Acoustic emission characteristics of wet sieving concrete and three-graded one in xiaowan arch dam under static flexural-tensile
Acoustic emission characteristics of wet sieving concrete and three-graded one in xiaowan arch dam under static flexural-tensile
复制标题
小湾拱坝湿筛分混凝土和三级配混凝土静弯拉声发射特性
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
Chen, Hou-Qun1, 2
中科院分区：
文献类型：
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作者：
Wang, Yan1;Wu, Sheng-Xing1;Zhou, Ji-Kai1;Chen, Hou-Qun1, 2
Combining with flexural-tensile tests of wet sieving and three-graded concrete in Xiaowan arch dam,feature parameters and waveforms of acoustic emission(AE) signals under action of third-point flexural-tensile were acquired using a full-digital acoustic emission system.The law of acoustic emission activities in each loading stages was analyzed,the statistical features of the peak frequencies and the frequency centroids calculated from the FFT power spectra of the acoustic emission waves were compared,the damage and fracture mechanisms were identified based on the acoustic emission parameters,and the localized failure zones of microcracks were also located using the commercial software AEwin.It was found in a three-graded concrete comparing with a wet sieving concrete that acoustic emission in the former is easier to induce damage,and lower b value of acoustic emission is observed in each loading stages;the peak frequencies of the acoustic emission in the former appear in frequency bands of 100 kHz~125 kHz and 225 kHz~250 kHz,and the frequency centroids are lower than those of the latter;two specific mechanisms are identified in the former but within the same time duration one is identified in the latter;the localized zone of microcrack in the former is larger than that in the latter.
