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海水珊瑚砂ECC的力学性能与裂纹宽度控制

王振波 郝如升 李鹏飞 韩宇栋 孙鹏

王振波, 郝如升, 李鹏飞, 等. 海水珊瑚砂ECC的力学性能与裂纹宽度控制[J]. 复合材料学报, 2022, 40(0): 1-12
引用本文: 王振波, 郝如升, 李鹏飞, 等. 海水珊瑚砂ECC的力学性能与裂纹宽度控制[J]. 复合材料学报, 2022, 40(0): 1-12
Zhenbo WANG, Rusheng HAO, Pengfei LI, Yudong HAN, Peng SUN. Mechanical properties and crack width control of seawater coral sand ECC[J]. Acta Materiae Compositae Sinica.
Citation: Zhenbo WANG, Rusheng HAO, Pengfei LI, Yudong HAN, Peng SUN. Mechanical properties and crack width control of seawater coral sand ECC[J]. Acta Materiae Compositae Sinica.

海水珊瑚砂ECC的力学性能与裂纹宽度控制

基金项目: 国家自然科学基金(51808545);中央高校基本科研业务费专项资金资助项目(2022 YQLJ05)
详细信息
    通讯作者:

    王振波,博士,副教授,硕士生导师,研究方向为高延性水泥基复合材料(ECC / SHCC)、海水珊瑚骨料混凝土、混凝土断裂力学 E-mail: wangzb@cumtb.edu.cn

  • 中图分类号: TU528

Mechanical properties and crack width control of seawater coral sand ECC

Funds: National Natural Science Foundation of China (51808545); Fundamental Research Funds for the Central Universities (2022 YQLJ05)
  • 摘要: 为解决珊瑚混凝土的脆性与耐久性问题,采用岛礁地域性原材料制备了海水珊瑚砂高延性水泥基材料(Seawater Coral sand Engineered Cementitious Composites, SCECC)。试验研究了不同骨料种类、最大粒径和细度模数对ECC抗压、抗拉力学性能和裂缝控制能力的影响。结果表明:随珊瑚砂细度模数减小,SCECC抗压强度先增后降,最大粒径2.36mm的特细砂SCECC达到最高(63.3MPa);降低珊瑚砂最大粒径,SCECC拉伸性能参数不同程度地提升。最大粒径0.60mm的SCECC拉伸性能最优,其初裂强度、抗拉强度和极限拉应变分别为2.29MPa、4.11MPa和5.15%,临近破坏时的平均裂纹宽度可控制在81μm。相比于淡水石英砂ECC,SCECC抗压强度高且早期强度发展快(7d抗压强度可达28d的73%~78%)。两种ECC的骨料破坏和聚乙烯醇(PVA)纤维失效模式不同,SCECC拉伸强度和弹性模量略低,但延性及裂缝控制能力明显更优。

     

  • 图  1  珊瑚砂的形貌

    Figure  1.  Appearances of coral sand

    图  2  轴拉装置与试件尺寸(单位:mm)

    Figure  2.  Setup of uniaxial tension and sample size (Unit: mm)

    图  3  各组ECC抗压强度

    Figure  3.  Compressive strength of ECC specimens

    图  4  各组ECC单轴拉伸应力-应变曲线

    Figure  4.  Uniaxial tensile stress-strain curves of ECC specimens

    图  5  各组ECC单轴拉伸性能参数

    Figure  5.  Parameters for uniaxial tensile properties of each ECC

    图  6  ECC试件断面形态

    Figure  6.  Characteristics of crack plane of ECC specimens

    图  7  各组ECC裂纹形态图

    Figure  7.  Cracking morphologies of each ECC

    图  8  各组ECC不同应变下平均裂纹宽度发展趋势

    Figure  8.  Development trend of average crack width at different strains of each ECC

    图  9  各组ECC断面处PVA纤维的SEM图像

    Figure  9.  SEM images of PVA fiber at crack planes of each ECC

    表  1  P·O 42.5水泥化学成分

    Table  1.   Chemical composition of P·O 42.5 cement

    ComponentCaOSiO2Fe2O3Al2O3SO3MgOK2O
    Mass fraction/wt%66.5415.994.263.832.781.611.46
    下载: 导出CSV

    表  2  人工模拟海水成分

    Table  2.   Composition of artificial seawater

    ComponentNaClCaCl2MgSO4MgCl2
    Content/(mol·L−1)445.217.2251.6864.82
    下载: 导出CSV

    表  3  聚乙烯醇(PVA)纤维物理和力学性能

    Table  3.   Physical and mechanical properties of polyvinyl alcohol (PVA) fiber

    Density/
    (g·cm−3)
    Tensile strength/MPaElastic modulus/GPaDiameter/mmLength/mm
    1.2162042.80.03912
    下载: 导出CSV

    表  4  珊瑚砂化学成分

    Table  4.   Chemical composition of coral sand

    ComponentNa2OMgOAl2O3SiO2SO3K2OCaOTiO2Fe2O3SrO
    Mass fraction/wt%0.460.52.436.060.430.3585.250.292.071.91
    下载: 导出CSV

    表  5  两种骨料的压碎指标

    Table  5.   Crushing index of two aggregates

    Aggregate typeCrushing value in different particle size ranges/%
    1.18-2.36 mm0.60-1.18 mm0.30-0.60 mm
    Quartz sand14.04.63.4
    Coral sand25.512.63.7
    下载: 导出CSV

    表  6  各组高延性水泥基材料(ECC)骨料级配参数

    Table  6.   Aggregate grading parameters of each engineered cementitious composite (ECC) mixtures

    SampleProportion of aggregates in different particle size ranges/%Fineness modulus
    1.18-2.36 mm0.60-1.18 mm0-0.60 mm
    SC-2.36-13025452.65(Medium sand)
    SC-2.36-2515851.55(Extra fine sand)
    SC-1.18011891.43(Extra fine sand)
    SC-0.60001001.23(Extra fine sand)
    TQ-0.60001001.23(Extra fine sand)
    Notes: SC-2.36-1 represents first grade of seawater coral sand ECC with the maximum grain size of 2.36 mm; TQ-0.60 represents tap water-quartz water sand ECC with the maximum grain size of 0.60 mm.
    下载: 导出CSV

    表  7  ECC配合比(质量比)

    Table  7.   Mix proportions of ECC (Mass ratio)

    SampleCementFly ashSandWaterPVA fiberSuper plasticizer
    Coral sandQuartz sandSeawaterTap water
    SC-2.36-110.430.5-0.5-0.0320.00123
    SC-2.36-210.430.5-0.5-0.0320.00135
    SC-1.1810.430.5-0.5-0.0320.00147
    SC-0.6010.430.5-0.5-0.0320.00172
    TQ-0.6010.43-0.5-0.50.0320.00172
    下载: 导出CSV
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  • 收稿日期:  2022-04-11
  • 录用日期:  2022-05-26
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