Search results for " Geologia"
showing 10 items of 570 documents
Unsaturated sand in the stability of the cuesta of the Temple of Hera (Agrigento)
2013
In the Valle dei Templi in Agrigento seven Doric temples stand lengthwise the crest of a rigid calcarenite cuesta over a layer of carbonate sand which lies along a thick stratum of clays. The environment is highly prone to landslides since topplings of calcarenite blocks often occur. The rock slopes are moving back and the slope edge draw near to the foundation of the Temple of Hera Lacinia contributing to increase their perilous condition. To assess the role of unsaturated sands in the instability processes, after the compositional and textural analysis of the material, direct shear tests and oedometer tests have been carried out on sand samples initially at the natural state, with low or …
La caratterizzazione delle malte dell'acquedotto Cornelio di Termini Imerese
2008
Calcestruzzi delle Aviorimesse per Idrovolanti di Pier Luigi Nervi a Marsala (1940-41). Composizione e Tessitura
2008
L'uso del Gesso nelle Costruzioni del Vallo di Mazara in Sicilia
2008
The "Fossa della Garofala" in Palermo: a geological site rich in cultural heritage
2008
The Fossa della Garofala is a short, narrow valley, enclosed by sub-vertical banks, which was carved out by the Kemonia creek on the calcarenitic table that makes up the bedrock of the Plain of Palermo. It forms the outermost hem of the Conca d’Oro landscape where, set in an urban area, geologic and geomorphologic features of value join historical cultural values dating from the Punic period to the XIX century. This combination places the entire area in one of the most significant, albeit little known, pages of history: the history of traditional suburban landscape. This rare synthesis of natural and anthropic landscapes offers the opportunity to create theme itineraries of great cultural a…
Characterization of serpottas' stuccos by means of simultaneous thermal analysis: Preliminary results
2015
In this paper the Simultaneous Thermal Analysis (STA), i.e. thermogravimetric and differential thermal analysis, was used as a diagnostic tool to better understand the matter composition of some very valuable artworks the Serpottas’ stuccoes in Palermo. Particularly the STA was used in order to exclude the presence of an unusual calcium-bearing magnesium carbonate, and the thermal data were also used to quantify the magnesite to calcite ratio. The latter was investigated in order to evaluate the amount of magnesium in the lime used as binder as during 17th and 18th century in Sicily magnesium rich lime was indicated as the most valuable binder probably because this kind of lime has a higher…
Le aviorimesse di Pierluigi Nervi a Marsala: correlazioni tra le diverse modalità di esecuzione e lo stato di conservazione
2009
This work deals with the composition and the state of conservation of the concrete of two hangars designed and built by Pier Luigi Nervi in 1940-1941. The interest in this project is related both to the use of on site prefabrication for so large structures (45x55 m plan) and to some peculiarities of the mix design, in particular the aggregate/binder ratio and the lithological composition of the aggregates. The study has been performed by means of X ray diffractometry, optical microscopy in trasmitted light on thin sections, ionic chromatography and carbonation tests. The twofold aim is to assess the conservation condition of concrete after 67 years of ageing in a marine spray environment an…
Mortars and Plasters under the Mosaics and the Wall Paintings of the Roman Villa at Piazza Armerina, Sicily
2010
The Roman Villa at Piazza Armerina in Sicily, built in many successive steps over the 2nd and 3rd centuries A.D., is renowned all over the world for both the wealth and the refinement of its mosaic floors. In February 2007 the Regional Government of Sicily started a restoration project of the whole archaeological site. The systematic survey and study of all decorative elements highlighted the value of wall paintings, which until then were almost unknown except for casual approaches to specific problems of conservation, carried on without any relation to the far and away famous mosaics. This paper shows the results of a physical chemical investigation of the mortars used for both floors and …
Assesment of the Conservation State of Stone Materials in Relation to the Level Environmental Pollution in the Conservation Place
2007
The patina represents a superficial natural alteration of the constituting matter of the work of art. It emerges from the natural and usual stabilization process that the materials of the surface undergo because of the interaction with outdoor agents characterizing the surrounding environment. Besides, it is not linked to an obvious phenomenon of degradation that can be noticed through the change in the original colour of the matter. This is what we intend when we talk about biological patina usually generated by macro and/or micro-organic colonization (fungi, bacteria, alga) which contributes to surface bio-deterioration and thus lead to the formation of orange, red or even brown and dark …
Composizione, tessitura ed efficienza delle malte degli acquedotti Romani Cornelio e Figurella
2008
Nell’ambito della conservazione dei beni culturali lo studio delle malte idrauliche a base di calce aerea rappresenta un tema di grande interesse per la complessità e la varietà dei materiali utilizzati e per l’importanza che hanno ri- vestito nella storia delle tecniche costruttive, grazie alle loro elevate prestazioni meccaniche e alla loro durabilità. L’Acquedotto Cornelio di Termini Imerese in Sicilia rappresenta un interes- sante esempio di costruzione idraulica, nella quale queste malte furono utiliz- zate sia per rivestire i condotti con strati impermeabilizzanti sia per conferire resistenza meccanica agli elementi strutturali. Un ulteriore elemento di interesse sta nella sua comples…