School of Civil and Environment Engineering, Harbin Institute of Technology, Shenzhen 518055, China.
School of Mechanical Engineering and Automation, Harbin Institute of Technology, Shenzhen 518055, China.
Sensors (Basel). 2019 Apr 6;19(7):1642. doi: 10.3390/s19071642.
Grouted splice sleeve (GSS) connectors are mainly used in precast concrete structures. However, errors in manual operation during construction cause grouted defects in the GSS connector, which can lead to a negative effect on the overall mechanical properties of the structures. Owing to the complex structure of precast concrete members with a GSS connector, it is difficult to detect grouted defects effectively using traditional ultrasonic parameters. In this paper, a wavelet packet analysis algorithm was developed to effectively detect grouted defects using the ultrasonic method, and a verified experiment was carried out. Laboratory detection was performed on the concrete specimens with a GSS connector before grouting, in which the grouted defects were mimicked with five sizes in five GSS connectors of each specimen group. A simple and convenient ultrasonic detection system was developed, and the specimens were detected. According to the proposed grouted defect index, the results demonstrated that when the grouted defects reached certain sizes, the proposed method could detect the grouted defects effectively. The proposed method is effective and easy to implement at a construction site with simple instruments, and so provides an innovative method for grouted defects detection of precast concrete members.
预埋灌浆套筒（GSS）连接器主要用于预制混凝土结构。然而，在施工过程中手动操作的失误会导致 GSS 连接器中的灌浆缺陷，这可能对结构的整体力学性能产生负面影响。由于具有 GSS 连接器的预制混凝土构件的结构复杂，因此很难使用传统的超声参数有效地检测灌浆缺陷。本文提出了一种小波包分析算法，利用超声法有效地检测灌浆缺陷，并进行了验证实验。在灌浆前对带有 GSS 连接器的混凝土试件进行了实验室检测，在每个试件组的五个 GSS 连接器中模拟了五种尺寸的灌浆缺陷。开发了一种简单方便的超声检测系统，并对试件进行了检测。根据提出的灌浆缺陷指标，结果表明，当灌浆缺陷达到一定尺寸时，该方法可以有效地检测到灌浆缺陷。该方法使用简单的仪器在施工现场实施有效且方便，为预制混凝土构件的灌浆缺陷检测提供了一种创新方法。
