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多组合混杂纤维改性再生混凝土循环受压性能试验

陈宇良 王琦 梁鑫 陆大敏

陈宇良, 王琦, 梁鑫, 等. 多组合混杂纤维改性再生混凝土循环受压性能试验[J]. 复合材料学报, 2023, 40(8): 4745-4756. doi: 10.13801/j.cnki.fhclxb.20221024.004
引用本文: 陈宇良, 王琦, 梁鑫, 等. 多组合混杂纤维改性再生混凝土循环受压性能试验[J]. 复合材料学报, 2023, 40(8): 4745-4756. doi: 10.13801/j.cnki.fhclxb.20221024.004
CHEN Yuliang, WANG Qi, LIANG Xin, et al. Effect of multi-composite hybrid fiber on cyclic compression performance of recycled concrete[J]. Acta Materiae Compositae Sinica, 2023, 40(8): 4745-4756. doi: 10.13801/j.cnki.fhclxb.20221024.004
Citation: CHEN Yuliang, WANG Qi, LIANG Xin, et al. Effect of multi-composite hybrid fiber on cyclic compression performance of recycled concrete[J]. Acta Materiae Compositae Sinica, 2023, 40(8): 4745-4756. doi: 10.13801/j.cnki.fhclxb.20221024.004

多组合混杂纤维改性再生混凝土循环受压性能试验

doi: 10.13801/j.cnki.fhclxb.20221024.004
基金项目: 中国博士后科学基金(2021M693854);广西自然科学基金(2019GXNSFBA245030);广西科技大学博士基金项目(校科博18Z09)
详细信息
    通讯作者:

    陈宇良,博士,副教授,硕士生导师,研究方向为再生混凝土结构、钢-混凝土组合结构 E-mail: ylchen@gxust.edu.cn

  • 中图分类号: TU528;TB333

Effect of multi-composite hybrid fiber on cyclic compression performance of recycled concrete

Funds: Postdoctoral Science Foundation of China (2021M693854); Guangxi Natural Science Foundation Program (2019GXNSFBA245030); Doctoral Foundation of Guangxi University of Science and Technology (18Z09)
  • 摘要: 为研究多组合混杂纤维对再生混凝土(HFRAC)循环受压性能的影响规律,对84个试件进行单调受压试验和单调循环受压试验,分析了钢-碳纤维(SF-CF)、钢-玻璃纤维(SF-GF)、钢-聚丙烯纤维(SF-PF)和钢-聚乙烯醇纤维(SF-PVA) 4种纤维组合和纤维体积掺量对循环受压性能的影响。结果表明:与普通再生混凝土相比,HFRAC的破坏形态为延性破坏;各组HFRAC试件在循环受压下的应力-应变曲线包络线与单调受压应力-应变曲线近似一致;与钢纤维再生混凝土相比,SF-GF混杂纤维和SF-PVA混杂纤维对塑性应变累积的抑制效果更好;掺入弹性模量较大的SF-CF混杂纤维对再生混凝土刚度退化率的增加和滞回耗能能力提高有显著作用,掺入1.0vol%SF+0.5vol%CF时再生混凝土的刚度退化率增加了43.4%。最后,在试验结果的基础上,建立了HFRAC单轴循环受压应力-应变关系全曲线方程,计算结果与试验结果吻合良好。

     

  • 图  1  纤维外观特征

    SF—Steel fiber; PF—Polypropylene fiber; CF—Carbon fiber; PVA—Polyvinyl alcohol fiber; GF—Glass fiber

    Figure  1.  Appearance characteristics of fiber

    图  2  试验加载装置及加载制度

    LVDT—Linear variable displacement transducer

    Figure  2.  Loading device and loading procedure

    图  3  混杂纤维改性再生混凝土(HFRAC)试件的典型破坏图

    Figure  3.  Typical damage figure of the hybrid fiber reinforced recycled concrete (HFRAC) specimen

    图  4  HFRAC单轴循环受压全过程

    Figure  4.  Whole process of HFRAC uniaxial cycle compression

    图  5  典型的HFRAC循环荷载受压应力(σ)-应变(ε)全曲线

    Figure  5.  Typical cyclic compressive stress (σ)-strain (ε) curves of HFRAC specimens

    图  6  HFRAC卸载点应变与塑性应变关系

    Figure  6.  Relationship curves between plastic strain and unloading point strain of HFRAC

    图  7  HFRAC刚度退化率(Eunl/E0)与循环次数的关系曲线

    Figure  7.  Relationship curves between stiffness ratio (Eunl/E0) and cycle number of HFRAC

    图  8  HFRAC的滞回耗散能量

    Figure  8.  Hysteretic energy consumption of HFRAC

    图  9  纤维的微观视角

    Figure  9.  Microscopic view of fiber

    图  10  ab计算值和建议值对比

    Figure  10.  Comparison of the calculated values and the suggested values of a, b

    图  11  HFRAC循环本构关系模型验证

    Figure  11.  Verification of the HFRAC cycle constitutive relationship model

    表  1  粗骨料(RCA)的物理性能

    Table  1.   Basic properties of natural and recycled coarse aggregates (RCA)

    PropertyApparent density/(kg·m–3)Bulk density/(kg·m–3)Water absorption/%Crushing index/%
    Value258013215.3525.63
    下载: 导出CSV

    表  2  纤维的物理和力学性能

    Table  2.   Physical and mechanical properties for fibers

    Parameterlf/mmdf/mmAspect ratio
    lf/df
    Density/(g·cm−3)Tensile strength/MPaElastic modulus
    /GPa
    Stripped corrugated steel fiber (SF)350.58607.80≥1150200
    Carbon fiber (CF)150.072141.76≥3000205
    Glass fiber (GF)150.0115000.91350-40095
    Polyvinyl alcohol fiber (PVA)170.044501.291800-190040
    Polypropylene fiber (PF)140.034000.91500-6004.09
    Notes: lf—Length of the fiber; df—Diameter of the fiber.
    下载: 导出CSV

    表  3  混凝土的配合比

    Table  3.   Concrete matrix mix proportion

    Strength
    grade
    Water-binder ratio
    w/c
    Sediment
    charge/%
    Recycled coarse aggregate
    replacement rate/%
    Material amount/(kg·m−3)
    CementWaterAdditional waterSandCoarse aggregate
    C350.4132100500254.825.05421153
    下载: 导出CSV
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出版历程
  • 收稿日期:  2022-08-18
  • 修回日期:  2022-09-20
  • 录用日期:  2022-10-15
  • 网络出版日期:  2022-10-24
  • 刊出日期:  2023-08-15

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