Journal of Shandong University(Engineering Science) ›› 2021, Vol. 51 ›› Issue (5): 84-90.doi: 10.6040/j.issn.1672-3961.0.2021.016

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Influence of concrete aggregate particle size on acoustic emission detection

Junwei LI1(),Fei XU1,2,*(),Bing WANG3,Yang GAO1   

  1. 1. Key Laboratory of Large Structure Health Monitoring and Control, Shijiazhuang Tiedao University, Shijiazhuang 050043, Hebei, China
    2. School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, Sichuan, China
    3. School of Civil Engineering and Mechanics, Yanshan University, Qinhuangdao 066004, Hebei, China
  • Received:2021-01-11 Online:2021-10-20 Published:2021-09-29
  • Contact: Fei XU E-mail:294644911@qq.com;xufei@stdu.edu.cn

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Abstract:

The lead breaking test of concrete specimens with different aggregate sizes was carried out by using acoustic emission technology. The influences of different aggregate particle sizes on the positioning accuracy, sound velocity calibration and time parameter setting of acoustic emission detection concrete materials and the selection of the optimal sensor layout were investigated. The results showed that aggregate was one of the main factors affecting the accuracy of acoustic emission detection. When the aggregate particle size increased 5 mm, the sound velocity decreases by 7.5%. When the aggregate particle size increased 5 mm, the rise time decreased about 3.5%, and the maximum rise time is not more than 200 μs. Perform "multi-multi-point" tests could reasonably determine the optimal sensor arrangement and effectively reduce the positioning error, but it couldn't eliminate the error.

Key words: aggregate particle size, acoustic emission, broken lead test, concrete specimens

CLC Number: 

  • TU528.1

Fig.1

Test diagram of linear sound velocity measurement"

Fig.2

Schematic diagram of time parameter setting"

Fig.3

Schematic diagram of five sensors to be selected"

Fig.4

Propagation diagram of sound wave in concrete"

Fig.5

Comparison of sound velocities of different aggregate sizes"

Table 1

Summary of average rise time of each specimen"

试件 上升时间/μs
粒径0~5 mm 粒径5~10 mm 粒径10~15 mm
1 194.67 189.67 181.00
2 199.33 188.67 184.67
3 195.33 187.00 179.67
4 196.00 190.33 184.67
5 196.33 187.67 184.33
平均值 196.33 188.66 182.86
标准差 1.60 1.23 2.11

Fig.6

Summary of average error of various arrangement modes at each point"

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