Acoustic emission sources of breakdown failure due to pulsed-electric discharge in concrete
Acoustic emission sources of breakdown failure due to pulsed-electric discharge in concrete
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DOI：
10.1016/j.conbuildmat.2010.10.013
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发表时间：
2011-04
影响因子：
7.4
通讯作者：
N. N. Kencanawati-N.;M. Shigeishi
中科院分区：
文献类型：
--
作者：
N. N. Kencanawati-N.;M. Shigeishi
应用声发射技术对混凝土中存在的击穿破坏进行定位。用6.4kJ能量的脉冲放电对混凝土试件进行了损伤试验。进行了声发射参数分析和波形分析。从声发射参数分析的结果，与现有的击穿故障的声发射源确定在压缩试验。在定位分析之前，采用小波变换对检测到的声发射波形进行去噪处理。通过对这些去噪后的声发射波形进行源定位分析，确定了混凝土中的击穿破坏区域。在混凝土试件中发现了5个破坏部位。微裂缝从混凝土试件的下部开始产生，然后在整个混凝土体中随机扩展。
Acoustic emission (AE) technique is applied to locate existing breakdown failure in concrete. Damage was generated in a concrete sample applying 6.4kJ energy of pulsed-electric discharge. Both AE parameter analysis and waveform analysis were carried out. From results of AE parameter analysis, AE sources associated with existing breakdown failure were identified in the compression test. Prior to location analysis, AE waveforms detected were de-noised by employing the wavelet transform. The area of breakdown failure in concrete is identified by the source location analysis of these de-noised AE waveforms. Five locations of breakdown failure are found in the concrete sample. Micro-cracks occur starting from the lower part of concrete sample and then spread randomly in entire concrete body.