CF/SSF增强珊瑚砂水泥砂浆微观结构分析及动态劈裂拉伸试验研究

郭瑞奇 李江南 马林建 欧灿 许鑫

郭瑞奇, 李江南, 马林建, 欧灿, 许鑫. CF/SSF增强珊瑚砂水泥砂浆微观结构分析及动态劈裂拉伸试验研究[J]. 爆炸与冲击. doi: 10.11883/bzycj-2-23-0466
引用本文: 郭瑞奇, 李江南, 马林建, 欧灿, 许鑫. CF/SSF增强珊瑚砂水泥砂浆微观结构分析及动态劈裂拉伸试验研究[J]. 爆炸与冲击. doi: 10.11883/bzycj-2-23-0466
GUO Ruiqi, LI Jiangnan, MA Linjian, OU Can, XU Xin. Microstructure and dynamic splitting tensile properties of CF/SSF reinforced coral sand cement mortar[J]. Explosion And Shock Waves. doi: 10.11883/bzycj-2-23-0466
Citation: GUO Ruiqi, LI Jiangnan, MA Linjian, OU Can, XU Xin. Microstructure and dynamic splitting tensile properties of CF/SSF reinforced coral sand cement mortar[J]. Explosion And Shock Waves. doi: 10.11883/bzycj-2-23-0466

CF/SSF增强珊瑚砂水泥砂浆微观结构分析及动态劈裂拉伸试验研究

doi: 10.11883/bzycj-2-23-0466
基金项目: 湖南省自然科学基金(2023JJ40610, 2023JJ30569);湖南省教育厅优秀青年项目(23B0124);湖南省研究生科研创新项目(QL20230162)
详细信息
    作者简介:

    郭瑞奇(1993- ),男,博士,讲师,grq@xtu.edu.cn

    通讯作者:

    马林建(1984- ),男,博士,教授,patton.4400@163.com

  • 中图分类号: O347. 3;TU377

Microstructure and dynamic splitting tensile properties of CF/SSF reinforced coral sand cement mortar

  • 摘要: 珊瑚混凝土是一种拉压强度严重不对称的材料,研究其动态拉伸力学性能对岛礁防护工程具有重要意义。为了探究碳纤维(carbon fiber, CF)和不锈钢纤维(stainless steel fiber, SSF)增强珊瑚砂水泥砂浆在冲击荷载作用下的动态拉伸力学性能,采用ø100 mm的分离式霍普金森压杆(split Hopkinson pressure bar, SHPB)装置进行动态劈裂试验,对比分析不同纤维掺量的珊瑚砂水泥砂浆在不同应变率下的动态抗拉强度和能量耗散规律,并结合扫描电镜测试揭示混杂纤维的作用机理。结果表明:复掺CF与SSF的珊瑚砂水泥砂浆试样的静、动态抗拉强度都有明显的提高,最大动态抗拉强度增长率为66.03%。在相同应变率下,试样的动态抗拉强度与纤维掺量呈正相关,其破碎程度与纤维掺量呈负相关,纤维的桥接作用对试样裂缝开展具有良好的抑制效果。在同一纤维掺量下,动态增长因子随应变率的升高明显增大,动态增长因子最大值为2.44,表现出明显的拉伸应变率效应。珊瑚砂水泥砂浆试样的破碎程度及耗散能量均与应变率呈正相关,且纤维掺量越高,试样破坏时需要耗散的能量越多。
  • 图  1  SHPB设备示意图

    Figure  1.  Schematic diagram of SHPB device

    图  2  静态劈裂破坏形态

    Figure  2.  Static splitting failure morphology

    图  3  水化产物微观形貌

    Figure  3.  Microscopic morphology of hydration products

    图  4  不同放大倍率下纤维的断面SEM图像

    Figure  4.  SEM images of fiber cross-sections at different magnifications

    图  5  水泥砂浆动态劈裂试样动态平衡曲线

    Figure  5.  Dynamic equilibrium curves of cement mortar dynamic splitting specimen

    图  6  水泥砂浆试样破坏形态

    Figure  6.  Failure morphology of cement mortar specimens

    图  7  应变率与峰值应力和动态增长因子的关系

    Figure  7.  Relationships between peak stress, dynamic increase factor, and strain rate

    图  8  不同应变率下劈裂拉伸的能量时程曲线

    Figure  8.  Time history curves of splitting tensile energy under different strain rates

    图  9  入射能量、反射能量、吸收能量与应变率关系

    Figure  9.  Relationships between incident energy, reflected energy, absorbed energy, and strain rate

    表  1  水泥、粉煤灰和硅灰的化学成分

    Table  1.   Chemical composition of cement, fly ash, and silica fume

    组分 质量分数/%
    CaO Al2O3 SiO2 Fe2O3 MgO SO3
    水泥 51.42 8.26 24.99 4.03 3.71 2.51
    粉煤灰 5.60 30.14 50.26 4.16 2.16
    硅灰 0.11 0.32 96.74 0.08 0.10
    下载: 导出CSV

    表  2  碳纤维和316L不锈钢纤维的基本性能参数

    Table  2.   Basic performance parameters of carbon and 316L stainless steel fibers

    种类 长度/
    mm
    直径/
    μm
    抗拉强度/
    MPa
    密度/
    (g·cm−3)
    伸长率/%
    CF 10 7-10 3 700 1.76 1.5
    SSF 12 200 1 950 7.98 5.0
    下载: 导出CSV

    表  3  碳纤维/不锈钢纤维珊瑚砂水泥砂浆配合比

    Table  3.   Mix ratio of carbon fiber/stainless steel fiber reinforced coral sand cement mortar

    工况配合比/(kg·m−3)
    水泥粉煤灰硅灰珊瑚砂人工海水减水剂CFSSF
    1711253951 373274900
    2711253951 373274926.40
    3711253951 373274926.439.9
    4711253951 373274926.479.8
    5711253951 373274926.4119.7
    下载: 导出CSV

    表  4  同一龄期下不同纤维掺量试样静态抗拉强度

    Table  4.   Static tensile strength of specimens with different fiber contents at the same age

    试件编号静态劈裂拉伸强度 /MPa平均强度/MPa强度增长率 /%
    CF/SSF-0/05.05.65.65.4
    CF/SSF-1.5/06.15.96.46.112.96
    CF/SSF-1.5/0.58.27.57.57.742.59
    CF/SSF-1.5/1.07.68.38.48.150.00
    CF/SSF-1.5/1.59.38.88.78.964.81
     注:试件编号CF/SSF-0/0表示CF的体积分数为0%,SSF体积分数为0%。
    下载: 导出CSV
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  • 收稿日期:  2023-12-27
  • 修回日期:  2024-03-30
  • 网络出版日期:  2024-04-01

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