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表面改性重组竹筋与竹炭砂浆界面粘结性能

郑皓月 刘问

郑皓月, 刘问. 表面改性重组竹筋与竹炭砂浆界面粘结性能[J]. 复合材料学报, 2023, 40(10): 5848-5858. doi: 10.13801/j.cnki.fhclxb.20230203.001
引用本文: 郑皓月, 刘问. 表面改性重组竹筋与竹炭砂浆界面粘结性能[J]. 复合材料学报, 2023, 40(10): 5848-5858. doi: 10.13801/j.cnki.fhclxb.20230203.001
ZHENG Haoyue, LIU Wen. Bond performance between surface modified bamboo scrimber bar and bamboo biochar mortar[J]. Acta Materiae Compositae Sinica, 2023, 40(10): 5848-5858. doi: 10.13801/j.cnki.fhclxb.20230203.001
Citation: ZHENG Haoyue, LIU Wen. Bond performance between surface modified bamboo scrimber bar and bamboo biochar mortar[J]. Acta Materiae Compositae Sinica, 2023, 40(10): 5848-5858. doi: 10.13801/j.cnki.fhclxb.20230203.001

表面改性重组竹筋与竹炭砂浆界面粘结性能

doi: 10.13801/j.cnki.fhclxb.20230203.001
基金项目: 中央高校基本科研业务费专项资金资助(2021ZY53)
详细信息
    通讯作者:

    刘问,博士,副教授,硕士生导师,研究方向为竹木结构、低碳混凝土 E-mail: liuwen@bjfu.edu.cn

  • 中图分类号: TB332

Bond performance between surface modified bamboo scrimber bar and bamboo biochar mortar

Funds: Fundamental Research Funds for the Central Universities (2021ZY53)
  • 摘要: 为研究重组竹筋与竹炭砂浆的界面粘结性能,对共85个重组竹筋-竹炭砂浆试件进行中心拉拔试验,考虑了竹筋表面改性方法、等效直径、砂浆抗压强度、粘结长度等因素对界面粘结性能的影响。观察试件的粘结破坏形态,获取了各试件的粘结-滑移曲线、粘结强度和滑移量,分析了破坏机制,提出了界面粘结-滑移本构模型,得到了重组竹筋表面有效改性方法。结果表明:在不同初始条件下,拉拔试件存在3种破坏形态,分别为砂浆劈裂破坏、竹筋拉断破坏、竹筋拔出破坏,其中砂浆劈裂破坏最常见,破坏过程分为微滑移段、滑移段、下降段和残余段。竹筋表面经改性处理,其与砂浆界面粘结强度可提高13~46倍,界面粘结性能随竹筋粘结长度和等效直径的增大而降低,而砂浆强度对粘结性能的影响效果不显著。推荐使用粘砂和涂刷环氧砂浆两种方式对竹筋改性,在保证粘结性能的基础上,可改善养护过程中竹筋吸水膨胀导致与砂浆剥离,结构提前失效等问题。根据试验粘结-滑移曲线,得到经粘砂改性的重组竹筋-竹炭砂浆界面粘结-滑移本构模型,可准确预测重组竹筋与砂浆的界面粘结行为。经验证,该模型同样适用于试验中发生界面破坏的其他竹筋改性方法。

     

  • 图  1  重组竹抗拉试样

    Figure  1.  Bamboo scrimber tensile specimen

    R—Arc radius from the end of the collet to the beginning of the effective stretching area

    图  2  竹筋的不同表面改性方法

    Figure  2.  Different surface modification methods of bamboo scrimber bar

    图  3  拉拔试件示意图

    Figure  3.  Sketch of pullout sample

    L—Bonding length; a—Original thickness of bamboo scrimber bar; b—Original width of bamboo scrimber bar; bc—Diameter of bamboo biochar mortar

    图  4  加载装置

    Figure  4.  Loading installation

    图  5  重组竹筋-竹炭砂浆拉拔试件3种破坏形态

    Figure  5.  Three types failure modes of bamboo scrimber bar-bamboo biochar mortar pull-out specimens

    图  6  不同初始条件下重组竹筋-竹炭砂浆试件的平均粘结强度

    Figure  6.  Average bond strength of bamboo scrimber bar-bamboo biochar mortar specimens under different initial conditions

    图  7  重组竹筋-竹炭砂浆拉拔试件粘结-滑移曲线

    Figure  7.  Bond-slip curves of bamboo scrimber bar-bamboo biochar mortar pull-out specimens

    图  8  重组竹筋-竹炭砂浆拉拔试件粘结-滑移曲线简化模型

    Figure  8.  Bond-slip curve simplified model of bamboo scrimber bar-bamboo biochar mortar pull-out specimens

    τ0—Peak bonding stress; τu—Residual bonding stress; s0—Slip amount corresponding to peak bonding stress; su—Slip amount corresponding to residual bonding stress

