scholarly journals Control del proceso de deshumidificación de muros con georradar. Un edificio patrimonial como caso de estudio

2014 ◽  
Vol 4 (1) ◽  
pp. 74-83 ◽  
Author(s):  
Susana B. Gea ◽  
R. Quinteros ◽  
L. Nallim
Keyword(s):  
Physical System ◽  
Historical Buildings ◽  
El Sistema ◽  
High Investment ◽  
Non Destructive ◽  
The Church ◽  
Harmful Effects ◽  
Rising Damp

RESUMENEn edificios históricos son conocidos los efectos nocivos de la presencia de humedad en muros, que deteriora detalles de ornamentación, conjuntamente con los componentes de la mampostería que conforma su propia estructura. Es el caso de la Iglesia Nuestra Señora de la Viña (Salta, Argentina), edificio del s. XIX que presentaba manifestaciones patológicas características de las producidas por la presencia de humedad ascendente. Las tareas de recuperación de las superficies exteriores fueron realizadas una vez que el sistema instalado (por electrólisis) deshumidificó los muros. La elevada inversión realizada requiere de un control periódico de la eficacia del sistema. En este trabajo se presentan los fundamentos y los resultados obtenidos con el empleo de georradar como recurso no destructivo para controlar el sistema de deshumidifación, cuya principal ventaja es la de poder detectar en forma precoz a lo largo del tiempo alguna falla en el sistema, evitando en forma indefinida la aparición de nuevas manifestaciones patológicas por humedad ascendente.Palabras clave: patología; mampostería; humedad; radar.ABSTRACTIn historical buildings the harmful effects in masonry due to moisture are well known, as it affects ornamentation and the components of the masonry which is also the building’s structure. That is the case of the church Nuestra Señora de la Viña (Salta, Argenti na), a XIX cent. building which presented typical pathological symptoms caused by rising damp. An electro physical system was installed in order to dehumidificate the masonry and external surfaces were subsequently recovered. This high investment requires a periodical control of the system’s efficiency. This article presents the foundations of and the results obtained by using an impulse radar as a non-destructive resource to control the dehumidification system. Its main advantage is the early detecting of a failure in the system and so avoiding new pathological symptoms caused by rising damp.Keywords: Pathology masonry; moisture; radar.

scholarly journals GPR and IRT Tests in two Historical Buildings in Gravina in Puglia

2016 ◽  
Author(s):  
Loredana Matera ◽  
Raffaele Persico ◽  
Edoardo Geraldi ◽  
Maria Sileo ◽  
Salvatore Piro
Keyword(s):  
Southern Italy ◽  
Historical Buildings ◽  
Santa Croce ◽  
Stepped Frequency ◽  
Santa Maria ◽  
The Church

Abstract. This paper describes a noninvasive investigation conducted in two important churches, namely the Cathedral of Santa Maria Assunta and the church Santa Croce, both placed in Gravina in Puglia (close to Bari, southern Italy). The church of Santa Croce, now deconsecrated, lies below the Cathedral. Therefore, indeed the two churches constitute a unique building body. Moreover, below the church of Santa Croce there are several crypts, only partially known. The prospecting was performed both with a pulsed commercial GPR system and with a prototypal reconfigurable stepped frequency system. The aim was twofold, namely to achieve some information about the monument and to test the prototypal system. The GPR measurements have been also integrated with an IRT investigation performed on part of the vaulted ceiling of the church of Santa Croce, in order to confirm or deny a possible interpretation of some GPR results.

scholarly journals Development of a three-dimensional hygrothermal model of a historic building in WUFI®Plus vs EnergyPlus

2019 ◽  
Vol 282 ◽  
pp. 02079
Author(s):  
Guilherme B. A. Coelho ◽  
Hugo Entradas Silva ◽  
Fernando M. A. Henriques
Keyword(s):  
Three Dimensional ◽  
Building Envelope ◽  
Water Vapour Pressure ◽  
Mechanical Degradation ◽  
Indoor Climate ◽  
Outdoor Climate ◽  
Key Factor ◽  
Indoor Conditions ◽  
Non Destructive ◽  
The Church

