of HyFRM expose to different temperatures

    图  7  高温后不同配比HyFRM损伤变量D

    Figure  7.  Damage variable D of heated HyFRM with various fiber mixures after high temperatures

    图  8  SEM下HyFRM中水化产物的微观结构

    Figure  8.  Microstructures of hydration products in HyFRM under SEM

    图  9  光学显微镜下HyFRM高温后的微观结构

    Figure  9.  Microstructures of HyFRM after high temperatures under optical microscope

    图  10  SEM下HyFRM高温后的微观结构

    Figure  10.  Microstructures of HyFRM after high temperatures under SEM

    表  1  混杂纤维增强砂浆(HyFRM)原材料的基本性能

    Table  1.   Properties of raw materials of hybrid fiber reinforced mortar (HyFRM)

    Raw
    materials
    SizeMechanical property
    CementSpecific surface area 356 m2/kg28d cement mortar strength 46.5MPa
    Fly ash45 μm sieve residue 23.72wt%-
    Silica sandFineness modulus
    1.9 Media sand
    Moh’s hardness 7
    Steel fiberLength 13 mm
    Diameter 200 μm
    Tensile strength ≥2 GPa
    Elastic modulus 200-210 GPa
    PVA fiberLength 6 mm
    Diameter 31 μm
    Tensile strength 1.1 GPa
    Elastic modulus 41 GPa
    CWLength 20–30 μm
    Diameter0.5–2 μm
    Tensile strength 3–6 GPa
    Elastic modulus 410–710 GPa
    Notes: PVA—Polyvinyl alcohol; CW—CaCO3 whisker.
    下载: 导出CSV

    表  2  HyFRM的配合比(kg/m3)

    Table  2.   Mix ratios of HyFRM

    GroupSteel fiberPVA fiberCWBinderWaterSand
    M0001220366610
    1SF-0.5PVA/M1176.4501196359598
    1SF-0.5PVA-1CW/M1176.4528.61183355592
    1SF-0.5PVA-2CW/M1176.4557.21171351586
    Notes: M—Mortar; SF—Steel fiber; PVA—Polyvinyl alcohol fiber; CW—CaCO3 whisker.
    下载: 导出CSV

    表  3  高温后HyFRM的孔隙率

    Table  3.   Porosity of HyFRM after high temperatures

    GroupTemperature/℃Porosity 2–
    5000 nm/%
    Porosity <
    50 nm/%
    Porosity ≥
    50 nm/%
    1SF-0.5PVA/M2515.3010.324.98
    1SF-0.5PVA-2CW/M2516.5912.484.11
    1SF-0.5PVA-2CW/M20017.1011.665.34
    1SF-0.5PVA-2CW/M40016.8611.615.25
    1SF-0.5PVA-2CW/M90024.924.9919.93
    下载: 导出CSV
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出版历程
  • 收稿日期:  2021-09-22
  • 录用日期:  2021-12-07
  • 修回日期:  2021-11-24
  • 网络出版日期:  2022-01-10

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