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橡胶/混凝土盐冻循环后性能劣化及微观结构

姚韦靖 刘雨姗 王婷雅 庞建勇

姚韦靖, 刘雨姗, 王婷雅, 等. 橡胶/混凝土盐冻循环后性能劣化及微观结构[J]. 复合材料学报, 2021, 38(12): 4294-4304. doi: 10.13801/j.cnki.fhclxb.20210202.005
引用本文: 姚韦靖, 刘雨姗, 王婷雅, 等. 橡胶/混凝土盐冻循环后性能劣化及微观结构[J]. 复合材料学报, 2021, 38(12): 4294-4304. doi: 10.13801/j.cnki.fhclxb.20210202.005
YAO Weijing, LIU Yushan, WANG Tingya, et al. Performance degradation and microscopic structure of rubber/concrete after salt freeze-thaw cycles[J]. Acta Materiae Compositae Sinica, 2021, 38(12): 4294-4304. doi: 10.13801/j.cnki.fhclxb.20210202.005
Citation: YAO Weijing, LIU Yushan, WANG Tingya, et al. Performance degradation and microscopic structure of rubber/concrete after salt freeze-thaw cycles[J]. Acta Materiae Compositae Sinica, 2021, 38(12): 4294-4304. doi: 10.13801/j.cnki.fhclxb.20210202.005

橡胶/混凝土盐冻循环后性能劣化及微观结构

doi: 10.13801/j.cnki.fhclxb.20210202.005
基金项目: 安徽省高等学校自然科学研究重点项目(KJ2020A0297);中国博士后科学基金面上资助(2020M681974);安徽理工大学校级重点项目(QN2019115)
详细信息
    通讯作者:

    庞建勇,博士,教授,博士生导师,研究方向为水泥混凝土类材料  E-mail:pangjyong@163.com

  • 中图分类号: TU528

Performance degradation and microscopic structure of rubber/concrete after salt freeze-thaw cycles

  • 摘要: 制备普通混凝土(Normal concrete,NC)和橡胶/混凝土基体(Rubber/NC),研究盐冻循环60次内,表观现象、剥落量、抗压强度损失等性能指标劣化过程,采用超声波无损检测法评价混凝土盐冻循环破坏前后超声参数变化,建立相对波速、损伤度与抗压强度的关系,利用SEM观察盐冻循环损伤前后试件微结构变化。结果表明:随盐冻循环次数增加,混凝土试件表面剥蚀愈显著,剥落量增加,内部损伤、强度损失逐渐加剧,超声参数与抗压强度具有密切相关性;混凝土经历盐冻破坏后,内部结构呈疏松絮状,孔隙、裂纹愈加显现,密实度下降,造成宏观力学性能劣化。但弹性橡胶细集料掺入后有效缓解结冰压引起的内部开裂和孔隙扩大,各阶段橡胶/混凝土基体劣化程度均优于普通混凝土,以橡胶掺量 (与胶凝材料质量比) 10% (10%Rubber/NC)各性能指标最优,经历60次盐冻循环后,普通混凝土抗压强度损失率为58.5%,10%Rubber/NC抗压强度损失率为48.0%。

     

  • 图  1  橡胶实拍 (a) 及微观形貌 (b)

    Figure  1.  Picture (a) and microscopic structure (b) of rubber

    图  2  混凝土盐冻试验示意图

    Figure  2.  Schematic diagram of concrete salt freezing test

    图  3  混凝土盐冻循环表观现象

    Figure  3.  Apparent phenomenon of concrete after salt freezing cycles

    图  4  混凝土盐冻循环剥落量变化

    Figure  4.  Flaking amount change of concrete after salt freezing cycles

    图  5  混凝土盐冻循环次数与超声参数的关系

    Figure  5.  Relationship between ultrasound parameters and number of salt freezing cycles

    图  6  混凝土盐冻循环相对抗压强度变化

    Figure  6.  Relative compressive strength change of concrete after salt freezing cycles

    图  7  混凝土盐冻循环超声参数与抗压强度的拟合关系

    Figure  7.  Fitted relationship between ultrasound parameters and compressive strength of concrete after salt freezing cycle

    图  8  普通混凝土(NC)盐冻循环微观形貌

    Figure  8.  Microscopic structure of normal concrete (NC) after salt freezing-thaw cycles