Historic artefacts are crucial to transmit history to future generations. Depending on the characteristics of their components these objects can be prone to biological attacks, chemical decay or even mechanical degradation. These three types of decay are induced by the indoor relative humidity and temperature, which are largely dependent on the characteristics of the building envelope, the outdoor climate and the number of occupants. In order to attain a proper indoor climate for the conservation of the artefacts it may be necessary to implement some types of changes. However, and due to the high heritage value of most of the buildings that house these artefacts, any type of changes has to be thoroughly studied prior to its implementation. These studies are usually carried out using a hygrothermal model of the building validated by the measured indoor conditions. The development of these models is entirely based on non-destructive procedures, which is a key factor when studying historic buildings. The yearly indoor climate of a 13th century church in Lisbon was measured and then used to develop a hygrothermal model of the church in two of the most used software in cultural heritage: EnergyPlus and WUFI®Plus. The obtained results for each model were compared against the measured indoor temperature and water vapour pressure to determine which are the advantages of the two software.

High Resolution 3D modelling of Cylinder shape bodies applied to 1000 ancient BC columns

2020 ◽  
Author(s):  
Giuseppe Casula ◽  
Silvana Fais ◽  
Francesco Cuccuru ◽  
Maria Giovanna Bianchi ◽  
Paola Ligas
Keyword(s):  
High Resolution ◽  
Building Materials ◽  
Laser Scanner ◽  
3D Modelling ◽  
Ultrasonic Tomography ◽  
Terrestrial Laser Scanner ◽  
Non Destructive Testing ◽  
Historical Buildings ◽  
Destructive Testing ◽  
Non Destructive

<p>A multi-technique high resolution 3D modelling is described here aimed at the investigation of the state of conservation of carbonate columns of the 1000 BC ancient church of Buon Camino located in the homonymous district of the town of Cagliari (Italy).</p><p>The integrated application of different Non-Destructive Testing (NDT) diagnostic methods is of paramount importance to locate damaged parts of the building material of artefacts of historical buildings and to plan their restoration.</p><p>In this study a multi-step procedure was applied starting with a high resolution 3D modelling performed with the aid of Structure from Motion (SfM) Photogrammetry and Terrestrial Laser Scanner (TLS) methodologies. For this delicate task we operated simultaneously a Nikon D-5300 digital Reflex 24.2 Mega pixel Camera and a Leica HDS-6200 Terrestrial Laser Scanner. Subsequently, starting from the information detected with the above methods deeper material diagnostics was performed by means of high resolution 3D ultrasonic tomography aimed at the capillary definition of the elastic properties in the inner parts of the building materials. Measurements of longitudinal wave velocity from ultrasonic data were performed using the transmission method, namely two piezoelectric transducers coupled on the opposite sides of the investigated columns. The ultrasonic data acquisition was planned designing an optimal survey and providing a very good spatial coverage of the investigated columns. The columns were then criss-crossed by a large number of ray paths forming a dense 3D net. The SIRT (Simultaneous Iterative Reconstruction Tomography) algorithm was used to produce the 3D rendering of the velocity distribution inside the investigated columns. With this method the damaged parts were located and it was possible to distinguish them from the unaltered areas. The information on the superficial material conditions obtained by SfM and TLS techniques were compared and integrated with the information of the inner materials obtained by 3D ultrasonic tomography.</p><p>The results of the above non invasive geophysical techniques have been interpreted in the light of the different textural and petrophysical features of the study carbonate building materials. The study of the main textural features, such as the relationship between bioclasts, carbonate matrix, or that of the cement and petrophysical characteristics such as the nature and distribution of porosity were found to be of fundamental importance in the interpretation of the geophysical data (e.g. TLS reflectance and longitudinal acoustic wave propagation). Therefore a detailed analysis of the textures and pore microstructure were carried out from petrographic thin-sections in Optical and Scanning Electron Microscopy (OM/SEM). The final result of our multi-step-technique integrated methodology is a sophisticated 3D model with a high resolution 3D image representing the internal and external parts of the investigated columns in order to account for their static load resistance and possibly plan their conservation and restoration. The described procedure can also be applied to other cases in which a diagnosis is needed of the state of conservation of the variously shaped, layered-stones and composed artefacts typical of ancient historical buildings.</p><p>Key words: 3D Modelling, 3D Ultrasonic Tomography, Terrestrial Laser Scanner, SfM Photogrammetry, Non-Destructive Testing, Diagnostic, Ancient Columns, Stones</p>

scholarly journals Treatment of rising damp in historical buildings: wall base ventilation

