scholarly journals Research on the Organic Binders in Archaeological Wall Paintings

2021 ◽  
Vol 11 (19) ◽  
pp. 9179
Author(s):  
Antonella Casoli

Wall painting realized using organic binders is the oldest form of parietal painting and precedes the birth of the affresco by about 20,000 years. This paper reports the results obtained from the main studies in the field of archaeological wall paintings. The attention was paid to the study of organic binders used for the application of the color, as well as on the instrumental techniques chosen to obtain such information. Different techniques can be used for the study of organic material in archeological paintings: non-destructive techniques, which can be applied directly in situ without sampling, and laboratory micro-invasive techniques for a more in-depth characterization. Among these, the chromatographic techniques represent a potential tool to acquire as much information as possible about chemical composition of binders.

2013 ◽  
Vol 778 ◽  
pp. 167-174 ◽  
Author(s):  
Beatrice Faggiano ◽  
Maria Rosaria Grippa ◽  
Bruno Calderoni

In the context of a more wide research study for in situ mechanical identification of ancient timber structures by non-destructive techniques, the paper illustrates the experimental activity developed on structural elements made of old chestnut timber, 4x4x76 cm size: 24 squared specimens were extracted by six elements in actual dimensions, already used in a previous tests campaign. Non-destructive (ND: hygrometric, sclerometric and resistographic) and destructive (D: bending) tests were performed, the latter according to UNI EN 408 (2004) standard, in order to assess the mechanical properties and the collapse mechanisms of chestnut timber. Data gathered are presented in detail and, NDT-DT correlations, obtained through a linear regression approach, are provided to predict wood density, strength and modulus of elasticity of the tested members.


2003 ◽  
Vol 480 (2) ◽  
pp. 317-325 ◽  
Author(s):  
Alessandra Perardi ◽  
Lorenzo Appolonia ◽  
Piero Mirti

Author(s):  
Nagore Prieto‐Taboada ◽  
Silvia Fdez‐Ortiz de Vallejuelo ◽  
Anne Santos ◽  
Marco Veneranda ◽  
Kepa Castro ◽  
...  

Author(s):  
Monica Salvadori ◽  
Clelia Sbrolli

AbstractThis paper aims at presenting an overview of Roman wall painting production between late Republic and the early Empire. It will focus on the technique and style of in situ wall paintings from the Vesuvian area (Italy). Frescoes are indeed an integral part of architecture and reflect the patrons’ ambitions and social level as well as the craftsmen’s technical know-how. Since this is a handicraft product, the quality of materials, the craftsmen’s skills and the technique are fundamental to understand the fresco’s value and the message that the patron wished to communicate through the use of elaborate schemes, expensive colours or certain mythological themes.


2021 ◽  
Author(s):  
Giuseppe Casula ◽  
Silvana Fais ◽  
Francesco Cuccuru ◽  
Maria Giovanna Bianchi ◽  
Paola Ligas ◽  
...  