    图  9  重组竹筋-竹炭砂浆试件A-0.5-140-360应变和应力分布规律

    Figure  9.  Strain and bonding stress distribution of bamboo scrimber bar-bamboo biochar mortar specimen A-0.5-140-360

    图  10  重组竹筋-竹炭砂浆本构模型验证

    Figure  10.  Constitutive model verification of bamboo scrimber-bamboo biochar mortar

    表  1  竹炭砂浆配合比

    Table  1.   Mix proportion of bamboo biochar mortar

    Water cement ratioCement/(kg·m−3)Bamboo biochar/(kg·m−3)Water/(kg·m−3)Sand/(kg·m−3)fcu/MPa
    0.45549.455.55250150050
    0.5564.305.70285150045
    0.58500.945.06300150040
    Note: fcu—Mortar pressure resistance intensity.
    下载: 导出CSV

    表  2  拉拔试件明细

    Table  2.   Details of pull-out specimens

    Specimen
    number
    fcu/MPaL/mma/mmb/mmd/mmSurface treatment methodFailure patternAverage value of bond strength/
    MPa
    A-0.5-50-3604550201824.19Stick sandP7.672
    A-0.5-70-3604570201824.19Stick sandP, S6.024
    A-0.5-100-36045100201824.19Stick sandS4.359
    A-0.5-140-36045140201824.19Stick sandS3.522
    A-0.5-180-36045180201824.19Stick sandS3.438
    A-0.58-100-36040100201824.19Stick sandS4.238
    A-0.45-100-36050100201824.19Stick sandS4.309
    A-0.5-100-21645100181219.10Stick sandF4.211
    A-0.5-100-27045100181521.01Stick sandF4.727
    A-0.5-100-50045100202528.65Stick sandS3.819
    B-0.5-100-360(20)45100201824.19NickP1.728
    B-0.5-100-360(40)45100201824.19NickF2.534
    B-0.5-100-360(60)45100201824.19NickF3.511
    C-0.5-100-360(1)45100201824.19Coat epoxy mortarS3.844
    C-0.5-100-360(2)45100201824.19Coat epoxy mortarS4.655
    O-0.5-100-36045100201824.19UntreatedP0.133
    O-0.5-180-36045180201824.19UntreatedP0.150
    Notes: A, B, C, O—Method of sticking sand, nicking, coating epoxy mortar and untreated bamboo scrimber surface modification methods; d—Equivalent diameter of bamboo scrimber bar; S—Spliting failure; P—Pulling-out failure; F represents the tensile failure.
    下载: 导出CSV

    表  3  竹筋膨胀率

    Table  3.   Expansion rate of bamboo scrimber bar

    Specimen numbera/mma1/mmWa/%b/mmb1/mmWb/%
    A-0.5-50-36020.0120.331.6018.0218.321.66
    A-0.5-100-36020.0320.321.4518.0618.331.50
    A-0.5-180-36019.9620.140.9018.1018.250.83
    A-0.58-100-36020.0020.361.8018.0318.452.33
    A-0.45-100-36020.0620.210.7518.0318.231.11
    A-0.5-100-50020.0520.351.5024.9825.421.76
    B-0.5-100-360(20)20.0320.934.4917.9718.784.51
    C-0.5-100-360(1)19.9920.170.9018.0018.221.22
    O-0.5-100-36020.0020.764.3018.0118.723.94
    Notes: a—Original thickness of bamboo scrimber bar; a1—Thickness of bamboo scrimber bar after 28 days of maintenance; Wa—Expansion rate of the thickness direction of the bamboo scrimber bar; b—Original width of bamboo scrimber bar; b1—Width of bamboo scrimber bar after 28 days of maintenance; Wb—Expansion rate of the width direction of the bamboo scrimber bar.
    下载: 导出CSV

    表  4  重组竹筋-竹炭砂浆试件粘结-滑移曲线拟合结果

    Table  4.   Bond-slip curves fitting results of bamboo scrimber bar-bamboo biochar mortar specimens

    Specimen numberRising stageDescending stage
    αR2nR2
    A-0.5-70-3600.3660.8802.2060.991
    A-0.5-100-3600.3320.9541.9690.994
    A-0.5-140-3600.3970.9312.0910.976
    A-0.5-180-3600.2390.9601.9990.975
    A-0.58-100-3600.4280.9761.9370.988
    A-0.45-100-3600.4320.9821.7440.958
    A-0.5-100-5000.4990.9472.3300.941
    Notes: α—Fitting coefficient of rising stage; R2—Correlation coefficient; n—Fitting coefficient of descending stage.
    下载: 导出CSV
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出版历程
  • 收稿日期:  2022-11-17
  • 修回日期:  2023-01-09
  • 录用日期:  2023-01-10
  • 网络出版日期:  2023-02-03
  • 刊出日期:  2023-10-15

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