Abstract
High moisture content is a common problem of adhered glazed ceramic cladding. It leads to further problems such as biological growth, delamination and efflorescence. Increased moisture also affects users' indoor comfort and more energy is needed for heating due to higher thermal conductivity. Therefore, it is useful to detect it before visible signs occur and this is possible with infrared thermography. A quasi-quantitative approach based on time-dependent infrared thermographic inspection and thermogram analysis by quantitative methods was tested in an adhered ceramic facade where rising damp had already been identified. Simple image subtraction (SIS), nonnegative matrix factorization (NMF) and principal component analysis (PCA) were the quantitative methods tested for the analysis of thermograms. Hammer-tapping control and surface moisture measurements were the auxiliary techniques used to assess the results. Comparative assessments showed that the quasi-quantitative approach using PCA has great potential to detect changes in moisture and also to eliminate false indications caused by unavoidable reflection and shading. The results obtained by SIS and NMF on the other hand, had limited performance in showing areas with high moisture content.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
