Experimental study on grout defects detection in precast shell wall based on wavelet packet analysis

Due to construction problems, grout defects always exist in precast structure with rebars spliced by sleeves. However, research on grout defects detection faces great challenges owing to the complexity of the problem. This study presents a nondestructive grout defects detection method based on wavelet packet analysis. First, experiment is carried out on two precast shell walls, then, acceleration responses are analyzed, and defects detection indexes ERVD and ERVDs are proposed. The results show that ERVDs is more sensitive to the grout defects than ERVD, and can be used as a good defect detection index in prefabricated shear wall.