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高性能水泥基复合材料的压剪性能和破坏准则

谢发祥 韩旭 蔡定鹏 陈徐东

谢发祥, 韩旭, 蔡定鹏, 等. 高性能水泥基复合材料的压剪性能和破坏准则[J]. 复合材料学报, 2022, 40(0): 1-9
引用本文: 谢发祥, 韩旭, 蔡定鹏, 等. 高性能水泥基复合材料的压剪性能和破坏准则[J]. 复合材料学报, 2022, 40(0): 1-9
Faxiang XIE, Xu HAN, Dingpeng CAI, Xudong CHEN. Compression-shear performance and failure criteria of the high-performance cement-based composite[J]. Acta Materiae Compositae Sinica.
Citation: Faxiang XIE, Xu HAN, Dingpeng CAI, Xudong CHEN. Compression-shear performance and failure criteria of the high-performance cement-based composite[J]. Acta Materiae Compositae Sinica.

高性能水泥基复合材料的压剪性能和破坏准则

详细信息
    通讯作者:

    薛新华,博士,教授,博士生导师,研究方向为岩土工程. E-mail: xuexinhua@scu.edu.cn

  • 中图分类号: TU528.59

Compression-shear performance and failure criteria of the high-performance cement-based composite

  • 摘要: 高性能水泥基复合材料 (High-performance cement based composite, HPCC)是建筑领域的一种前沿性材料,其强度高、韧性强,具有很好的应用前景。高强度钢纤维通常以适当的混合比例加入高性能水泥基材料中。设计并浇筑了四种不同钢纤维体积分数(0.0%、0.5%、1.0%、2.0%)的HPCC,对不同纤维含量的试件的压剪复合性能进行了深入研究。通过试验首先给出了HPCC复合应力作用下基于莫尔-库仑的压剪强度模型。研究结果表明纤维掺量对HPCC的压剪界面摩擦系数影响较小,其平均值为2.8826,不同纤维掺入量的HPCC的摩擦系数与均值相比的差异在1.44%~8.51%之间;黏聚力则与钢纤维体积掺量呈二次抛物线关系。而HPCC压剪位移峰值与钢纤维掺入量之间呈现先增加后减小的现象。其次,对HPCC破坏界面进行SEM形貌分析,研究钢纤维影响HPCC基体的微观机制,从SEM形态出发解释了材料压剪强度和位移变化的微观机理。最后,结合试验结果和已有文献研究,提出了基于Ottosen模型的HPCC破坏准则,并给出了具体的拟合参数,表明HPCC八面体剪应力高于普通混凝土材料。试验数据与理论分析结果吻合较好,能够反映HPCC的破坏包络面特征。

     

  • 图  1  试验采用的钢纤维

    Figure  1.  Steel fibers adopted in the experiments

    图  2  加载设备和剪切面示意图

    Figure  2.  Loading equipment and sketchy shear surface

    图  3  HPCC的压剪试验荷载-位移曲线

    Figure  3.  Compression-shear load versus displacement curves of HPCC specimens

    图  4  HPCC压剪强度与轴向应力关系

    Figure  4.  Relationships of compression-shear strength and axial stress of HPCC

    图  5  HPCC摩擦系数与钢纤维含量关系

    Figure  5.  Friction coefficient versus fiber content of HPCC

    图  6  HPCC黏聚力与钢纤维含量关系

    Figure  6.  Cohesive stress versus fiber content of HPCC

    图  7  HPCC峰值轴向荷载与剪切位移峰值关系

    Figure  7.  Relationship between axial force and peak shear displacement of HPCC

    图  8  HPCC的微观形貌照片

    Figure  8.  Micro morphology photo of HPCC

    图  9  普通混凝土与HPCC的Ottosen破坏准则曲线比较

    Figure  9.  Comparison of Ottosen failure criterion curves between ordinary concrete and HPCC

