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Author(s): Elton Bauer
Elier Pavón
Eva Barreira
Eliane Kraus De Castro
Title: Analysis of building facade defects using infrared thermography: Laboratory studies
Issue Date: 2016
Abstract: One of the main problems facing the inspection of facades by means of passive infrared thermography, in order to identify and evaluate defects or pathologies, is the definition of the most appropriate moment to perform the inspection. Most studies focus on the Delta-T value as a criterion for the identification and evaluation of defects. Nevertheless, the identification of defects will primarily depend on the heat flux, since the way defects appear on the thermogram is determined by their type and by the direction of the flux. This study set out to analyse this problem by studying the behavior of the Delta-T and contrast functions in defects in ceramic tiles and mortar. Accordingly, test samples were made with induced defects during the manufacturing process, to simulate the detachment problems that occur with ceramic tiles of different thicknesses and cracks of different depths. The test samples were assessed during direct and inverse heating cycles. The results showed that it is possible to detect differences in behavior when varying the thickness of the ceramic tiles and the depth of the cracks by considering the Delta-T and contrast functions. In consequence, the inspection moment should be defined according to the behavior of the gradient temperature, the type of the defect and the direction of the heat flux.
Subject: Engenharia civil, Engenharia civil
Civil engineering, Civil engineering
Scientific areas: Ciências da engenharia e tecnologias::Engenharia civil
Engineering and technology::Civil engineering
Document Type: Artigo em Revista Científica Internacional
Rights: restrictedAccess
Appears in Collections:FEUP - Artigo em Revista Científica Internacional

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