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Reference free imaging of subsurface cracks in concrete using R ayleigh waves
Author(s) -
Ghosh Debdutta,
Beniwal Surendra,
Ganguli Abhijit,
Mukherjee Abhijit
Publication year - 2018
Publication title -
structural control and health monitoring
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.587
H-Index - 62
eISSN - 1545-2263
pISSN - 1545-2255
DOI - 10.1002/stc.2246
Subject(s) - rayleigh wave , nondestructive testing , acoustics , wedge (geometry) , rayleigh scattering , ultrasonic sensor , materials science , concrete cover , cover (algebra) , transmitter , guided wave testing , surface wave , geology , structural engineering , optics , computer science , engineering , reinforced concrete , mechanical engineering , physics , telecommunications , channel (broadcasting) , quantum mechanics
Summary One of the major reasons of deterioration in reinforced concrete structures is cracking of the concrete cover. In contrast to bulk waves, ultrasonic Rayleigh waves are more sensitive to such near‐surface cracks. This paper presents an imaging technique for nondestructive evaluation of the concrete cover area using the scattered Rayleigh wave field. The proposed imaging methodology acts as a useful diagnostic tool to detect the existence of subsurface cracks in concrete. An added advantage of the technique is that it is reference free and does not require information regarding the pristine condition of the structure. A wedge‐based technique that maximizes the propagating Rayleigh wave amplitude in the concrete cover is developed. A variant of the synthetic aperture focusing technique (SAFT) named as Planar SAFT is used for imaging. The number of scanning points has been minimized by scanning with the transmitter and the receiver in tied‐together mode. Numerical simulations and experimental investigations are reported to demonstrate the capability and potential of the proposed technique.