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高温后珊瑚海水海砂混凝土直剪力学性能及损伤演化

陈宇良 刘志华 叶培欢 陈宗平

陈宇良, 刘志华, 叶培欢, 等. 高温后珊瑚海水海砂混凝土直剪力学性能及损伤演化[J]. 复合材料学报, 2023, 40(7): 4128-4138. doi: 10.13801/j.cnki.fhclxb.20221024.002
引用本文: 陈宇良, 刘志华, 叶培欢, 等. 高温后珊瑚海水海砂混凝土直剪力学性能及损伤演化[J]. 复合材料学报, 2023, 40(7): 4128-4138. doi: 10.13801/j.cnki.fhclxb.20221024.002
CHEN Yuliang, LIU Zhihua, YE Peihuan, et al. Direct shear mechanical properties and damage evolution of coral seawater sea-sand concrete after high temperature[J]. Acta Materiae Compositae Sinica, 2023, 40(7): 4128-4138. doi: 10.13801/j.cnki.fhclxb.20221024.002
Citation: CHEN Yuliang, LIU Zhihua, YE Peihuan, et al. Direct shear mechanical properties and damage evolution of coral seawater sea-sand concrete after high temperature[J]. Acta Materiae Compositae Sinica, 2023, 40(7): 4128-4138. doi: 10.13801/j.cnki.fhclxb.20221024.002

高温后珊瑚海水海砂混凝土直剪力学性能及损伤演化

doi: 10.13801/j.cnki.fhclxb.20221024.002
基金项目: 中国博士后科学基金(2021 M693854);八桂学者专项经费资助项目([2019]79号);广西科技大学博士基金项目(校科博18 Z09)
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-混凝土组合结构研究、海洋及近海混凝土结构等E-mail: ylchen@gxust.edu.cn

  • 中图分类号: TU528;TB333

Direct shear mechanical properties and damage evolution of coral seawater sea-sand concrete after high temperature

Funds: Postdoctoral Science Foundation of China (2021 M693854); Bagui Scholars Special Funding Project ([2019] No.79); Doctoral Fund Project of Guangxi University of Science and Technology (18 Z09)
  • 摘要: 为探究高温后珊瑚海水海砂混凝土(CSSC)直剪力学性能及其损伤本构关系,以经历最高温度T、恒温时长H为变化参数,设计并完成了高温后CSSC直剪试验。通过试验观察了高温后CSSC直剪破坏形态,获取了相应的应力-位移曲线,得到了TH对CSSC剪切强度、体积膨胀及质量损失的影响规律,对比分析了高温后CSSC损伤演变过程。研究结果表明:高温导致CSSC内部出现不均匀温度场,并出现表面龟裂、边角崩裂等现象;随着TH的增加,CSSC剪切承载力逐渐降低,体积膨胀率和质量损失率逐渐增大。当T > 400℃后剪切强度下降速率加快;T = 800℃时CSSC直剪强度仅为常温下的39%。最后,提出了高温后CSSC直剪强度计算方程及其损伤演化过程。

     

  • 图  1  时间-温度曲线

    Figure  1.  Time-high temperature curves

    图  2  加载装置

    Figure  2.  Test setup

    图  3  不同经历温度下CSSC直剪典型破坏形态

    Figure  3.  Direct shear typical failure patterns of CSSC under different high temperatures

    图  4  高温后CSSC直剪应力-位移曲线

    Figure  4.  Direct shear stress-displacement curves of CSSC under high temperatures

    图  5  不同经历温度下CSSC垂直位移-剪切位移曲线

    Figure  5.  Vertical displacement-shear displacement curves of CSSC under different high temperatures

    图  6  经历温度对CSSC剪切应力及体积膨胀率的影响

    Figure  6.  Effects of different high temperatures on CSSC's volume expansion and shear stress

    图  7  经历温度对CSSC质量损失的影响

    Figure  7.  Effect of high temperatures on CSSC's mass loss

    图  8  400℃恒温时长对CSSC剪应力及体积膨胀率的影响

    Figure  8.  Effects of 400℃ constant temperature duration on CSSC's shear stress and volume expansion

    图  9  400℃恒温时长对CSSC质量损失的影响

    Figure  9.  Effect of 400℃ constant temperature duration on CSSC's mass loss

    图  10  高温后CSSC损伤曲线

    Figure  10.  CSSC damage curves after high temperatures

    图  11  高温后CSSC直剪实测曲线-理论曲线对照

    Figure  11.  Comparison of direct shear test curve-theoretical curve of CSSC under different high temperatures

    Vτ—Direct shear load; s—Direct shear displacement

    表  1  珊瑚粗骨料(CA)物理性能

    Table  1.   Physical properties of coral coarse aggregate (CA)

    PropertyWater absorption/%Moisture content/%Bulk density/(kg·m−3)Apparent density/(kg·m−3)
    Value12.790.67879.901667.00
    下载: 导出CSV

    表  2  珊瑚海水海砂混凝土(CSSC)试验设计及其抗压强度

    Table  2.   Test design and compressive strength of coral seawater sea-sand concrete (CSSC)

    NumberT/℃H/hfcu T/MPa
    T25 2530.43
    T200-H1200127.08
    T300-H1300126.66
    T400-H1400122.38
    T400-H2400223.94
    T400-H3400322.12
    T500-H1500119.57
    T700-H1700110.47
    T600-H1600114.38
    T800-H18001 8.93
    Notes: fcu T—Cubic compressive strength of CSSC after high temperature; T—High temperature; H—Constant high temperature duration.
    下载: 导出CSV

    表  3  CSSC的配合比

    Table  3.   Mix ratio of CSSC kg·m−3

    W/CCoralSea-sandCementSeawaterAdditional seawaterWater reducing
    0.4655.8760.1535.0214.075.11.4
    Note: W/C—Water-cement ratio of CSSC.
    下载: 导出CSV

    表  4  高温后CSSC直剪强度数据对照

    Table  4.   Comparison of CSSC direct shear strength data after high temperatures

    T/℃fcu T/MPaτ1/MPaτ2/MPaτ3/MPaτA/MPaStandard deviationVarianceCoefficient of variationτ Τ/MPaτA/τ Τ
    20027.083.662.943.133.240.370.140.123.270.99
    30026.662.692.963.232.960.270.070.093.120.95
    40022.382.992.472.742.730.260.070.102.840.96
    50019.572.121.712.522.120.410.160.192.380.89
    60014.381.651.491.781.640.150.020.091.830.90
    70010.471.511.081.481.360.240.060.181.321.03
    8008.931.031.131.080.070.010.070.921.17
    Notes: τ1, τ2, τ3 —Shear test values of CSSC after high temperature; τA—Mean shear test value of CSSC after high temperature; τ Τ—Mean shear theory value of CSSC after high temperature.
    下载: 导出CSV
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  • 收稿日期:  2022-08-08
  • 修回日期:  2022-09-09
  • 录用日期:  2022-10-15
  • 网络出版日期:  2022-10-24
  • 刊出日期:  2023-07-15

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