    图  9  10%Rubber/NC的微观形貌

    Figure  9.  Microscopic structure of 10%Rubber/NC

    图  10  10%Rubber/NC盐冻循环微观形貌

    Figure  10.  Microscopic structures of 10%Rubber/NC after salt freezing-thaw cycles

    表  1  P·C 42.5级水泥技术参数

    Table  1.   Technical parameters of P·C 42.5 cement

    Fineness/
    (m2·kg−1)
    Ignition loss/%Water requirement of
    standard consistency/%
    Setting time/minCompressive strength/MPaStability
    InitialFinial3 days28 days
    342 3.5 25.9 165 220 29.9 49.75 Conformity
    下载: 导出CSV

    表  2  粉煤灰化学成分组成

    Table  2.   Chemical composition of fly ash

    CompositionSiO2Al2O3Fe2O3CaOMgONa2O
    Content/wt% 53.26 34.72 4.07 2.47 0.39 1.90
    下载: 导出CSV

    表  3  混凝土配合比

    Table  3.   Concrete mixture ratio kg·m−3

    Concrete numberCementing materialFine aggregateGravelWaterWater reducer
    CementFly ashSandRubber
    NC 310 50 791.0 0 1115 150 3.4
    5%Rubber/NC 310 50 769.4 18 1115 150 3.4
    10%Rubber/NC 310 50 747.8 36 1115 150 3.4
    15%Rubber/NC 310 50 726.2 54 1115 150 3.4
    20%Rubber/NC 310 50 704.6 72 1115 150 3.4
    Notes: NC—Normal concrete; 5%Rubber/NC, 10%Rubber/NC, 15%Rubber/NC and 20%Rubber/NC—Rubber/NC with rubber content (mass ratio to cementitious material) of 5%, 10%, 15% and 20%, respectively.
    下载: 导出CSV

    表  4  混凝土性能测试结果

    Table  4.   Concrete performance test results

    Concrete
    number
    Workability28 days apparent
    density/(kg·m−3)
    28 days compressive
    strength/MPa
    28 days tensile
    strength/MPa
    Slump/mmSlump flow/mm
    NC 170 340 2423 40.68 4.52
    5%Rubber/NC 195 365 2412 36.91 4.05
    10%Rubber/NC 215 390 2403 32.69 3.78
    15%Rubber/NC 240 425 2398 29.38 3.25
    20%Rubber/NC 265 460 2387 26.06 2.89
    下载: 导出CSV

    表  5  混凝土盐冻循环后超声参数与抗压强度损失拟合结果

    Table  5.   Fitting results of ultrasound parameters and compressive strength of concrete after salt freezing cycle

    Concrete numberUltrasound parameterFitting formulaR2
    NC Relative velocity VR ${F_{\rm{R}}} = 0.15{{\rm{e}}^{2.389{V_{\rm{R}}}}} - 0.416$ 0.98
    Damage degree D ${F_{\rm{R}}} = - 0.377\ln D + 0.004$ 0.93
    5%Rubber/NC Relative velocity VR ${F_{\rm{R}}} = 0.001{{\rm{e}}^{6.629{V_{\rm{R}}}}} + 0.251$ 0.98
    Damage degree D ${F_{\rm{R}}} = - 0.272\ln D + 0.088$ 0.97
    10%Rubber/NC Relative velocity VR ${F_{\rm{R}}} = 0.0002{{\rm{e}}^{7.909{V_{\rm{R}}}}} + 0.382$ 0.99
    Damage degree D ${F_{\rm{R}}} = - 0.127\ln D + 0.357$ 0.95
    15%Rubber/NC Relative velocity VR ${F_{\rm{R}}} = 0.634{{\rm{e}}^{1.541{V_{\rm{R}}}}} - 1.724$ 0.96
    Damage degree D ${F_{\rm{R}}} = - 0.380\ln D - 0.111$ 0.93
    20%Rubber/NC Relative velocity VR ${F_{\rm{R}}} = 0.077{{\rm{e}}^{2.875{V_{\rm{R}}}}} - 0.194$ 0.99
    Damage degree D ${F_{\rm{R}}} = - 0.364\ln D + 0.010$ 0.98
    Note: FR—Relative compressive strength.
    下载: 导出CSV
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  • 收稿日期:  2020-12-07
  • 录用日期:  2021-01-18
  • 网络出版日期:  2021-02-02
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