<p>The diagnosis of the conservation state of monumental structures from constraints to the spatial distribution of their physical properties on shallow and inner materials represents one of the key objectives in the application of non-invasive techniques. <em>In situ</em>, CRP and 3D ultrasonic tomography can provide an effective coverage of stone materials in space and time. The intrinsic characteristics of the materials that make up a monumental structure and affect the two properties (i.e., reflectivity, longitudinal velocity) through the above methods substantially differ. Consequently, the content of their information is mainly complementary rather than redundant.</p><p>In this study we present the integrated application of different non-destructive techniques i.e., Close Range Photogrammetry (CRP), and low frequency (24 KHz) ultrasonic tomography complemented by petrographycal analysis based essentially on Optical Microscopy (OM). This integrated methodology has been applied to a Carrara marble column of the <em>Basilica of San Saturnino</em>, in Byzantine-Proto-Romanesque style, which is part of the Paleo Christian complex of the V-VI century. This complex also includes the adjacent Christian necropolis in the square of <em>San Cosimo</em> in the city of Cagliari, Sardinia, Italy. The column under study is made of bare material dating back probably to the first century A.D., it was subjected to various traumas due to disassembly and transport to the site, including damage caused by the close blast of a WWII fragmentation bomb.</p><p>High resolution 3D modelling of the studied artifact was computed starting from the integration of proximal sensing techniques such as CRP based on Structure from Motion (SfM), with which information about the geometrical anomalies and reflectivity of the investigated marble column surface was obtained. On the other hand, the inner parts of the studied body were successfully inspected in a non-invasive way by computing the velocity pattern of the ultrasonic signal through the investigated materials using 3D ultrasonic tomography. This technique gives information on the elastic properties of the material related with mechanical properties and a number of factors, such as presence of fractures, voids, and flaws. Extracting information on such factors from the elastic wave velocity using 3D tomography provides a non-invasive approach to analyse the property changes of the inner material of the ancient column. The integrated application of <em>in situ</em> CRP and ultrasonic techniques provides a full 3D high resolution model of the investigated artifact. This model enhanced by the knowledge of the petrographic characteristics of the materials, improves the diagnostic process and affords reliable information on the state of conservation of the materials used in the construction processes of the studied monumental structure. The integrated use of the non-destructive techniques described above also provides suitable data for a possible restoration and future preservation.</p><p><strong> </strong></p><p><strong>Acknowledgments: </strong>This work was partially supported by FIR (Fondi integrativi per la Ricerca) funded by the University of Cagliari (Italy). The authors would also like to thank the Ministero dei Beni e delle Attività Culturali. Polo Museale della Sardegna and Arch. Alessandro Sitzia for their kind permission to work on the <em>San Saturnino Basilica</em>.</p>


Author(s):  
Juan Antonio Martínez Hermoso ◽  
María José Ayora Cañada ◽  
Ana Domínguez Vidal ◽  
◽  

The chapel of the QH31 funerary complex (Sarenput II) was excavated directly into the rock, like the rest of the hypogea of the necropolis of Qubbet el-Hawa. However, in the chapel there are some outstanding elements that, probably, were elaborated independently of the excavation works in situ, to be located in the planned place as an integral part of the burial equipment, and the general design of the chapel. These elements include, for example, the three pairs of Osiride statues in the corridor, the four pillars in the offering chamber, and the slabs with which they built the sanctuary of the statue of the grave’s owner. As these elements were found coated so as to make their surfaces suitable for decoration, it is very difficult to determine the stone with which they were made. During the last campaign (2018), in situ analysis with non-invasive techniques, such as X-ray Fluorescence, has allowed determining its chemical composition. In addition, some stone fragments found during the excavations carried out since 2008 by the Qubbet el-Hawa project (University of Jaén), have been analyzed, such as the wig of the decapitated statue on the north wall of the corridor, and the fragment belonging to the right jamb of the façade of the sanctuary housing the statue. The results of the analysis seem to indicate that these elements were made from a very similar sandstone to that of the excavation itself and not with silicified sandstone (quartzarenite), which was also very abundant at Qubbet el-Hawa. Besides, these studies show several differences in composition between the stone employed for the construction of the sanctuary, and other elements such as the Osiride statues. Finally, the slab on the floor of the sanctuary, on which the statue of Sarenput was placed, was made of imported limestone.


2016 ◽  
Vol 711 ◽  
pp. 737-744
Author(s):  
Radu Pascu ◽  
Dan Paul Georgescu ◽  
Adelina Apostu

Performance of RC members is tightly closed to their environment. A long exposition time in aggressive environment corresponds frequently with the use of RC elements designed and produced in an epoch when technical norms, reflecting the knowledge level of the time, were insufficient to insure the durability of the elements.This paper presents the assessment of precast flooring units after 40 years of exposition in an aggressive industrial environment, specific to the steel industry. The assessment was performed using chemical and mechanical tests performed in situ and in the laboratory, using destructive as well as non-destructive techniques, applied at material and member level. Experimental methods were corroborated with calculation results.The paper presents also the steps which were taken in order to asses the performance of the concrete structural elements.The results of this study allow concluding about the causes which led to the observed damage and the identification of the remedial measures needed to restore the security of the investigated elements.


Sign in / Sign up

Export Citation Format

Share Document