- -

Alteration processes of geomaterials used on the pentagonal tower of Serravalle Castle (central-west Sardinia, Italy)

RiuNet: Institutional repository of the Polithecnic University of Valencia

Share/Send to

Cited by

Statistics

Alteration processes of geomaterials used on the pentagonal tower of Serravalle Castle (central-west Sardinia, Italy)

Show simple item record

Files in this item

dc.contributor.author Columbu, Stefano es_ES
dc.contributor.author Meloni, Paola es_ES
dc.coverage.spatial east=8.504472076892853; north=40.29715186310829; name=Via Canonico Gavino Nino, 08013 Bosa OR, Itàlia
dc.date.accessioned 2018-01-25T08:03:57Z
dc.date.available 2018-01-25T08:03:57Z
dc.date.issued 2015-10-16
dc.identifier.isbn 9788490483770
dc.identifier.uri http://hdl.handle.net/10251/95510
dc.description.abstract [EN] The pentagonal tower belong to medieval Serravalle castle area (81 m. above sea level), near the mouth of the Temo River. The castle is important medieval fortifications of Sardinia and was built in various stages. The oldest part was constructed by Marchesi Malaspina of Villafranca which arrived in Sardinia at the 12th century (1112-1121). The earliest fortification was the four corner towers about 10 m tall, linked by a thick wall. The pentagonal tower, located in the western corner of the boundary dates about 1330, probably was consisted of two storeys with wooden beams, now missing, and one stone one with a longitudinal arch. In the structure was used local volcanic rocks (i.e., pyroclastites) belonging to the Oligo-Miocenic volcanic cycle of Sardinia (32-11 Ma). According to De La Roche classification (1980), the pyroclastic rocks have a composition varying from dacite to rhyolite and show a porphyritic structure (I.P. from 10 to 20%) for phenocrystals of opaque (ilmenite, magnetite and/or titanomagnetite), plagioclase, ± biotite, and rare hornblend and quartz. Two main type of volcanics are present with different physical properties (porosity, density, etc.) and petro-volcanological characteristics (e.g., welding degree): cineritic pyroclastites, little welded, with average values of open porosity and bulk density of 36.3±2.6% and 1.50±0.07 g/cm3, respectively; lava-like ignimbrites, from medium to high welded, and average values of open porosity and bulk density of 22.5±5.9% and 1.99±0.15 g/cm3, respectively. As function of these different features and extremely heterogeneous, due to variable incidence of pumice, lithic- and crystal-clasts, the alteration is present mainly on volcanics with low welding and exposed to the sea-winds. Due to marine aerosol, salt efflorescences are present. These latter, together thermal and hydric cyclic dilatation, lead to various macroscopic physical alterations (decohesion, chromatic alteration, pitting, exfoliation, flaking, alveolation, differential degradation between the lithic-clasts and the vitreous matrix). es_ES
dc.format.extent 8 es_ES
dc.language Inglés es_ES
dc.publisher Editorial Universitat Politècnica de València es_ES
dc.relation.ispartof Defensive architecture of the mediterranean: XV to XVIII centuries. Vol. II es_ES
dc.rights Reconocimiento - No comercial - Sin obra derivada (by-nc-nd) es_ES
dc.subject Fortifications es_ES
dc.subject Mediterranean es_ES
dc.subject Modern age es_ES
dc.subject Built Heritage es_ES
dc.subject Tower fortification es_ES
dc.subject Decay es_ES
dc.subject Alteration es_ES
dc.subject Pyroclastites es_ES
dc.title Alteration processes of geomaterials used on the pentagonal tower of Serravalle Castle (central-west Sardinia, Italy) es_ES
dc.type Capítulo de libro es_ES
dc.type Comunicación en congreso es_ES
dc.identifier.doi 10.4995/FORTMED2015.2015.1757
dc.rights.accessRights Abierto es_ES
dc.description.bibliographicCitation Columbu, S.; Meloni, P. (2015). Alteration processes of geomaterials used on the pentagonal tower of Serravalle Castle (central-west Sardinia, Italy). En Defensive architecture of the mediterranean: XV to XVIII centuries. Vol. II. Editorial Universitat Politècnica de València. 373-380. https://doi.org/10.4995/FORTMED2015.2015.1757 es_ES
dc.description.accrualMethod OCS es_ES
dc.relation.conferencename FORTMED2015 - International Conference on Modern Age Fortifications of the Western Mediterranean coast es_ES
dc.relation.conferencedate October 15-17,2015 es_ES
dc.relation.conferenceplace Valencia, Spain es_ES
dc.relation.publisherversion http://ocs.editorial.upv.es/index.php/FORTMED/FORTMED2015/paper/view/1757 es_ES
dc.description.upvformatpinicio 373 es_ES
dc.description.upvformatpfin 380 es_ES
dc.type.version info:eu-repo/semantics/publishedVersion es_ES
dc.relation.pasarela OCS\1757 es_ES


This item appears in the following Collection(s)

Show simple item record