2007 ◽  
Vol 42 (1) ◽  
pp. 424-435 ◽  
Author(s):  
M. Isabel M. Torres ◽  
Vasco Peixoto de Freitas
Keyword(s):  
Historical Buildings ◽  
Rising Damp

scholarly journals Non-destructive analyses of defects and effects of airborne pollutants in historical buildings

2006 ◽  
Author(s):  
C. Bonifazzi ◽  
G. Maino ◽  
S. Massari ◽  
L. Roversi ◽  
C. Selvatici ◽  
...  
Keyword(s):  
Historical Buildings ◽  
Airborne Pollutants ◽  
Non Destructive

scholarly journals Safe Documentation of Historical Monuments by an Autonomous Unmanned Aerial Vehicle

2021 ◽  
Vol 10 (11) ◽  
pp. 738
Author(s):  
Vít Krátký ◽  
Pavel Petráček ◽  
Tiago Nascimento ◽  
Michaela Čadilová ◽  
Milan Škobrtal ◽  
...  
Keyword(s):  
Unmanned Aerial Vehicle ◽  
Three Dimensional ◽  
Laser Scanner ◽  
Robotic Systems ◽  
Historical Buildings ◽  
The Czech Republic ◽  
Aerial Vehicles ◽  
Historical Monuments ◽  
Aerial Vehicle ◽  
The Church

The use of robotic systems, especially multi-rotor aerial vehicles, in the documentation of historical buildings and cultural heritage monuments has become common in recent years. However, the teleoperated robotic systems have significant limitations encouraging the ongoing development of autonomous unmanned aerial vehicles (UAVs). The autonomous robotic platforms provide a more accurate and safe measurement in distant and difficult to access areas than their teleoperated counterpart. Through the use of autonomous aerial robotic systems, access to such places by humans and building of external infrastructures like scaffolding for documentation purposes is no longer necessary. In this work, we aim to present a novel autonomous unmanned aerial vehicle designed for the documentation of hardly attainable areas of historical buildings. The prototype of this robot was tested in several historical monuments comprising scanned objects located in dark and hardly accessible areas in the upper parts of tall naves. This manuscript presents the results from two specific places: the Church of St. Anne and St. Jacob the Great in Stará Voda, and St. Maurice Church in Olomouc, both in the Czech Republic. Finally, we also compare the three-dimensional map obtained with the measurements made by the 3D laser scanner carried onboard UAV against the ones performed by a 3D terrestrial laser scanner.

The Church of the Nativity in Bethlehem: Non-destructive tests for the structural knowledge

2012 ◽  
Vol 13 (4) ◽  
pp. e27-e41 ◽  
Author(s):  
Giuseppe Faella ◽  
Giorgio Frunzio ◽  
Mariateresa Guadagnuolo ◽  
Alfonso Donadio ◽  
Luca Ferri
Keyword(s):  
Structural Knowledge ◽  
Non Destructive ◽  
The Church

Quantum theory, the Church–Turing principle and the universal quantum computer

1985 ◽  
Vol 400 (1818) ◽  
pp. 97-117 ◽  
Keyword(s):  
Quantum Theory ◽  
Complexity Theory ◽  
Turing Machine ◽  
Physical System ◽  
Quantum Computer ◽  
Physical Principle ◽  
Universal Turing Machine ◽  
Universal Quantum ◽  
Computing Machines ◽  
The Church

It is argued that underlying the Church–Turing hypothesis there is an implicit physical assertion. Here, this assertion is presented explicitly as a physical principle: ‘every finitely realizible physical system can be perfectly simulated by a universal model computing machine operating by finite means’. Classical physics and the universal Turing machine, because the former is continuous and the latter discrete, do not obey the principle, at least in the strong form above. A class of model computing machines that is the quantum generalization of the class of Turing machines is described, and it is shown that quantum theory and the 'universal quantum computer’ are compatible with the principle. Computing machines resembling the universal quantum computer could, in principle, be built and would have many remarkable properties not reproducible by any Turing machine. These do not include the computation of non-recursive functions, but they do include ‘quantum parallelism’, a method by which certain probabilistic tasks can be performed faster by a universal quantum computer than by any classical restriction of it. The intuitive explanation of these properties places an intolerable strain on all interpretations of quantum theory other than Everett’s. Some of the numerous connections between the quantum theory of computation and the rest of physics are explored. Quantum complexity theory allows a physically more reasonable definition of the ‘complexity’ or ‘knowledge’ in a physical system than does classical complexity theory.

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