Publication Date:
2023-03-20
Description:
Here, an avant-garde study of three ancient Doric columns of the precious, ancient Romanesque
church of Saints Lorenzo and Pancrazio in the historical town center of Cagliari (Italy)
is presented based on the integrated application of different non-destructive testing methods. The
limitations of each methodology are overcome by the synergistic application of these methods,
affording an accurate, complete 3D image of the studied elements. Our procedure begins with a
macroscopic in situ analysis to provide a preliminary diagnosis of the conditions of the building
materials. The next step is laboratory tests, in which the porosity and other textural characteristics of
the carbonate building materials are studied by optical and scanning electron microscopy. After this,
a survey with a terrestrial laser scanner and close-range photogrammetry is planned and executed
to produce accurate high-resolution 3D digital models of the entire church and the ancient columns
inside. This was the main objective of this study. The high-resolution 3D models allowed us to
identify architectural complications occurring in historical buildings. The 3D reconstruction with
the above metric techniques was indispensable for planning and carrying out the 3D ultrasonic
tomography, which played an important role in detecting defects, voids, and flaws within the body
of the studied columns by analyzing the propagation of the ultrasonic waves. The high-resolution
3D multiparametric models allowed us to obtain an extremely accurate picture of the conservation
state of the studied columns in order to locate and characterize both shallow and internal defects in
the building materials. This integrated procedure can aid in the control of the spatial and temporal
variations in the materials’ properties and provides information on the process of deterioration in
order to allow adequate restoration solutions to be developed and the structural health of the artefact
to be monitored.
Description:
Published
Description:
3098
Description:
5T. Sismologia, geofisica e geologia per l'ingegneria sismica
Description:
JCR Journal
Keywords:
close-range photogrammetry
;
terrestrial laser scanner
;
3D digital models
;
3D ultrasonic tomography
;
petrographic analyses
;
carbonate materials
;
05.04. Instrumentation and techniques of general interest
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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