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循环荷载作用下钢纤维再生混凝土力学性能试验

陈宇良 李浩 叶培欢 陈宗平 徐鸿飞

陈宇良, 李浩, 叶培欢, 等. 循环荷载作用下钢纤维再生混凝土力学性能试验[J]. 复合材料学报, 2022, 39(11): 5574-5585. doi: 10.13801/j.cnki.fhclxb.20220310.002
引用本文: 陈宇良, 李浩, 叶培欢, 等. 循环荷载作用下钢纤维再生混凝土力学性能试验[J]. 复合材料学报, 2022, 39(11): 5574-5585. doi: 10.13801/j.cnki.fhclxb.20220310.002
CHEN Yuliang, LI Hao, YE Peihuan, et al. Experimental study on mechanical behavior of steel fiber recycled concrete under cyclic compression[J]. Acta Materiae Compositae Sinica, 2022, 39(11): 5574-5585. doi: 10.13801/j.cnki.fhclxb.20220310.002
Citation: CHEN Yuliang, LI Hao, YE Peihuan, et al. Experimental study on mechanical behavior of steel fiber recycled concrete under cyclic compression[J]. Acta Materiae Compositae Sinica, 2022, 39(11): 5574-5585. doi: 10.13801/j.cnki.fhclxb.20220310.002

循环荷载作用下钢纤维再生混凝土力学性能试验

doi: 10.13801/j.cnki.fhclxb.20220310.002
基金项目: 国家自然科学基金(51908141);中国博士后科学基金(2021M693854);广西重点实验室开放课题项目(2019ZDK038);广西科技大学博士基金项目(校科博18Z09);柳州欧维姆机械股份有限公司博士后科研工作站科研项目(202123)
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

Experimental study on mechanical behavior of steel fiber recycled concrete under cyclic compression

  • 摘要: 为研究钢纤维再生混凝土在地震荷载作用下的力学行为,考虑了再生粗骨料取代率、钢纤维体积分数和加载速率3个变化参数,设计了52个圆柱体试件进行单轴循环受压试验。试验观察了钢纤维再生混凝土的破坏形态,获取了应力-应变全曲线及峰值应力、峰值应变、塑性应变等重要指标,深入分析了不同变化参数对其力学性能指标的影响规律。结果表明:循环荷载作用下钢纤维再生混凝土主要发生斜向劈裂破坏,随着钢纤维体积分数的增加,试件表面主裂缝宽度明显减小;钢纤维的掺入提高了再生混凝土的峰值应变和残余强度,但峰值应力有所下降;钢纤维体积分数为1.0vol%时再生混凝土峰值应力降低最小为5.9%,峰值应变增幅最大为15.9%,改性效果最好;采用了幂函数对归一化塑性应变与卸载点应变的关系进行了拟合,效果良好。最后,提出了钢纤维再生混凝土在循环受压作用下的应力-应变本构关系计算式。

     

  • 图  1  钢纤维(SF)外观特征

    Figure  1.  Appearance characteristics of steel fiber (SF)

    图  2  试验加载装置及加载制度

    Figure  2.  Loading device and loading procedure

    图  3  SF/RAC试件破坏形态

    Figure  3.  Failure mode of SF/RAC specimen

    图  4  SF/RAC应力-应变曲线

    Figure  4.  Stress-strain curves of SF/RAC

    图  5  SF/RAC循环受压全过程示意图

    A-K—Characteristic point on the stress-strain curve

    Figure  5.  Diagram of SF/RAC cyclic compression process

    图  6  钢纤维(SF)阻裂效果

    Figure  6.  Crack resistance effect of steel fiber (SF)

    图  7  再生骨料取代率对SF/RAC峰值点的影响

    Figure  7.  Effect of recycled aggregate replacement ratio on peak point of SF/RAC

    图  8  钢纤维体积分数对SF/RAC峰值点的影响

    Figure  8.  Effect of steel fiber volume fraction on peak point of SF/RAC

    图  9  加载速率对SF/RAC峰值点的影响

    Figure  9.  Effect of loading rate on peak point of SF/RAC

    图  10  SF/RAC卸载点应变与塑性应变关系

    Figure  10.  Relationship between unloading point strain and plastic strain of SF/RAC

    图  12  SF/RAC循环受压计算曲线与试验曲线对比

    Figure  12.  Comparison of calculated curve and experimental curve of SF/RAC under cyclic compression

    图  11  SF/RAC参数ab拟合结果

    Figure  11.  Parameters a and b fitting results of SF/RAC

    表  1  粗骨料的物理性能

    Table  1.   Properties of coarse aggregates

    AggregateApparent density/(kg·m−3)Bulk density/(kg·m−3)Water absorption/%Crushing index/%Size/mm
    NA270414990.4317.25-20
    RA229613215.4025.65-20
    Notes: NA—Natural coarse aggregate; RA—Recycled coarse aggregate.
    下载: 导出CSV

    表  2  钢纤维再生混凝土(SF/RAC)试件设计参数

    Table  2.   Design parameters of steel fiber recycled aggregate concrete (SF/RAC) specimens

    SpecimenVSF/vol%r/wt%v/(mm·s−1)
    0%SF/RAC(0%)-0.0050.000.005
    1.0%SF/RAC(0%)-0.0051.000.005
    1.0%SF/RAC(30%)-0.0051.0300.005
    1.0%SF/RAC(50%)-0.0051.0500.005
    1.0%SF/RAC(70%)-0.0051.0700.005
    0%SF/RAC(100%)-0.0050.01000.005
    0%SF/RAC(100%)-0.0020.01000.002
    0.5%SF/RAC(100%)-0.0050.51000.005
    0.5%SF/RAC(100%)-0.0020.51000.002
    1.0%SF/RAC(100%)-0.0051.01000.005
    1.0%SF/RAC(100%)-0.0021.01000.002
    1.5%SF/RAC(100%)-0.0051.51000.005
    1.5%SF/RAC(100%)-0.0021.51000.002
    Notes: r—Replacement rate of recycled aggregate; VSF—Steel fiber volume fraction; v—Loading rate.
    下载: 导出CSV

    表  3  再生混凝土配合比及强度

    Table  3.   Mix proportion and strength of recycled aggregate concrete

    r/wt%Cement/(kg·m−3)Water/(kg·m−3)Sand/(kg·m−3)NA/(kg·m−3)RA/(kg·m−3)Additional water/(kg·m−3)fcu/MPa
    05002155421153.00.00.045.1
    30500215542807.1345.97.543.8
    50500215542576.5576.512.538.3
    70500215542345.9807.117.535.5
    1005002155420.01153.025.038.2
    Note: fcu—Cube compressive strength.
    下载: 导出CSV
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  • 收稿日期:  2021-12-27
  • 修回日期:  2022-02-11
  • 录用日期:  2022-02-27
  • 网络出版日期:  2022-03-15
  • 刊出日期:  2022-11-01

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