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不同龄期下珊瑚海水海砂混凝土三向受压力学性能

吴辉琴 申彦兵 陈宇良 叶培欢

吴辉琴, 申彦兵, 陈宇良, 等. 不同龄期下珊瑚海水海砂混凝土三向受压力学性能[J]. 复合材料学报, 2024, 43(0): 1-12.
引用本文: 吴辉琴, 申彦兵, 陈宇良, 等. 不同龄期下珊瑚海水海砂混凝土三向受压力学性能[J]. 复合材料学报, 2024, 43(0): 1-12.
WU Huiqin, SHEN Yanbing, CHEN Yuliang, et al. Three-dimensional compressive mechanical properties of coral seawater sea sand concrete at different ages[J]. Acta Materiae Compositae Sinica.
Citation: WU Huiqin, SHEN Yanbing, CHEN Yuliang, et al. Three-dimensional compressive mechanical properties of coral seawater sea sand concrete at different ages[J]. Acta Materiae Compositae Sinica.

不同龄期下珊瑚海水海砂混凝土三向受压力学性能

基金项目: 国家自然科学基金(52368013; 51908141);广西自然科学基金项目(24GXNSFBA010364);广西重点研发计划(桂科AB23075093)
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; TB332

Three-dimensional compressive mechanical properties of coral seawater sea sand concrete at different ages

Funds: National Natural Science Foundation of China (52368013; 51908141); Guangxi Natural Science Foundation Project (24GXNSFBA010364); Guangxi Key Research and Development Plan (Guike AB23075093)
  • 摘要: 为探究珊瑚海水海砂混凝土(CSSC)在三向受压条件下的力学性能及其损伤发展过程,考虑围压值和龄期等因素,设计制作了132个CSSC圆柱体试件进行常规三轴试验。结果表明:随着围压值的增大,试件破坏形态由竖向劈裂破坏转为斜向剪切破坏,应力-应变曲线峰部抬高、下降段逐渐平缓,损伤发展得到抑制;龄期T≤60d时,各项力学性能指标变化趋于稳定;T=180d时,屈服应变及屈服应力较28d时分别提高了8.88%、11.64%;T=365d时,弹性模量较28d提高9.18%;根据试验数据,提出了不同围压值下CSSC屈服应力、屈服应变、弹性模量计算公式;围压CSSC内部损伤演化影响显著,且随着围压值增大,龄期对其的影响逐渐减弱;最后,提出了同时考虑龄期、围压两因素的CSSC强度预测公式,预测结果与试验结果拟合程度较好。

     

  • 图  1  珊瑚骨料破碎前表观特征

    Figure  1.  Apparent characteristics of coral aggregate before crushing

    图  2  珊瑚粗骨料、海砂细骨料级配曲线

    Figure  2.  Gradation curve of coral coarse aggregate and sea sand fine aggregate

    图  3  CSSC试件破坏形态图

    Figure  3.  Failure pattern diagram of CSSC specimens

    图  4  CSSC应力-应变全过程曲线

    Figure  4.  Stress-strain curves of the whole process of the CSSC specimen

    图  5  CSSC偏移屈服点示意图

    Figure  5.  CSSC offset yield point diagram

    图  6  龄期对CSSC力学性能的影响

    Figure  6.  Effect of age on mechanical properties of CSSC

    图  7  围压对CSSC力学性能的影响

    Figure  7.  Effect of confining pressure on mechanical properties of CSSC

    图  8  CSSC应变-损伤关系曲线

    Figure  8.  Strain-damage relationship curve of CSSC

    图  9  不同种类混凝土不同龄期下复合因子拟合曲线

    Figure  9.  Composite factor fitting curves of different types of concrete at different ages

    表  1  珊瑚粗骨料物理性能

    Table  1.   Physical properties of coral coarse aggregate

    Property Water absorption
    capacity in 1 h
    (by mass)/%
    Porosity
    (by volume)/%
    Moisture content
    (by mass)/%
    Bulk density/
    (kg∙m−3)
    Apparent density/
    (kg∙m−3)
    Cylinder pressure
    strength/MPa
    Value 12.79 54.21 0.67 879.90 1667.00 4.11
    下载: 导出CSV

    表  2  海水的主要化学成分(g/L)

    Table  2.   Main chemical constituents of seawater (g/L)

    NaClNa2SO4MgCl2CaCl2KCl
    24.284.025.041.150.59
    下载: 导出CSV

    表  3  珊瑚海水海砂混凝土(CSSC)配合比

    Table  3.   Mix proportion of coral seawater sea sand concrete (CSSC)

    ConcreteW/CMaterial consumption/(kg·m−3)Slump/mmCube crushing strength/MPa
    CASea sandCementSeawaterAdditional seawaterWa
    CSSC0.4655.8760.1535.0214.075.11.415632.09
    Notes: CA—Coral coarse aggregate; Wa—Water reducing admixture; W/C—Water-cement ratio.
    下载: 导出CSV

    表  4  CSSC不同龄期下AB取值及拟合系数

    Table  4.   The values of A and B and the fitting coefficients of CSSC at different ages

    Type28 d60 d180 d365 d
    A5.2675.2205.7605.940
    B3.5423.0303.1593.350
    R20.830.940.900.92
    下载: 导出CSV

    表  5  不同种类混凝土调整系数Kf

    Table  5.   Adjustment coefficient Kf of different kinds of concrete

    Concrete type Kf Reference
    Lightweight aggregate concrete 0.0208σw+0.7079 Chen[29]
    0.0218σw+0.7443 Ye[42]
    Recycled aggregate concrete 0.0226σw+0.7455 Chen[41]
    0.0136σw+0.4629 Paula[43]
    Natural aggregate concrete 0.0121σw+0.3229 Sfer[44]
    High-strength concrete 0.0059σw+0.2010 Feng[45]
    0.0061σw+0.2011 Lu[20]
    下载: 导出CSV
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  • 收稿日期:  2024-09-11
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