Publication Date:
2022-06-07
Description:
The diagnostic process on the cultural heritage by non-invasive multi techniques generates
multiple volumes of different data sets. Such volumes can be applied to a whole range of
problems from diagnostics of the building stone materials to their in-time monitoring for
maintenance and conservation. The results of the diagnostic process in multimodal data sets can
be rendered effective by comparing multiple volumes at the same time and over time since the
safety of monumental structures requires periodic monitoring. As already shown in recent works
that focused on the integration of heterogeneous data from complementary techniques, the use
of a single technique is generally insufficient to obtain a reliable diagnostic process.
The multi-technique high resolution 3D models described in this paper was aimed to investigate
the conservation state of a precious carbonate colonnade in the ancient church of Saints Lorenzo
and Pancrazio, dating to about the second half of the thirteenth century and located in the old
town of Cagliari (Italy). The diagnostics of the carbonate colonnade was made by 3D non-invasive
multi-techniques, i.e. Terrestrial Laser Scanner (TLS), close range photogrammetry (CRP) and
ultrasonic tomography supported by petrographic investigations. To obtain a natural colour
texturized 3D model of the columns with calibrated scale and coordinates both the TLS and CRP
techniques were applied. The geometrical anomaly and reflectivity maps derived from the data of
the TLS-CRP survey show presence of some anomalies worthy of attention. The 3D reconstruction
with previous techniques was the essential base for the planning and execution of the 3D
ultrasonic tomography that played an important role in detecting internal defects and voids and
flaws within the materials by analysing the propagation of ultrasonic waves.
The results of the non-invasive diagnostic techniques on the building carbonate materials of the
ancient colonnade were supported by thin section and mercury intrusion porosimetry (MIP)
analyses in order to study their porosity and other textural characteristics such as the grainsmatrix
or grains-cement relationships, the bioclasts packing, the pore network and other
petrophysical parameters (i.e. permeability and tortuosity). Knowledge of these characteristics is
key to understanding the different susceptibility of the building carbonate materials to
degradation and recognizing any forms of degradation while providing fundamental support to
the interpretation of the geophysical data.
Description:
Published
Description:
Vienna - Austria
Description:
5T. Sismologia, geofisica e geologia per l'ingegneria sismica
Keywords:
Diagnostic Process
;
Cultural Heritage
;
Non-Invasive Multi Techniques
;
Terrestrial Laser Scanner
;
Close Range Photogrammetry
;
Ultrasonic Tomography
;
Petrographic Investigations
;
Diagnostic process on the cultural heritage by non-invasive multi techniques
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
Abstract
Permalink
