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橡胶地聚物混凝土力学性能及阻尼特性试验研究

孙杰 陈国珍 吕康琪 王安宁

孙杰, 陈国珍, 吕康琪, 等. 橡胶地聚物混凝土力学性能及阻尼特性试验研究[J]. 复合材料学报, 2021, 39(0): 1-12
引用本文: 孙杰, 陈国珍, 吕康琪, 等. 橡胶地聚物混凝土力学性能及阻尼特性试验研究[J]. 复合材料学报, 2021, 39(0): 1-12
Jie SUN, Guozhen CHEN, Kangqi LV, Anning WANG. Experimental study on mechanical properties and damping characteristics of rubber geopolymer concrete[J]. Acta Materiae Compositae Sinica.
Citation: Jie SUN, Guozhen CHEN, Kangqi LV, Anning WANG. Experimental study on mechanical properties and damping characteristics of rubber geopolymer concrete[J]. Acta Materiae Compositae Sinica.

橡胶地聚物混凝土力学性能及阻尼特性试验研究

基金项目: 湖北省建设科技计划项目(202144);湖北省教育厅科学研究计划青年人才项目(Q20201101)
详细信息
    通讯作者:

    孙杰,博士,副教授,硕士生导师,研究方向为路基路面材料,新型建筑材料 E-mail: 63460968@qq.com

  • 中图分类号: TU52

Experimental study on mechanical properties and damping characteristics of rubber geopolymer concrete

  • 摘要: 为了研究橡胶地聚物混凝土的力学性能及阻尼特性,基于橡胶颗粒替代体积分数为试验参数,进行了混凝土力学性能试验和悬臂梁在低周反复作用下的自由振动试验,分析了橡胶地聚物混凝土的力学性能随橡胶颗粒替代体积分数变化的影响规律,研究了橡胶地聚物混凝土悬臂梁在不同损伤控制位移下和不同橡胶颗粒替代体积分数下的阻尼性能,建立了悬臂梁阻尼比与损伤指数之间的关系。结果表明:少量的橡胶颗粒能够提高地聚物混凝土抗折强度,改善混凝土的韧性;相同损伤指数的橡胶地聚物混凝土悬臂梁的阻尼比随着橡胶颗粒替代体积分数的增大而增大;随着损伤指数的增大,同一橡胶颗粒替代体积分数下的橡胶地聚物混凝土悬臂梁阻尼比均呈现先增大后减小的趋势;通过分析不同替代体积分数下的橡胶地聚物混凝土的弯曲动刚度、损伤指数以及阻尼比和损伤指数之间的关系,采用替代体积分数为10%的橡胶颗粒不仅可以增强橡胶地聚物混凝土悬臂梁的阻尼特性,而且其刚度退化规律具有可控性。

     

  • 图  1  钢筋布置图

    Figure  1.  Reinforcement arrangement

    图  2  橡胶地聚物混凝土悬臂梁加载图

    Figure  2.  Loading diagram of the rubber geopolymer concrete cantilever beam

    图  3  自由振动试验加载程序

    Figure  3.  Free vibration test loading procedure

    图  4  自由振动测试装置

    Figure  4.  Free vibration testing device

    图  5  橡胶地聚物混凝土抗压强度

    Figure  5.  The compressive strength of the rubber geopolymer concrete

    图  6  橡胶地聚物混凝土抗折强度

    Figure  6.  Flexural strength of the rubber geopolymer concrete

    图  7  橡胶颗粒在混凝土中裂纹桥接

    Figure  7.  Crack bridging of the rubber particles in the concrete

    图  8  抗折试验后橡胶地聚物混凝土试块

    Figure  8.  The rubber geopolymer concrete specimen after bending

    图  9  橡胶地聚物混凝土力学性能变异系数

    Figure  9.  Variation coefficient of the mechanical properties of the rubber geopolymer concrete

    图  10  橡胶地聚物混凝土悬臂梁自由衰减时程曲线

    Figure  10.  The time history curve of vibration of the rubber geopolymer concrete cantilever beam

    图  11  橡胶地聚物混凝土悬臂梁各阶段裂缝发展

    Figure  11.  Fracture development of the rubber geopolymer concrete cantilever beam at the different stages

