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Fracture behavior and crack mode of steel slag pervious concrete using acoustic emission technique
Structural Control and Health Monitoring ( IF 5.4 ) Pub Date : 2021-06-03 , DOI: 10.1002/stc.2796
Chen Chen 1 , Xudong Chen 1 , Wenlei Xu 1 , Xiyuan Cheng 1
Affiliation  

The three-point bending fracture tests of steel slag pervious concrete (SSPC) with different aggregate size and initial notch to depth ratio were done. Meanwhile, acoustic emission (AE) technique was used during the fracture test. In this paper, the relationship between fracture mechanics properties of SSPC and cumulative AE energy was explored; both b-value and cluster analysis between rise angle (RA) and AF (average frequency) were used to describe crack growth performance. The results show that fracture energy considering the boundary can be calculated by the cumulative AE energy. It is also verified that cumulative AE energy can reflect the fracture resistance curve (R-curve), and cumulative AE energy curve can be used to inverse the fracture mechanical curve. According to the k-means clustering analysis results of RA and AF value, the aggregate size has little effect on the percentage of tensile crack. However, with the increase of aggregate size, the possibility of shear fracture mode increases. The difference between the maximum and minimum b-value decreases rapidly when the ration of initial notch to depth is larger than 0.4. The research results can provide reference for AE technique to monitor SSPC pavement engineering.

中文翻译:

基于声发射技术的钢渣透水混凝土断裂行为及开裂模式

对不同骨料粒度和初始缺口深度比的钢渣透水混凝土(SSPC)进行了三点弯曲断裂试验。同时,在断裂试验过程中使用了声发射(AE)技术。本文探讨了SSPC的断裂力学性能与累积AE能量之间的关系;上升角 (RA) 和 AF(平均频率)之间的 b 值和聚类分析都用于描述裂纹扩展性能。结果表明,考虑边界的断裂能可以通过累积AE能量计算。也验证了累积AE能量可以反映断裂阻力曲线(R-曲线),累积AE能量曲线可以用来反演断裂力学曲线。根据RA和AF值的k-means聚类分析结果,骨料尺寸对拉伸裂纹的百分比影响不大。然而,随着骨料尺寸的增加,剪切断裂模式的可能性增加。当初始缺口与深度之比大于 0.4 时,最大和最小 b 值之间的差异迅速减小。研究结果可为AE技术监测SSPC路面工程提供参考。
更新日期:2021-08-04
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