Non-destructive diagnostics techniques for historical buildings: methodological guidelines and operations protocols
Técnicas de diagnóstico no destructives para edificios históricos: guías metodológicas y protocolos de operación
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AuthorCrespo Cuesta, Marta
ABSTRACT: The aim of this End of Master Work is analysing the different methodologies and find out the most helpful norms to apply three specific non‐destructive techniques, namely: Active thermography, sonic pulse velocity test and ground penetrating radar for the detection and evaluation of decays in historic buildings, structures and elements.
Nowadays, there is not a recognized source of knowledge to consult in order to apply these techniques for historical architecture. Some recommendations are given by specialized institutions as RILEM (International Union of Laboratories and Experts in Construction Materials, Systems and Structures) or DGZfP (German Society for Non‐Destructive Testing). Some initiatives tried to standardize the test procedures with no great success. The application procedures are currently applied on‐site most of the time with personalized methods and applying modifications according to the limitations of each test project. Official universal standards do not cover the special cares of a historical element requires.
Therefore, a research about the most common procedures for active thermography, sonic pulse velocity test and ground penetration radar is compiled.
The available knowledge is very dispersed. The amount of case studies articles and reports provide vital information to improve the test efficiency and many experts are glad to share their real experience with these technologies with other professionals.
Diving into the literature and conversing with practitioners, it is noticeable the lack of standardization and the few standards that are applicable for building preservation, are usually not followed or even known. Why? Examining the available standards, it is clear the complexity of their structure. The limitations of their procedures invalid often their applicability on‐site, i.e. very complex calibration method which required specific equipment not offered out of the laboratory. Thus, the user finds other solutions to accomplish the test with relative success.
For on‐site application, recommendation guidelines are usually more complete that the proper standards, but still not sufficient to increase the efficiency of the tests.
Considering this report as an introduction to the three methodologies, there is still a lot of work to do in order to document and put together the isolated valuable information to improve the tests efficiency test on historical buildings.