Search results for "construction materials"
showing 10 items of 21 documents
Compatible rehabilitation of the Sicilian rural architecture: the case study of "Calcibaida" in Caltavuturo
2020
The Sicilian common typological form of rural estate is the masseria, typical of the latifundium. More particularly, it is a large fortified farm built to control and manage a vast land-property, the old fiefdoms. This paper will analyse the masseria Calcibaida as an eminent example of the mentioned Sicilian rural world. Calcibaida is located in the territory of Caltavuturo, in the centre of Sicily, within the mountain landscape of the Madonie mountains. The complex consists of a compact aggregate of buildings with an internal courtyard and a close large warehouse, further embellished by a fine drinking trough. The typological characteristics, materials and construction technologies of the …
COSTRUIRE L’AZZARDO. IL CORNICIONE NELL’ARCHITETTURA STORICA, FRA REGOLA E SPERIMENTAZIONE
2018
The book explores the historical and constructive aspects of the cornices that, from elements of protection, they can also become elements of degradation and instability due to their form. The structure of the text of this volume consists of three main parts, presenting some technical aspects and issues of uncommon attention. The first part analyzes a discussion about the formal and material values of the cornice; in fact, it presents complex characters and summarizes the problems deriving from formal and constructive requirements of the building envelope, due to the double value of ornamentation (crowning of the building) and functional component (removal system of meteoric water from the …
Nuclear Magnetic Resonance for Cultural Heritage
2007
Abstract Nuclear magnetic resonance (NMR) portable devices are now being used for nondestructive in situ analysis of water content, pore space structure and protective treatment performance in porous media in the field of cultural heritage. It is a standard procedure to invert T 1 and T 2 relaxation data of fully water-saturated samples to get “pore size” distributions, but the use of T 2 requires great caution. It is well known that dephasing effects due to water molecule diffusion in a magnetic field gradient can affect transverse relaxation data, even if the smallest experimentally available half echo time τ is used in Carr–Purcell–Meiboom–Gill experiments. When a portable single-sided N…
Extremophilic taxa predominate in a microbial community of photovoltaic panels in a tropical region
2021
ABSTRACT Photovoltaic panels can be colonized by a highly diverse microbial diversity, despite life-threatening conditions. Although they are distributed worldwide, the microorganisms living on their surfaces have never been profiled in tropical regions using 16S rRNA high-throughput sequencing and PICRUst metagenome prediction of functional content. In this work, we investigated photovoltaic panels from two cities in southeast Brazil, Sorocaba and Itatiba, using these bioinformatics approach. Results showed that, despite significant differences in microbial diversity (p < 0.001), the taxonomic profile was very similar for both photovoltaic panels, dominated mainly by Proteobacteria,…
Numerical vibroacoustic analysis of plates with constrained-layer damping patches
2011
International audience; A numerical vibroacoustic model that can manage multilayered plates locally covered with damping patches is presented. All the layers can have an on-axis orthotropic viscoelastic behavior. Continuity of displacements and transverse shear stresses at each interface is enforced, which permits to write the entire displacement field in function of the displacements of the-common-first layer, leading to a two-dimensional plate model. The problem is then discretized by Rayleigh-Ritz's method using a trigonometric basis that includes both sine and cosine functions in order to treat various boundary conditions. The excitation can be of mechanical kind (concentrated or distri…
En contexte ou hors contexte : lecture des matériaux et lecture du bâti
2020
Le choix des matériaux occupe une place importante dans l’élaboration du projet architectural, et détermine des orientations essentielles pour le chantier, dans la réalisation de celui-ci, son organisation, voire sa progression. Loin de se résumer à un simple descripteur ou accessoire de la stratigraphie du bâtiment, les matériaux de construction sont avant tout le reflet d’une réalité complexe du chantier à la fois matérielle et immatérielle : projet, exigences et capacité financière du commanditaire, réseaux d’échange, environnement sollicité. Leur prise en compte dans l’analyse du bâti transcende la logique stratigraphique, en épaulant celle-ci là où elle fait défaut et en replaçant la r…
La distribución de cerámica y materiales de construcción en España
2007
La caracterización de las empresas de un sector es esencial para com- prender la situación de la distribución comercial y analizar su evolución. En el presente trabajo abordamos el estudio de los distribuidores de material cerámico y de construcción en España a partir de fuentes de información primaria y secundaria. La lectura conjunta de los resultados obtenidos a par- tir de ambas fuentes de datos permite realizar una primera aproximación a la situación de un sector que ha experimentado un extraordinario crecimiento en los últimos años. Characterization of firms in a sector is essential to understand the situation of commercial distribution and monitor developments. In this paper we study…
Sapropeļa kūdras, sapropeļa kokskaidu siltumizolācijas plāksnes un to īpašības
2014
Siltumizolācijas materiāli, kuros par pildvielu tiktu izmantoti vietējie biomasas produkti, bet par saistvielu kalpotu dabiskas izcelsmes saistvielas, piemēram, sapropelis, uzskatāmi par inovatīviem un to pielietošana sekmētu ekoloģiskās būvniecības nozares attīstību. Šādu risinājumu izstrāde ir aktuāla, jo Latvijā ir ievērojami sapropeļa resursi, kuru izmantošanu kavē to nepietiekama izpēte un ekoloģiskās būvniecības nozares intensīva attīstība. Pētījuma mērķis ir iegūt sapropeļa-koksnes, kūdras-koksnes siltumizolācijas plāksnes, noteikt optimālās plātnes sastāva attiecības un raksturot iegūto plātņu īpašības. Veikto pētījumu rezultātā tika noteiktas siltumizolācijas materiālu paraugu mehā…
Amorphous Polyphosphate and Ca‐Carbonate Nanoparticles Improve the Self‐Healing Properties of both Technical and Medical Cements
2020
Cement is used both as a construction material and for medical applications. Previously, it has been shown that the physiological polymer inorganic polyphosphate (polyP) is morphogenetically active in regeneration of skin, bone, and cartilage. The present study investigates the question if this polymer is also a suitable additive to improve the self-healing capacity not only of construction cement but also of inorganic bone void fillers. For the application in the cement, two different polyP-based amorphous nanoparticles (NP) are prepared, amorphous Ca-polyP NP and amorphous Ca-carbonate (ACC) NP. The particles are integrated into poly(methyl methacrylate) in a concentration ratio of 1:10. …
Aristocratic power exaltation between XVI and XVIII centuries in Palermo Area: psychological and symbolic aspects behind suburban villas' constructio…
2014
From ancient times, due to a very favourable climate, and the presence of many pure water sources, the “Golden Valley” surrounding the city of Palermo saw the settlement of an elaborate system of rural farms, “industrial” buildings. During the XVI century, and especially towards the XVIII century, spending some time in the countryside became a real trend for the urbanized Sicilian aristocracy. Thus, such buildings were slowly renewed into sumptuous suburban palaces to exhibit feudal family richness and power as well as to make living in the countryside more pleasant. In western Sicilian area, the architectural typology of the suburban villa is locally characterized by a mixture of the luxur…