    图  12  橡胶地聚物混凝土悬臂梁各损伤阶段的阻尼比

    Figure  12.  Damping ratio at damage stages of the rubber geopolymer concrete cantilever beam

    图  13  橡胶地聚物混凝土悬臂梁各损伤阶段的基本频率

    Figure  13.  Fundamental frequency at damage stages of the rubber geopolymer concrete cantilever beam

    图  14  橡胶地聚物混凝土截面的弯曲动刚度与损伤位移的关系

    Figure  14.  Relationship between bending dynamic stiffness and the damage displacement of the rubber geopolymer concrete

    图  15  橡胶地聚物混凝土损伤指数随位移角的变化

    Figure  15.  Change of damage indexes of the rubber geopolymer concrete with displacement angle

    图  16  橡胶地聚物混凝土损伤指数 $ {I}_{\text{D}} $ 与位移角的统计关系

    Figure  16.  Statistical relationship between damage index $ {I}_{\text{D}} $ of the rubber geopolymer concrete and displacement angle

    图  17  橡胶地聚物混凝土阻尼比与损伤指数的关系

    Figure  17.  Relationship between damping ratio and damage index of the rubber geopolymer concrete

    图  18  橡胶地聚物混凝土阻尼比与损伤指数的统计关系

    Figure  18.  Statistical relationship between damping ratio and damage index of the rubber geopolymer concrete

    表  2  橡胶颗粒替代体积分数

    Table  2.   Replacement volume fraction of the rubber particles

    Specimen GC 5%R/GC 10%R/GC 15%R/GC
    Volume fraction
    of rubber
    replacement /%
    0 5 10 15
    Notes: R—Rubber particles; GC—Geopolymer concrete.
    下载: 导出CSV

    表  3  橡胶地聚物混凝土立方体抗压强度及变异系数

    Table  3.   Compressive strength and variation coefficient of the rubber geopolymer concrete

    Specimen GC 5%R/GC 10%R/GC 15%R/GC
    Compressive strength/MPa 71.88 57.74 54.66 52.84
    Standard deviation 8.35 4.04 7.31 10.14
    Variation coefficient 0.11 0.07 0.13 0.19
    下载: 导出CSV

    表  4  橡胶地聚物混凝土抗折强度及变异系数

    Table  4.   Flexural strength and variation coefficient of the rubber geopolymer concrete

    Specimen GC 5%R/GC 10%R/GC 5%R/GC
    Flexural strength/MPa 5.58 6.08 5.51 5.41
    Standard deviation 0.20 0.62 0.43 0.55
    Variation coefficient 0.03 0.10 0.08 0.10
    下载: 导出CSV

    表  5  橡胶地聚物混凝土悬臂梁各损伤阶段基本频率 $ f $ 和阻尼比 $ \xi $

    Table  5.   Fundamental frequency $ f $ and damping ratio $ \xi $ of the rubber geopolymer concrete cantilever beam

    $ {y}_{i} $/mm GC 5%R/GC 10%R/GC 15%R/GC
    $ f $/Hz $ \xi $/% $ f $/Hz $ \xi $/% $ f $/Hz $ \xi $/% $ f $/Hz $ \xi $/%
    0 79.5 1.03 77 1.26 76.8 1.74 75.5 1.88
    5 73.5 1.26 74 1.83 71.5 2.20 68.5 2.34
    10 70 1.84 70 2.78 69 2.98 55.2 4.67
    20 65 2.46 63 3.65 61.2 3.54 51.4 4.44
    30 61 2.19 58.5 2.16 53.6 3.21 48.5 3.32
    40 59 1.96 54 1.86 47.5 2.44 45.2 2.84
    Note: $ {y}_{i} $ is the damage control displacement and the damage control displacement is 0mm, 5mm, 10mm, 20mm, 30mm and 40mm, which are respectively recorded as $ {y}_{0} $ ~ $ {y}_{5} $.
    下载: 导出CSV
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  • 收稿日期:  2021-10-19
  • 录用日期:  2021-11-24
  • 修回日期:  2021-11-23
  • 网络出版日期:  2021-12-23

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