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Study on the breaking process and damage characteristics of abrasive water jet impacting concrete based on acoustic emission

机译：基于声发射的磨料水射流冲击混凝土破碎工艺及损伤特性研究

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摘要

The breaking process and damage distribution characteristics of concrete are the theoretical basis for improving the quality and safety of concrete impacted by abrasive water jet (AWJ) technology. Therefore, the process of AWJ impacting concrete is monitored online based on acoustic emission (AE) technology in this paper. The results show that the AE signals of AWJ impacting concrete have two peaks in frequency domain, the low frequency signals are generated by AWJ and the high frequency signals are generated by concrete breaking. The autoregressive (AR) model is used to estimate the power spectrum of AE signals. The variations of AWJ signals and concrete crushing signals in the impact process are analyzed based on the power of AE signal defined by the area under the power spectral density (PSD) curve. Through monitoring the development process of erosion hole inside the transparent materials impacted by AWJ, it is verified that the power of the concrete crushing signals after the formation of the erosion hole can reflect the penetration rate well. In addition, the damage characteristics of concrete specimens impacted by AWJ are studied in this paper by measuring the transverse ultrasonic velocity of the specimens before and after impact. (C) 2020 Elsevier Ltd. All rights reserved.
机译：混凝土的破碎过程和损伤分布特性是提高受磨料水射流（AWJ）技术影响的混凝土质量和安全性的理论依据。因此，基于本文的声发射（AE）技术在线监测AWJ冲击混凝土的过程。结果表明，撞击混凝土的AE信号在频域中具有两个峰值，由AWJ产生低频信号，并且通过混凝土断开产生高频信号。自回归（AR）模型用于估计AE信号的功率谱。基于由功率谱密度（PSD）曲线下的区域限定的AE信号的功率来分析冲击过程中的AWJ信号和混凝土粉碎信号的变化。通过监测由AWJ影响的透明材料内部的侵蚀孔的开发过程，验证了混凝土破碎信号在形成侵蚀孔后的功率可以很好地反映穿透速率。此外，通过测量撞击前后标本的横向超声速度，研究了由AWJ影响的混凝土试样的损伤特性。 （c）2020 elestvier有限公司保留所有权利。

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  • 来源
    《Construction and Building Materials》 |2020年第1期|120085.1-120085.10|共10页
  • 作者

    Liu Jialiang; Du Shujian; Xue Yongzhi;

  • 作者单位

    Chongqing Jiaotong Univ Chongqing Key Laboratary Traff & Transportat Chongqing 400074 Peoples R China|Chongqing Jiaotong Univ Civil Engn Coll Chongqing 400074 Peoples R China;

    Chongqing Jiaotong Univ Chongqing Key Laboratary Traff & Transportat Chongqing 400074 Peoples R China|Chongqing Jiaotong Univ Civil Engn Coll Chongqing 400074 Peoples R China;

    South China Univ Technol Sch Mech & Automot Engn Guangzhou 510641 Guangdong Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Abrasive water jet; Concrete; Acoustic emission; Erosion hole; Damage;

    机译：磨料水射流;混凝土;声发射;侵蚀孔;损坏;

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