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混杂纤维增强应变硬化水泥基复合材料抗弯冲击性能

霍彦霖 孙华阳 刘天安 和怡馨 陈智韬 吕承博 杨英姿

霍彦霖, 孙华阳, 刘天安, 等. 混杂纤维增强应变硬化水泥基复合材料抗弯冲击性能[J]. 复合材料学报, 2022, 40(0): 1-12
引用本文: 霍彦霖, 孙华阳, 刘天安, 等. 混杂纤维增强应变硬化水泥基复合材料抗弯冲击性能[J]. 复合材料学报, 2022, 40(0): 1-12
Yanlin HUO, Huayang SUN, Tianan LIU, Yixin HE, Zhitao CHEN, Chengbo LV, Yingzi YANG. Flexural impact behavior of hybrid fiber-reinforced strain hardening cementitious composites[J]. Acta Materiae Compositae Sinica.
Citation: Yanlin HUO, Huayang SUN, Tianan LIU, Yixin HE, Zhitao CHEN, Chengbo LV, Yingzi YANG. Flexural impact behavior of hybrid fiber-reinforced strain hardening cementitious composites[J]. Acta Materiae Compositae Sinica.

混杂纤维增强应变硬化水泥基复合材料抗弯冲击性能

基金项目: 国家自然科学基金 (52178797)
详细信息
    通讯作者:

    陈智韬,博士,研究方向为高性能纤维增强复合材料 E-mail: rainczt@hotmail.com

    杨英姿,博士,教授,博士生导师,研究方向为高性能纤维增强复合材料 E-mail: yzyang@hit.edu.cn

  • 中图分类号: TB332

Flexural impact behavior of hybrid fiber-reinforced strain hardening cementitious composites

  • 摘要: 首先研究了在准静态作用下不同纤维掺量以及基体强度的混杂纤维增强SHCC的抗压和抗弯性能。实验结果表明混杂钢纤维可大幅提高SHCC材料的强度,其中抗压强度和抗弯强度分别提高了10.1%和13.9%。其次,采用落锤式冲击系统开展了混杂纤维增强SHCC在不同冲击高度下的动态抗弯性能试验。研究发现,混杂钢纤维的动态抗弯强度比单一纤维SHCC提高了10%~36%,具有明显的应变率效应。混杂纤维增强SHCC能量耗散与弯曲变形之间存在线性关系。最后,提出利用五维表征雷达图综合评估混杂纤维增强SHCC的成本和力学性能,并建议了最佳配合比。

     

  • 图  1  聚乙烯醇纤维(PVA)、聚乙烯纤维(PE)和钢纤维(SF)

    Figure  1.  Polyvinyl alcohol fiber (PVA), Polyethylene fiber (PE) and Steel fiber (SF)

    图  2  混杂纤维增强SHCC准静态三点弯曲试验示意图

    Figure  2.  Quasi-static three-point bending test diagram of hybrid fiber reinforced SHCC

    图  3  混杂纤维增强SHCC落锤式抗弯冲击试验装置

    Figure  3.  Drop hammer bending impact test machine of hybrid fiber reinforced SHCC

    图  4  混杂纤维增强SHCC的抗压强度

    Figure  4.  Compressive strength of hybrid fiber reinforced SHCC

    图  5  2%PVA/SHCC的平均荷载-挠度曲线

    Figure  5.  Average load-deflection curves of 2%PVA/SHCC

    图  6  准静态下混杂纤维增强SHCC弯曲荷载-挠度曲线

    Figure  6.  Bending load-deflection curve of hybrid fiber-reinforced SHCC under quasi-static condition

    图  7  混杂纤维增强SHCC预实验冲击时程曲线:(a) 荷载-时程曲线;(b) 冲量-时程曲线

    Figure  7.  Pre-experimental impact time curves of hybrid fiber-reinforced SHCC: (a) Load-time curve; (b) Impulse-time curve

    图  8  混杂纤维增强SHCC加速度时程频率分析和低通滤波:(a) 频谱分析;(b) 加速度信号和滤波结果;(c) 竖向速度时程结果;(d) 竖向位移时程结果

    Figure  8.  Acceleration-time frequency analysis and low-pass filtering of hybrid fiber-reinforced SHCC: (a) Spectrum analysis; (b) Acceleration signal and filtering results; (c) Vertical velocity-time results; (d) Vertical displacement-time results

    图  9  动态冲击作用下混杂纤维增强SHCC弯曲荷载-挠度曲线

    Figure  9.  Bending load-deflection curve of hybrid fiber-reinforced SHCC under dynamic impact

    图  10  动态冲击作用下混杂纤维增强SHCC的外力功-挠度曲线

    Figure  10.  External force work-deflection curve of hybrid fiber-reinforced SHCC under dynamic impact

    图  11  考虑力学性能和成本的混杂纤维增强SHCC五维表征雷达图

    Figure  11.  Radar map for five-dimensional evaluation of hybrid fiber-reinforced SHCC considering mechanical properties and cost

    图  12  混杂纤维增强SHCC五维表征雷达图归一化后的包络面积

    Figure  12.  Normalized envelope area of hybrid fiber-reinforced SHCC five-dimensional characterization radar map

