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冻融作用对自密实轻骨料混凝土声发射特性影响

李京军 闫珺 牛建刚

李京军, 闫珺, 牛建刚. 冻融作用对自密实轻骨料混凝土声发射特性影响[J]. 工程力学, 2022, 39(9): 133-140, 169. doi: 10.6052/j.issn.1000-4750.2021.05.0373
引用本文: 李京军, 闫珺, 牛建刚. 冻融作用对自密实轻骨料混凝土声发射特性影响[J]. 工程力学, 2022, 39(9): 133-140, 169. doi: 10.6052/j.issn.1000-4750.2021.05.0373
LI Jing-jun, YAN Jun, NIU Jian-gang. EFFECT OF FREEZE-THAW ACTION ON ACOUSTIC EMISSION CHARACTERISTICS OF SELF-COMPACTING LIGHTWEIGHT AGGREGATE CONCRETE[J]. Engineering Mechanics, 2022, 39(9): 133-140, 169. doi: 10.6052/j.issn.1000-4750.2021.05.0373
Citation: LI Jing-jun, YAN Jun, NIU Jian-gang. EFFECT OF FREEZE-THAW ACTION ON ACOUSTIC EMISSION CHARACTERISTICS OF SELF-COMPACTING LIGHTWEIGHT AGGREGATE CONCRETE[J]. Engineering Mechanics, 2022, 39(9): 133-140, 169. doi: 10.6052/j.issn.1000-4750.2021.05.0373

冻融作用对自密实轻骨料混凝土声发射特性影响

doi: 10.6052/j.issn.1000-4750.2021.05.0373
基金项目: 国家自然科学基金项目(51968058);内蒙古自治区自然科学基金项目(2020BS05020,2021MS05058);内蒙古自治区高等学校科学技术研究项目(NJZY20097);内蒙古科技大学创新基金项目(2019QDL-B50);内蒙古科技大学攀登计划项目(XZ-TJ-01);内蒙古科技大学建筑科学研究所开放基金项目(JYSJJ-2021Q04);内蒙古自治区本级事业单位高层次人才引进项目;包头市青年创新人才项目
详细信息
    作者简介:

    李京军(1990−),男,山东人,讲师,博士,硕导,主要从事钢-混凝土组合结构及高性能水泥基材料研究(E-mail: jingjunli@cqu.edu.cn)

    闫 珺(1992−),男,黑龙江人,硕士生,主要从事钢-混凝土组合结构研究(E-mail: 324012209@qq.com)

    通讯作者:

    牛建刚(1976−),男,山西人,教授,博士,院长,主要从事混凝土结构耐久性研究(E-mail: niujiangang@imust.edu.cn)

  • 中图分类号: TU528.2

EFFECT OF FREEZE-THAW ACTION ON ACOUSTIC EMISSION CHARACTERISTICS OF SELF-COMPACTING LIGHTWEIGHT AGGREGATE CONCRETE

  • 摘要: 为研究冻融后自密实轻骨料混凝土单轴压缩下的声发射(AE)特性,对未掺引气剂的自密实轻骨料混凝土试件进行0次、50次、100次快速冻融试验。结果表明:随着冻融次数增加,试件轴压应力-应变曲线趋于完整,峰值应力有明显降低;声发射峰值频率主要位于15 kHz~45 kHz, 85 kHz~105 kHz, 235 kHz~255 kHz和285 kHz~320 kHz 这4个“优势频段”区间,对应于混凝土内部预存裂纹或孔隙压密,骨料/砂浆界面增强层的开裂,粗骨料断裂破坏以及砂浆的开裂。受冻后的试件在轴压作用经历拉伸裂缝与剪切裂缝之间的交替转化,最终形成主裂缝导致破坏。冻融作用以及应力水平变化对AE信号源分布有较大影响,随着应力水平的增加,AE信号源趋于活跃,且在试样断裂面有聚集趋势。
  • 图  1  声发射探头布置示意图

    Figure  1.  Schematic diagram of AE sensor location

    图  2  质量损失率和相对动弹性模量的变化

    Figure  2.  Variation of mass loss rate and relative dynamic modulus of elasticity

    图  3  AE特征参数与加载时间的关系图(左: 振铃计数-时间关系图,右: 能量-时间关系图)

    Figure  3.  Relationship between AE characteristic parameters and loading time (left: the ringing count-time diagram; right: the energy-time diagram)

    图  4  RA和AF随加载时间的变化

    Figure  4.  Variation of RA and AF with loading time

    图  5  能量-幅值关联图

    Figure  5.  Energy- amplitude correlation diagram

    图  6  能量-峰值频率分布关系图

    Figure  6.  Energy and peak frequency distribution diagram

    图  7  轴压破坏形态图

    Figure  7.  Axial compression failure pattern diagram

    图  8  AE源空间定位图

    Figure  8.  AE source spatial location map

    表  1  自密实轻骨料混凝土配合比

    Table  1.   Mix proportion of self-compacting lightweight aggregate concrete /(kg/m3)

    水泥粉煤灰硅灰粗骨料减水剂/(wt.%)
    358108461796656130.3
    下载: 导出CSV

    表  2  自密实轻骨料混凝土性能指标

    Table  2.   Performance index of self-compacting lightweight aggregate concrete

    抗压强度/
    MPa
    干表观密度/
    (kg/m3)
    自密实性能
    扩展度/
    mm
    扩展时间
    T500/s
    J环扩展度/
    mm
    离析率/
    (%)
    54.218917002.67003.9
    下载: 导出CSV

    表  3  声发射系统参数

    Table  3.   Parameters of AE system

    参数类型参数值
    数据传输速度/(MB/s) 132
    触发器处理能力/Mflops 150
    最低噪声阈值/dB 18
    频率范围/kHz 10.0~2.1×103
    高速处理速度/(hits/s) 20 000
    PDT/μs 35
    HDT/μs 150
    HLT/μs 300
    下载: 导出CSV

    表  4  声发射探头位置

    Table  4.   Location of AE probe

    探头编号XYZ
    5033.325
    6033.3−25
    11−2566.60
    122566.60
    下载: 导出CSV
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出版历程
  • 收稿日期:  2021-05-19
  • 修回日期:  2021-09-10
  • 网络出版日期:  2021-09-18
  • 刊出日期:  2022-09-01

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