碳纳米管混凝土三点弯曲梁的声发射及损伤演化特征

李慧宽 黄山秀 陈小羊 郭佳奇

李慧宽, 黄山秀, 陈小羊, 郭佳奇. 碳纳米管混凝土三点弯曲梁的声发射及损伤演化特征[J]. 高压物理学报. doi: 10.11858/gywlxb.20240850
引用本文: 李慧宽, 黄山秀, 陈小羊, 郭佳奇. 碳纳米管混凝土三点弯曲梁的声发射及损伤演化特征[J]. 高压物理学报. doi: 10.11858/gywlxb.20240850
LI Huikuan, HUANG Shanxiu, CHEN Xiaoyang, GUO Jiaqi. Acoustic Emission and Damage Evolution Characteristics of Carbon Nanotube Concrete Three-Point Bending Beam[J]. Chinese Journal of High Pressure Physics. doi: 10.11858/gywlxb.20240850
Citation: LI Huikuan, HUANG Shanxiu, CHEN Xiaoyang, GUO Jiaqi. Acoustic Emission and Damage Evolution Characteristics of Carbon Nanotube Concrete Three-Point Bending Beam[J]. Chinese Journal of High Pressure Physics. doi: 10.11858/gywlxb.20240850

碳纳米管混凝土三点弯曲梁的声发射及损伤演化特征

doi: 10.11858/gywlxb.20240850
基金项目: 国家重点研发计划(2023YFC3805903);河南理工大学博士基金(B2024-34);中建七局交通建设有限公司委托项目(H22-661)
详细信息
    作者简介:

    李慧宽(1998-),男,硕士研究生,主要从事碳材料、高性能混凝土及固废资源化利用研究. E-mail:huikuan0707@163.com

    通讯作者:

    黄山秀(1984-),女,博士,讲师,主要从事碳材料、高性能混凝土及固废资源化利用研究. E-mail:hsx3168@163.com

  • 中图分类号: O347.4; TU.45

Acoustic Emission and Damage Evolution Characteristics of Carbon Nanotube Concrete Three-Point Bending Beam

  • 摘要: 为研究碳纳米管掺量对混凝土梁损伤演化过程及裂纹扩展规律的影响,制备了质量分数分别为0、0.1%、0.3%、0.5%的碳纳米管混凝土三点弯曲梁试件。采用搭载声发射测试系统的YNS300电液伺服万能试验机开展三点弯曲试验,得到了声发射能量、振铃计数和幅值等声学信息,并基于声发射参数对裂纹类型、损伤演化过程进行分析。结果表明:碳纳米管混凝土三点弯曲梁破坏时产生的声发射能量明显高于素混凝土梁,但随着碳纳米管掺量的增加,其破坏时产生的声发射能量逐渐减小;碳纳米管的掺入可以提高混凝土三点弯曲梁的承载能力,但超过某一界限后,其承载能力随着碳纳米管掺量的增加而降低;碳纳米管的掺入使得混凝土三点弯曲梁第一次声发射幅值突变的时间提前,试样破坏前,振铃计数及累计振铃计数增长缓慢,近似直线,试样断裂瞬间,两者均急剧上升;声发射信号源隶属于拉伸裂纹,碳纳米管混凝土三点弯曲梁断裂属于Ⅰ型断裂,拉伸裂纹和剪切裂纹占比与碳纳米管掺量之间没有明显关系,但声发射平均频率、上升角度信号源数量与碳纳米管掺量之间具有显著的相关性。不同碳纳米管掺量下,混凝土三点弯曲梁试样的损伤演化规律基本保持一致,试验前期损伤曲线基本为水平直线,破坏阶段损伤变量首先处于快速增长阶段,而后呈陡增式增长。

     

  • 图  碳纳米管混凝土梁的制备流程

    Figure  1.  Preparation process of CNTC beam

    图  碳纳米管混凝土三点弯曲梁试验系统

    Figure  2.  Three-point bending beam test system of CNTC

    图  声发射能量、累计能量、荷载与时间的关系

    Figure  3.  Relationships between AE energy, cumulative energy, load and time

    图  振幅、荷载与时间的关系

    Figure  4.  Relationships between amplitude, load and time

    图  振铃计数、累计振铃计数、荷载与时间的关系

    Figure  5.  relationships between ringing count, cumulative ringing count, load and time

    图  拉剪裂纹分类方法及声发射参数表征

    Figure  6.  Classification of tensile-shear cracks and characterization of AE parameters

    图  CNTC梁三点弯曲试验过程中的fA-AR关系

    Figure  7.  fA-AR of CNTC beam during three-point bending test

    图  不同碳纳米管掺量混凝土三点弯曲梁的损伤演化过程

    Figure  8.  Damage evolution of concrete three-point bending beams with different content of carbon nanotube

    表  1  碳纳米管混凝土三点弯曲梁的配合比

    Table  1.   Mix proportion for CNTC in three-point bending beam test

    Mass/gw/%
    CementWaterRiver sandCoarse aggregateMWCNTs
    17286922232496800
    1728692223249681.7280.1
    1728692223249685.1840.3
    1728692223249688.6400.5
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  • 收稿日期:  2024-07-10
  • 修回日期:  2024-08-20
  • 网络出版日期:  2024-11-12

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