    图  10  HPCC偏平面上的破坏包络线

    Figure  10.  Ultimate strength envelope in the deviatoric plane of HPCC

    表  1  不同高性能水泥基材料(HPCC)配合比 (kg/m3)

    Table  1.   Various mix proportions of high-performance cement-based composites (HPCC) (kg/m3)

    SpecimenCementHDC/VWaterWater reducing agentSandSteel fiber
    C80036018017.0930.0-
    0.5%SF/C80036018017.0925.439
    1%SF/C80036018017.0920.778
    2%SF/C80036018017.0911.4156
    Notes: SF—Steel fiber; C—Concrete; HDC/V is a mineral blending material with a certain fineness and activity with fly ash and ultrafine mineral powder as the main raw materials.
    下载: 导出CSV

    表  2  HPCC试验工况

    Table  2.   Designed experimental cases of HPCC

    ItemLoad profileAxial load/
    kN
    Number of
    load cases
    P-C- compUniaxial compression-1
    SF/C-P-comp3
    P-C- splitSplit tension-1
    P-SF/C- splitSplit tension-3
    P-C-X4
    P-SF/C- XCombined compression-shear15,25,35,4511
    Notes: P=0%,0.5%,1%,2%, is the volume fraction of steel fibers; X=15,25,35,45 kN is the axial pressure in the composite com
    pression-shear tests.
    下载: 导出CSV

    表  3  不同配合比HPCC的单轴抗压和劈裂抗拉强度

    Table  3.   Uniaxial compression and splitting tensile strength of various HPCC

    SpecimenCompressive strength/MPaSplit tensile strength/MPa
    Test 1Test 2Test 3AverageSDTest 1Test 2Test 3AverageSD
    C113.72115.73118.34115.931.897.377.976.827.390.47
    0.5%SF/C135.14121.65121.56126.126.3812.2912.6113.2112.700.38
    1%SF/C144.96147.81135.68142.835.1813.6314.0313.5313.730.22
    2%SF/C137.61120.19127.58128.467.1414.4413.4114.0013.950.42
    下载: 导出CSV

    表  4  不同配合比HPCC试件压剪复合试验特征值

    Table  4.   Characteristic values of compression-shear composite experiments for HPCC specimens with different mix proportions

    SpecimenPeak load/kN${\tau _{{\text{fc}}}}$/MPa${\varepsilon _1}/{10^{ - 3}}$
    C-1590.179.024.51
    C-25126.1712.624.64
    C-35148.2714.835.93
    C-45169.4016.948.42
    0.5%SF/C-15129.6012.964.36
    0.5%SF/C-25162.3316.235.97
    0.5%SF/C-35174.3017.436.27
    0.5%SF/C-45212.4321.247.48
    1%SF/C-15152.2115.227.52
    1%SF/C-25211.8021.189.85
    1%SF/C-35217.6721.779.83
    1%SF/C-45251.7325.1711.67
    2%SF/C-25199.9319.999.29
    2%SF/C-35237.7723.787.74
    2%SF/C-45252.2725.239.94
    Notes: ${\tau _{{\text{fc}}}}$—Peak shear load; $ {\varepsilon }_{1} $is the displacement of HPCC when the shear load reaches peak.
    下载: 导出CSV

    表  5  HPCC剪切摩擦系数μ和黏聚力c

    Table  5.   Friction coefficient μ and cohesive stress μ of HPCC

    Specimen$\mu $(Error)$c$${R^2}$
    C2.8054/−2.68%5.12750.9726
    0.5%SF/C2.7558/−4.40%8.33050.9441
    1%SF/C3.1280/8.51%11.10740.9694
    2%SF/C2.8411/−1.44%13.07050.9504
    Average2.8826--
    下载: 导出CSV

    表  6  Ottosen破坏准则的拟合参数

    Table  6.   Fitting parameters of Ottosen failure criterion

    $A$$B$${k_1}$${k_2}$
    1.324.0112.680.98
    下载: 导出CSV
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  • 收稿日期:  2021-11-22
  • 录用日期:  2022-01-15
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