基于SHPB试验的碳纳米管增强混凝土动态压缩行为研究

夏伟 陆松 白二雷 赵德辉 许金余 杜宇航

夏伟, 陆松, 白二雷, 赵德辉, 许金余, 杜宇航. 基于SHPB试验的碳纳米管增强混凝土动态压缩行为研究[J]. 爆炸与冲击. doi: 10.11883/bzycj-2023-0424
引用本文: 夏伟, 陆松, 白二雷, 赵德辉, 许金余, 杜宇航. 基于SHPB试验的碳纳米管增强混凝土动态压缩行为研究[J]. 爆炸与冲击. doi: 10.11883/bzycj-2023-0424
XIA Wei, LU Song, BAI Erlei, ZHAO Dehui, XU Jinyu, DU Yuhang. A study of dynamic compression behavior of carbon nanotubes reinforced concrete based on SHPB test[J]. Explosion And Shock Waves. doi: 10.11883/bzycj-2023-0424
Citation: XIA Wei, LU Song, BAI Erlei, ZHAO Dehui, XU Jinyu, DU Yuhang. A study of dynamic compression behavior of carbon nanotubes reinforced concrete based on SHPB test[J]. Explosion And Shock Waves. doi: 10.11883/bzycj-2023-0424

基于SHPB试验的碳纳米管增强混凝土动态压缩行为研究

doi: 10.11883/bzycj-2023-0424
基金项目: 国家自然科学基金(51908548)
详细信息
    作者简介:

    夏 伟(1996- ),男,博士研究生,xiaweiafeu@163.com

    通讯作者:

    陆 松(1990- ),男,博士,讲师,lusong647@163.com

  • 中图分类号: O347.3; TU528.57

A study of dynamic compression behavior of carbon nanotubes reinforced concrete based on SHPB test

  • 摘要: 为探究碳纳米管增强混凝土在冲击荷载作用下的动态压缩行为,采用$\varnothing $100 mm大直径分离式霍普金森压杆(split Hopkinson pressure bar, SHPB)试验装置对其进行了冲击试验,对比分析了不同冲击速度和碳纳米管掺量条件下混凝土的动态抗压强度、受压变形以及能量耗散特征的演化规律。试验结果表明:碳纳米管增强混凝土的动态强度特性具有显著的加载速率敏感性,动态抗压强度和动态强度增长因子均与冲击速度呈正相关的线性关系,当加载水平相同时,动态抗压强度随碳纳米管掺量的增大呈先上升后略有下降的变化趋势,且与普通混凝土相比增幅可达23.7%。碳纳米管增强混凝土的极限应变与冲击韧度的变化特点相似,均随冲击速度的增大而逐渐提高,具有一定的冲击速度强化效应,但与冲击速度之间并没有表现出明显的线性关系。在同一加载水平下,当碳纳米管掺量为0.30%时,混凝土的冲击韧度达到相对最大,较之普通混凝土提升约10%。掺入适量的碳纳米管能够有效强化混凝土内部结构的整体性和致密性,进而改善混凝土的动态力学性能以及能量耗散特征。
  • 图  1  碳纳米管超声分散处理

    Figure  1.  Ultrasonic dispersion treatment of carbon nanotubes

    图  2  SHPB试验装置组成

    Figure  2.  Schematic diagram of a SHPB test device

    图  3  混凝土动态应力-应变曲线

    Figure  3.  Dynamic stress-strain curves of concrete

    图  4  混凝土动态压缩强度特性与冲击速度的关系

    Figure  4.  Relationship between concrete’s dynamic compressive strength characteristics and impact velocity

    图  5  混凝土动态受压变形与冲击速度的关系

    Figure  5.  Relationship between concrete’s dynamic compression deformation and impact velocity

    图  6  混凝土能量耗散特征与冲击速度的关系

    Figure  6.  Relationship between concrete’s energy dissipation characteristics and impact velocity

    表  1  水泥的化学组成(质量分数)

    Table  1.   Chemical composition of cement (mass fraction) %

    CaOSiO2Al2O3Fe2O3MgOSO3其他
    60.5421.744.234.612.882.453.55
    下载: 导出CSV

    表  2  碳纳米管的主要性能参数

    Table  2.   Main performance parameters of carbon nanotubes

    羧基含量(质量分数)/%纯度/%长度/μm直径/nm内径/nm振实密度/(g·cm−3)比表面积/(m2·g−1)
    3.86>950.5~25~152~50.27>200
    下载: 导出CSV

    表  3  混凝土的配合比

    Table  3.   Mix proportion of concrete kg/m3

    试样编号 水泥 河砂 碎石 减水剂 消泡剂 碳纳米管
    PC 340 640 1360 130 1.7 0.2 0
    CNRC1 340 640 1360 130 1.7 0.2 0.34
    CNRC2 340 640 1360 130 1.7 0.2 0.68
    CNRC3 340 640 1360 130 1.7 0.2 1.02
    CNRC4 340 640 1360 130 1.7 0.2 1.36
     注:PC表示未掺加碳纳米管的普通混凝土,CNRC1表示碳纳米管掺量为0.1%的碳纳米管增强混凝土,其余编号代表的含义以此类推。
    下载: 导出CSV

    表  4  混凝土动态抗压强度与冲击速度的拟合结果

    Table  4.   Fitting results between concrete’s dynamic compressive strength and impact velocity

    拟合参数 PC CNRC1 CNRC2 CNRC3 CNRC4
    k 7.11 6.64 7.83 5.06 7.39
    b 2.59 6.12 −0.11 27.69 0.83
    R2 0.9654 0.9663 0.9968 0.9753 0.9751
    下载: 导出CSV

    表  5  混凝土动态强度增长因子与冲击速度的拟合结果

    Table  5.   Fitting results between concrete’s dynamic enhancement factor and impact velocity

    拟合参数 PC CNRC1 CNRC2 CNRC3 CNRC4
    k 0.143 0.131 0.152 0.092 0.156
    b 0.067 0.123 −6.026 0.508 0.020
    R2 0.9657 0.9717 0.9946 0.9729 0.9783
    下载: 导出CSV
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  • 收稿日期:  2023-11-27
  • 修回日期:  2024-01-25
  • 网络出版日期:  2024-02-29

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