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中高温及低温作用后超高韧性水泥基复合材料的力学性能

钱维民 苏骏 史庆轩 李扬 嵇威

钱维民, 苏骏, 史庆轩, 等. 中高温及低温作用后超高韧性水泥基复合材料的力学性能[J]. 复合材料学报, 2024, 41(4): 2014-2030. doi: 10.13801/j.cnki.fhclxb.20230811.001
引用本文: 钱维民, 苏骏, 史庆轩, 等. 中高温及低温作用后超高韧性水泥基复合材料的力学性能[J]. 复合材料学报, 2024, 41(4): 2014-2030. doi: 10.13801/j.cnki.fhclxb.20230811.001
QIAN Weimin, SU Jun, SHI Qingxuan, et al. Study on mechanical properties of ultra-high toughness cementitious composites after medium-high temperature and low temperature[J]. Acta Materiae Compositae Sinica, 2024, 41(4): 2014-2030. doi: 10.13801/j.cnki.fhclxb.20230811.001
Citation: QIAN Weimin, SU Jun, SHI Qingxuan, et al. Study on mechanical properties of ultra-high toughness cementitious composites after medium-high temperature and low temperature[J]. Acta Materiae Compositae Sinica, 2024, 41(4): 2014-2030. doi: 10.13801/j.cnki.fhclxb.20230811.001

中高温及低温作用后超高韧性水泥基复合材料的力学性能

doi: 10.13801/j.cnki.fhclxb.20230811.001
基金项目: 国家自然科学基金(52178505;51878540);湖北省自然科学基金(2020CFB860)
详细信息
    通讯作者:

    苏骏,博士,教授,硕士生导师,研究方向为纤维混凝土及工程结构抗震 E-mail: sujun930@163.com

  • 中图分类号: TB332

Study on mechanical properties of ultra-high toughness cementitious composites after medium-high temperature and low temperature

Funds: National Natural Science Foundation of China (52178505; 51878540); Natural Science Foundation of Hubei Province of China (2020CFB860)
  • 摘要: 为研究超高韧性水泥基复合材料(UHTCC)在200~−100℃温度作用后的力学性能,设计了不同纤维体积掺量的UHTCC,经中高温和低温作用后进行基本力学性能试验,通过UHTCC强度和变形等参数评价了中高温和低温作用后UHTCC的力学性能。结果表明:纤维的掺入能有效改善基体的脆性,提升材料的韧性;同时温度作用导致材料内部出现初始缺陷,对UHTCC的力学性能有明显的影响,且低温作用的影响要明显高于高温作用,当温度降低至−100℃时,UHTCC强度最大降低约75%,变形最大降低约92%,但温度作用未对UHTCC的泊松比产生明显影响。在此基础上提出了中高温及低温作用后UHTCC轴压和轴拉应力-应变关系回归模型,为UHTCC材料在极端温度环境下的性能设计和工程应用提供参考。

     

  • 图  1  试件尺寸与纤维形态

    Figure  1.  Specimen size and fiber morphology

    PVA—Polyvinyl alcohol

    图  2  极端温度设备

    Figure  2.  Extreme temperature equipment

    图  3  加载装置示意图

    Figure  3.  Sketches of the test setup

    图  4  试件抗压破坏形态

    Figure  4.  Compressive failure mode of specimens

    UHTCC—Ultra high toughness cementitious composites

    图  5  UHTCC抗压强度和强度损失率

    Figure  5.  Compressive strength and strength loss ratio of UHTCC

    图  6  试件劈拉试验破坏形态

    Figure  6.  Specimen splitting tensile failure mode

    图  7  UHTCC劈拉强度和强度损失率

    Figure  7.  Splitting tensile strength and strength loss ratio of UHTCC

    图  8  不同影响因素下UHTCC应力-应变曲线

    Figure  8.  UHTCC stress-strain curves under different influencing factors

    图  9  UHTCC抗压强度与轴压强度转换系数

    Figure  9.  UHTCC compression strength and axial compression strength conversion coefficient

    图  10  UHTCC泊松比

    Figure  10.  Poisson’s ratio of UHTCC

    图  11  UHTCC弹性模量

    Figure  11.  Elastic modulus of UHTCC

    图  12  UHTCC修正弹性模量计算值与试验值对比

    Figure  12.  Comparison of calculated and experimental values of UHTCC modified elastic modulus

    图  13  UHTCC破坏形态

    Figure  13.  Fracture morphology of UHTCC

    图  14  UHTCC应力-应变曲线

    Figure  14.  Stress-strain curves of UHTCC

    图  15  不同影响因素下UHTCC峰值应力、峰值应变的试验值与计算值

    Figure  15.  Experimental and calculated values of peak stress and peak strain of UHTCC under different influencing factors

    图  16  UHTCC受压计算模型与试验值对比

    Figure  16.  Comparison between UHTCC compression calculation model and experimental values

    ECC—Engineered cementitious composites

    图  17  UHTCC受拉应力和应变

    Figure  17.  Tensile stress and strain of UHTCC

    图  18  UHTCC试验曲线与计算曲线对比

    Figure  18.  Comparison of test curves and calculation curves of UHTCC

    图  19  混凝土的热应变行为[29]

    Figure  19.  Cooling-heating thermal strain behavior of concrete[29]

    图  20  UHTCC低温损伤演化示意图

    Figure  20.  Cryogenic temperatures damage evolution of UHTCC

    图  21  UHTCC高温损伤示意图

    Figure  21.  High temperature damage diagram of UHTCC

    图  22  UHTCC的SEM图像

    Figure  22.  SEM images of UHTCC

    C-S-H—Hydrate calcium silicate

    表  1  水泥、粉煤灰和硅灰的物理化学性质

    Table  1.   Physical and chemical properties of cement, fly ash and silica fume

    BinderConstituent mass fraction/wt%Specific surface area/(cm2·g−1)Density/(g·cm−3)
    CaOAl2O3SiO2Fe2O3MgOSO3
    Cement 64.94 4.50 19.58 3.20 2.14 3.06 3413 3.15
    Fly ash 2.44 30.63 48.74 2.61 1.21 1.02 8000 1.90
    Silica fume 4.32 0.42 93.52 0.18 0.34 0.15 200000 2.20
    下载: 导出CSV

    表  2  材料配比

    Table  2.   Ratio of materials

    Fly ash/(kg·m−3)Cement/(kg·m−3)Sand/(kg·m−3)Silica fume/(kg·m−3)Water/(kg·m−3)Water reducer/(kg·m−3)Fiber content/vol%
    811.6493.0386.713.3313.14.20, 0.5, 1.0, 1.5, 2.0
    下载: 导出CSV

    表  3  聚乙烯醇(PVA)纤维性能指标

    Table  3.   Polyvinyl alcohol (PVA) fiber performance index

    ModelDensity/(g·cm−3)Diameter/mmLength/mmElastic modulus/GPaTensile strength/MPaElongation/%
    REC15×121.30.041242.816206
    下载: 导出CSV

    表  4  UHTCC强度转换系数α

    Table  4.   Strength conversion coefficient α of UHTCC

    T/℃ α
    200 0.73
    100 0.73
    20 0.77
    −25 0.76
    −50 0.74
    −75 0.74
    −100 0.76
    Note: T—Temperature.
    下载: 导出CSV
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出版历程
  • 收稿日期:  2023-06-05
  • 修回日期:  2023-07-18
  • 录用日期:  2023-07-31
  • 网络出版日期:  2023-08-14
  • 刊出日期:  2024-04-15

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