Nondestructive testing: use of IR and acoustics methods in buildings pathology

Walter Esposti; Italo Meroni

doi:10.1117/12.204879

28 March 1995 Nondestructive testing: use of IR and acoustics methods in buildings pathology

Walter Esposti, Italo Meroni

Proceedings Volume 2473, Thermosense XVII: An International Conference on Thermal Sensing and Imaging Diagnostic Applications; (1995) https://doi.org/10.1117/12.204879
Event: SPIE's 1995 Symposium on OE/Aerospace Sensing and Dual Use Photonics, 1995, Orlando, FL, United States

Abstract

In the paper the authors present some experiences made using IR and acoustics methods in a non destructive way for the evaluation of situations of degradation in building materials and components. Two studies are presented: (1) detection of the delamination of wall renderings, especially those supporting frescos, by means of IR and sonic investigation; (2) use of infrared thermography for the visualization of fracture zones of walls and steel components under cyclic loads. The possibility of detecting rendering delaminations is based on the different path of the heat diffusion in part of the wall affected by the delamination, compared to the rest of the wall. The difference is caused by the presence of small pockets containing still air. The case study showed makes reference to the analysis of adhesion conditions of a rendering dating back to the IV century, applied on the bell towers of the ancient basilica dedicated to S. Lorenzo in Milan, Italy. The use of infrared thermography for detecting the strength status of materials and components is based on the fact that the strength status of parts of building components can become evident because of heat losses which appear where the component is weaker. The IR observation was made on steel bars subject to traction testing and on lightweight concrete prismatic samples subject to compression testing. The experiences indicate that there is room for this NdT technique to provide some useful answers. Nevertheless it is sure that more experimental work is needed in order to increase the full comprehension of the phenomena which are the basis of their applications for alternative uses.

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Walter Esposti and Italo Meroni "Nondestructive testing: use of IR and acoustics methods in buildings pathology", Proc. SPIE 2473, Thermosense XVII: An International Conference on Thermal Sensing and Imaging Diagnostic Applications, (28 March 1995); https://doi.org/10.1117/12.204879

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KEYWORDS

Thermography

Buildings

Acoustics

Nondestructive evaluation

Infrared radiation

Pathology

Diffusion

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