An improved ultrasonic coda wave method for concrete behavior monitoring under various loading conditions

被引:23
作者
Hu, Hongwei [1 ]
Li, Dayu [1 ]
Wang, Lei [2 ]
Chen, Rui [2 ]
Xu, Xiaoqiang [1 ]
机构
[1] Changsha Univ Sci & Technol, Coll Automot & Mech Engn, Changsha 410114, Hunan, Peoples R China
[2] Changsha Univ Sci & Technol, Coll Civil Engn, Changsha 410114, Hunan, Peoples R China
基金
中国国家自然科学基金;
关键词
Coda wave; Concrete; Ultrasonic testing; Cross-correlation; SLOW DYNAMICS; MULTIPLE-SCATTERING; INTERFEROMETRY;
D O I
10.1016/j.ultras.2021.106498
中图分类号
O42 [声学];
学科分类号
070206 ; 082403 ;
摘要
Monitoring of concrete behavior is an important task to evaluate the safety of concrete structures. This paper proposes a new stretching factor accumulation method based on the stepwise coda wave interference (CWI) to accurately calculate the relative velocity change Av/v. The Av/v and residual decorrelation coefficient Kd are used to study the concrete behavior in step loading experiment and short-time fixed loading experiment. The results show that: (1) In the loading stage of step loading experiments, both Av/v and Kd can be used to monitor the load and the microcrack development; (2) In the relaxation stage of step loading experiments, the slow dynamics effect of concrete specimens can be characterized by Av/v and Kd; (3) In the short-time fixed loading experiments, both Av/v and Kd increase with the time of fixed loading, and the increasing rate of Av/v decreases with the increase of concrete strength. This work can be used to promote the development of ultrasonic testing techniques that aid in concrete behavior monitoring.
引用
收藏
页数:10
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