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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, 40(0): 1-12
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, 40(0): 1-12
Yuliang CHEN, Hao LI, Peihuan YE, Zongping CHEN, Hongfei XU. Experimental study on mechanical behavior of steel fiber recycled concrete under cyclic compression[J]. Acta Materiae Compositae Sinica.
Citation: Yuliang CHEN, Hao LI, Peihuan YE, Zongping CHEN, Hongfei XU. Experimental study on mechanical behavior of steel fiber recycled concrete under cyclic compression[J]. Acta Materiae Compositae Sinica.

循环荷载作用下钢纤维再生混凝土力学性能试验

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资助(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-应变全曲线以及峰值应力、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1.0%时再生混凝土峰值应力降低了5.9%,峰值应变提高了20.2%,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  钢纤维外观特征

    Figure  1.  Appearance characteristics of steel fiber

    图  2  试验加载装置及加载制度

    Figure  2.  Loading device and loading procedure

    图  3  钢纤维再生混凝土试件破坏形态

    Figure  3.  Failure mode of steel fiber recycled concrete specimen

    图  4  钢纤维再生混凝土应力-应变全曲线

    Figure  4.  Stress-strain curves of steel fiber recycled concrete

    图  5  钢纤维再生混凝土循环受压全过程示意图

    Figure  5.  Diagram of steel fiber recycled concrete cyclic compression process

    图  6  钢纤维阻裂效果

    Figure  6.  Crack resistance effect of steel fiber

    图  7  再生骨料取代率对钢纤维再生混凝土峰值点的影响

    Figure  7.  Effect of recycled aggregate replacement ratio on peak point of steel fiber recycled concrete

    图  8  钢纤维体积分数对钢纤维再生混凝土峰值点的影响

    Figure  8.  Effect of steel fiber volume fraction on peak point of steel fiber recycled concrete

    图  9  加载速率对钢纤维再生混凝土峰值点的影响

    Figure  9.  Effect of loading rate on peak point of steel fiber recycled concrete

    图  10  钢纤维再生混凝土卸载点应变与塑性应变关系

    Figure  10.  Relationship between unloading point strain and plastic strain of steel fiber recycled concrete

    图  12  钢纤维再生混凝土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 steel fiber recycled concrete under cyclic compression

    图  11  钢纤维再生混凝土参数ab拟合结果

    Figure  11.  Parameters a, b fitting results of steel fiber recycled concrete

    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  钢纤维再生混凝土试件设计参数

    Table  2.   Design parameters of steel fiber recycled concrete specimens

    Specimen No.VSF/%r/%v/(mm·s−1)
    0%SF/RAC(0%)-0.005000.005
    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%)-0.00501000.005
    0%SF/RAC(100%)-0.00201000.002
    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;0%SF/RAC (0%)-0.005—0% steel fiber volume fraction,0% recycled aggregate replacement rate,the loading rate is 0.005mm/s.
    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/%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
    050021554211530045.1
    30500215542807.1345.97.543.8
    50500215542576.5576.512.538.3
    70500215542345.9807.117.535.5
    10050021554201153.025.038.2
    Notes:NA—Natural coarse aggregate;RA—Recycled coarse aggregate;fcu—Cube compressive strength.
    下载: 导出CSV
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  • 收稿日期:  2021-12-27
  • 录用日期:  2022-02-27
  • 修回日期:  2022-02-11
  • 网络出版日期:  2022-03-19

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