![]() ![]() studied a noncontact vision-based sensing method with which cracks in a full-scale reinforced concrete slab could be detected through image analysis. The comparison between 3D finite element simulation and actual reinforced concrete bridge decks’ measurements was reported with an average error of 10%–15%. An extended Surface Wave Transmission (SWT) method to characterize the depths of surface-breaking cracks in concrete bridge was previously carried out by Kee and Gucunski. ![]() developed a Stack Imaging of spectral amplitudes Based on Impact-Echo (SIBIE) method to identify the presence of voids in delaminated areas and evaluate the depth of surface cracks. ![]() However, for smaller crack (0.1–0.5 mm) detection, addition of adding water was required. It was concluded that the FT is able to detect surface cracks with widths between 0.5 mm and 1 mm. proposed a contactless short-duration pulsed thermography Flash Thermography (FT) method for surface crack detection. Numerous studies have been conducted to assess surface breaking cracks in concrete. Severe cracking often affects serviceability and the integrity of a structure. Cracks are normally formed due to one or a combination of factors such as drying shrinkage, thermal contraction, restraint (external or internal) to shortening, subgrade settlement, and applied loads. Civil structures are susceptible to various kinds of defects such as cracking, spalling, creeping, honeycombing, voids and delamination of cover. ![]()
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