Abstract
The capability of active thermographic nondestructive inspection of concrete is influenced by the concrete testing condition. In this study, the influence of concrete composition and surface discoloration caused by efflorescence is investigated. Experiments performed on the concrete specimens under various conditions indicate that active thermography is barely affected by the variation in the concrete composition. This feature makes active thermography a practical tool for inspecting concrete structures with coarse aggregates. Furthermore, it is observed that the surface discoloration caused by efflorescence enhances the surface reflectance in the wavelength range of a halogen lamp. This leads to a reduction in inspection capability owing to heat input reduction. Based on the results, the active thermography method is unsuitable for concrete with great efflorescence.
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