    表  1  基体中水泥、粉煤灰和硅灰的基本参数

    Table  1.   Basic parameters of cement, fly ash and silica fume in cement mortar matrix

    IngredientSiO2/wt%Al2O3/wt%CaO/wt%Fe2O3/wt%MgO/wt%SO3/wt%R2O/wt%Loss on ignition/wt%
    Cement21.015.4862.323.981.732.630.51.60
    Fly ash66.5718.953.094.401.220.311.992.58
    Silica fume90.570.770.331.741.680.40-1.7
    下载: 导出CSV

    表  2  PVA、PE和SF的物理性能参数

    Table  2.   Physical properties of PVA, PE and SF

    FiberDiameter/μmLength/mmTensile strength/MPaYoung modules/GPaElongation/%Density/(kg·m−3)
    PVA391216004261.3
    PE241830001102.420.97
    SF15013285022047.8
    下载: 导出CSV

    表  3  混杂纤维增强应变硬化水泥基复合材料(SHCC)试件编号及配合比设计

    Table  3.   Specimen codes and mix design of hybrid fiber reinforced strain-hardening cementitious composites (SHCC)

    No.CementFly ashSilica fumeSandWaterFiber content/ vol%Superplasticizer
    PVAPEST
    1.5%PVA-0.5%SF/SHCC0.30.60.10.20.251.5-0.50.01
    2%PVA/SHCC0.30.60.10.20.252--0.01
    2%PVA-0.25%SF/SHCC0.30.60.10.20.252-0.250.01
    1.5%PE-0.5%SF/SHCC0.30.60.10.20.25-1.50.50.01
    2%PE/SHCC0.30.60.10.20.25-2-0.01
    2%PE-0.25%SF/SHCC0.30.60.10.20.25-20.250.01
    1.5%HPE-0.5%SF/SHCC0.40.50.10.20.2-1.50.50.012
    2%HPE/SHCC0.40.50.10.20.2-2-0.012
    Notes: The data in the table are the mass fraction of each mixed ingredient; The H in the number indicates C100-SHCC.
    下载: 导出CSV

    表  4  混杂纤维增强SHCC准静态弯曲试验结果

    Table  4.   Summary of quasi-static bending test results of hybrid fiber reinforced SHCC

    No.PLOP/ NPMOR/ NfMOR/ MPaδMOR/ mmTELOP/
    (J·10−3)
    EMOR /
    (J·10−3)
    1.5%PVA-0.5%SF/SHCC208.4274.718.38.742.848.52075.7
    2%PVA/SHCC123.3223.214.912.161.737.72325.1
    2%PVA-0.25%SF/SHCC205.1262.317.512.347.758.32781.9
    1.5%PE-0.5%SF/SHCC189.0260.217.321.576.161.14649.1
    2%PE/SHCC99.7228.415.233.292.558.35392.8
    2%PE-0.25%SF/SHCC138.6238.515.933.081.679.76503.4
    1.5%HPE-0.5%SF/SHCC252.9462.230.823.9155.697.915233.2
    2%HPE/SHCC166.4422.828.130.5193.378.715212.7
    Notes: P—Applied load; f—Flexural stress; δ—Deflection; T—Toughness; E—Energy; LOP—Limit of proportionality (first-cracking point). MOR—Modulus of rupture (peak point).
    下载: 导出CSV

    表  5  混杂纤维增强SHCC动态弯曲试验结果

    Table  5.   Summary of dynamic bending test results of hybrid fiber-reinforced SHCC

    No.Drop height/mmPMOR/N DIF
    1.5%PVA-0.5%SF/SHCC 50 592.4 2.16
    100 783.4 3.51
    200 1252.5 4.56

    2%PVA/SHCC
    50 543.6 2.44
    100 678.4 3.04
    200 1116.0 5.00
    2%PVA-0.25%SF/SHCC 50 812.0 3.10
    100 982.9 3.75
    200 1307.3 4.98
    1.5%PE-0.5%SF/SHCC 50 519.5 2.00
    100 645.0 2.48
    200 1057.9 4.07
    2%PE/SHCC 50 382.5 1.67
    100 539.1 2.36
    200 989.2 4.33
    2%PE-0.25%SF/SHCC 50 688.5 2.89
    100 791.1 3.32
    200 1054.5 4.42
    0.5%SF/SHCC 100 809.2 1.75
    200 1418.9 3.07
    300 - -
    1.5%HPE- 100 775.8 1.83
    200 1252.7 2.96
    300 1621.5 3.84
    Notes: DIF= PMOR,D / PMOR, PMOR,D—Dynamic post-cracking load; -: Data is not available because accelerometer overrange.
    下载: 导出CSV

    表  6  混杂纤维增强SHCC各原材料的成本价格

    Table  6.   Cost of each raw material of hybrid fiber-reinforced SHCC

    IngredientsCementFly ashSilica fumeQuartz SandPVAPESteel fiberSP
    Cost/ ¥·kg−10.50.21.23200200840
    下载: 导出CSV
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  • 收稿日期:  2022-05-09
  • 录用日期:  2022-06-09
  • 修回日期:  2022-05-28
  • 网络出版日期:  2022-06-27

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