大连理工大学学报2012，Vol.52Issue(5)：701-706,6.
自愈合混凝土损伤演化声发射监测及其评价技术
Damage evolution monitoring and evaluation of self-repairing concrete using acoustic emission technique
摘要
Abstract
The concrete ultimate load capacity is improved through self-repairing. Because there is a dearth of studies regarding damage evolution of self-repairing concrete, acoustic emission （AE） technology is presented to monitor its evolution process. The full-process damage of self-repairing concrete is monitored under three-point bending beam testing using AE technique. It is found that the initiation, propagation and evolution of self-repairing concrete cracks can be described using AE hits. Firstly, the corresponding relationship between the AE hits and load is testified by comparing with their embraceable curve. Secondly, the repairing effect of self-repairing concrete is judged using Kaiser effect and Felicity ratio. Finally, the different damage types of AE waveforms of self-repairing concrete are extracted and analyzed using wavelet singularity theory. The damage causes are analyzed according to the waveform frequency distribution. The testing results show the AE technique can provide a new testing method for self-repairing concrete damage judgment.关键词
自愈合混凝土/声发射/小波分析/损伤演化/安全评定Key words
self-repairing concrete/acoustic emission/wavelet analysis/damage evolution/safety evaluation分类
建筑与水利引用本文复制引用
李冬生,匡亚川,胡倩..自愈合混凝土损伤演化声发射监测及其评价技术[J].大连理工大学学报,2012,52(5):701-706,6.基金项目
国家自然科学基金资助项目 （）
教育部博士点新教师基金资助项目（200801411102）. （）
