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乳化沥青橡胶混凝土的力学性能

林强 刘赞群 禹雷 周蕴婵 崔雨

林强, 刘赞群, 禹雷, 等. 乳化沥青橡胶混凝土的力学性能[J]. 复合材料学报, 2022, 40(0): 1-9
引用本文: 林强, 刘赞群, 禹雷, 等. 乳化沥青橡胶混凝土的力学性能[J]. 复合材料学报, 2022, 40(0): 1-9
Qiang LIN, Zanqun LIU, Lei YU, Yunchan ZHOU, Yu CUI. Mechanical properties of emulsified asphalt rubber concrete[J]. Acta Materiae Compositae Sinica.
Citation: Qiang LIN, Zanqun LIU, Lei YU, Yunchan ZHOU, Yu CUI. Mechanical properties of emulsified asphalt rubber concrete[J]. Acta Materiae Compositae Sinica.

乳化沥青橡胶混凝土的力学性能

详细信息
    通讯作者:

    刘赞群,博士,教授,博士生导师,研究方向为高铁用关键工程材料、水泥乳化砂浆、自密实混凝土和混凝土耐久性等 E-mail: zanqun.liu@csu.edu.cn

  • 中图分类号: TB332

Mechanical properties of emulsified asphalt rubber concrete

  • 摘要: 对用乳化沥青(Emulsified asphalt, EA)改善橡胶混凝土(Crumb rubber concrete, CRC)的力学性能进行了研究。通过抗压,抗折,劈裂抗拉和三点弯曲试验,研究了5%、10%和15%三种橡胶掺量(等体积取代细骨料)下,EA理论计算成膜覆盖橡胶颗粒表面4层、6层和8层膜对应不同EA掺量对CRC力学性能的影响。试验结果发现,对比未预处理CRC和NaOH预处理CRC两个对照组:掺入不同掺量EA后,不同橡胶掺量的CRC的抗压强度和劈裂抗拉强度均有较大提高,CRC的峰值位移显著增大,弯曲弹性模量Eb明显降低;乳化沥青与橡胶质量比为0.15(6层EA膜)时,三种橡胶掺量下CRC较未预处理组相比抗压强度平均提高3.5%,峰值位移提高27.6%,Eb降低21.8%,乳化沥青橡胶混凝土具有较为突出的力学性能复合效应。

     

  • 图  1  橡胶颗粒粒度分布曲线

    Figure  1.  Size distribution curve of rubber particles

    图  2  沥青成膜覆盖理想模型

    Figure  2.  Ideal model of asphalt film covering

    图  3  不同EA膜数对橡胶混凝土抗压强度的影响

    Figure  3.  Effect of different layers of EA film on compressive strength of crumb rubber concrete

    图  4  不同EA膜数对橡胶混凝土抗折强度的影响

    Figure  4.  Effect of different layers of EA film on flexural strength of crumb rubber concrete

    图  5  不同EA膜数对橡胶混凝土劈裂抗拉强度影响

    Figure  5.  Effect of different layers of EA film on splitting tensile strength of crumb rubber concrete

    图  6  不同橡胶掺量下橡胶混凝土荷载-位移曲线

    Figure  6.  Load-deflection curves of crumb rubber concrete with different replacements of rubber

    图  7  不同EA膜数对橡胶混凝土弯曲弹性模量Eb的影响

    Figure  7.  Effect of different layers of EA film on Bending modulus of elasticity Eb of crumb rubber concrete

    图  8  不同EA膜数对橡胶混凝土韧性指标的影响

    Figure  8.  Effect of different layers of EA film on toughness index of crumb rubber concrete

    图  9  橡胶混凝土的微观形貌

    Figure  9.  Microscopic structures of crumb rubber content

    图  10  沥橡比对橡胶混凝土的综合影响

    Figure  10.  Comprehensive effect of asphalt to rubber ratio on crumb rubber concrete

    图  11  不同沥橡比对橡胶混凝土抗压强度影响

    Figure  11.  Changes of compressive strength of rubber concrete with different asphalt to rubber ratios

    表  1  混凝土配合比/(kg·m−3)

    Table  1.   Mix proportion of concrete/(kg·m−3)

    TypeSpecimen
    denotation
    CementWaterCoarse
    aggregate
    Fine
    aggregate
    Rubber
    particles
    Emulsified
    asphalt
    PCRC04501801152.73622.480N/A
    Rubber concreteCRC54501801152.73591.3611.35N/A
    CRC104501801152.73560.2322.70N/A
    CRC154501801152.73529.1134.05N/A
    NaOH
    treatment
    NCRC54501801152.73591.3611.35N/A
    NCRC104501801152.73560.2322.70N/A
    NCRC1504501801152.73529.1134.05N/A

    EA
    treatment
    CRC5 A4450179.501152.73591.3611.351.14
    CRC5 A6450179.241152.73591.3611.351.71
    CRC5 A8450178.991152.73591.3611.352.28
    CRC10 A4450178.991152.73560.2322.702.28
    CRC10 A6450178.481152.73560.2322.703.42
    CRC10 A8450177.981152.73560.2322.704.56
    CRC15 A4450178.311152.73529.1134.053.42
    CRC15 A6450177.461152.73529.1134.055.13
    CRC15 A8450176.621152.73529.1134.056.84
    Notes: PC-Plain concrete; (N)CRC5, (N)CRC10, (N)CRC15-rubber volume substitution ratios of 5%,10%,15%, respectively; A4, A6, A8-layer of emulsified asphalt (EA) of 4,6,8, respectively.
    下载: 导出CSV

    表  2  橡胶混凝土弯曲韧性参数

    Table  2.   Flexural toughness parameters of crumb rubber concrete

    TypeSpecimen
    denotation
    Eb/
    GPa
    Integral area/
    (kN·mm)
    Peak load/
    kN
    Peak displacement/
    mm
    Deflection of
    Initial crack/mm
    PCRC03.301.96013.7910..2730.239
    Rubber
    concrete
    CRC52.692.11812.6090.3070.269
    CRC102.352.13211.8230.3260.289
    CRC152.222.11111.6950.3370.302
    NaOH
    treatment
    NCRC52.632.05212.7530.3200.278
    NCRC102.301.99711.8080.3300.290
    NCRC152.012.08911.6230.3600.296
    EA
    Treatment
    CRC5 A42.522.53413.3620.3510.304
    CRC5 A61.992.44112.0710.4240.377
    CRC5 A81.902.45211.7520.4310.385
    CRC10 A42.172.04511.6310.3500.308
    CRC10 A61.782.37911.5960.4220.373
    CRC10 A81.882.41611.2100.4390.398
    CRC15 A41.902.02710.9920.3540.306
    CRC15 A61.622.15411.0560.3880.338
    CRC15 A81.712.48410.9590.4310.368
    Note: Eb—Bending modulus of elasticity.
    下载: 导出CSV
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  • 收稿日期:  2022-03-18
  • 录用日期:  2022-05-07
  • 修回日期:  2022-05-07
  • 网络出版日期:  2022-05-28

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