Search results for "ARCHITETTURA TECNICA"
showing 10 items of 478 documents
Mix design and mechanical performance of geopolymer binder for sustainable construction and building materials
2017
Sustainability in construction is a major concern worldwide, due to the huge volume of materials and energy consumed by this sector. Associated supplementing industries (e.g. Portland cement production) constitute a significant source of CO2 emissions and global warming. Valorisation and reuse of industrial wastes and by-products make geopolymers a solid and sustainable via to be followed as a valid alternative to Portland cement. In this work the mix design of a green fly ash-based geopolymer is evaluated as an environmentally friendly construction material. In the pursuit of sustainability, wastes from a regional kraft pulp industry are exploited for the material processing. Furthermore, …
Mix design and mechanical performance of geopolymeric binders and mortars using biomass fly ash and alkaline effluent from paper-pulp industry
2019
Abstract This work investigates the use of biomass fly ash (BFA) and an alkaline effluent (AEF), both generated from the Kraft pulp industry, in the preparation of geopolymeric binders and mortars for construction applications. BFA replaced the metakaolin (MK) while the AEF substituted the distilled water used to dissolve NaOH pellets. The mix design aims to maximize the amount of both the wastes and to optimize the materials properties, such as workability and mechanical performance. At the same time, also the environmental impact decreases enhancing the materials' sustainability and facilitating the circular economy. For the previously optimized BFA/MK ratio (70/30 wt.%) several NaOH/Na2S…
Nano-composite thermochromic thin films and their application in Energy-efficient glazing
2010
A hybrid atmospheric pressure and aerosol-assisted chemical vapour deposition strategy is presented as a facile route for the production of vanadium dioxide nano-composite thin films. The effect of the inclusion of gold nanoparticles and the use of a surfactant molecule, tetraoctylammonium bromide, is discussed. The films were fully characterised using a wide variety of techniques, including scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy and UV/vis/NIR spectroscopy. It is shown that micro-structural changes brought about by careful control of film growth conditions, and/or the use of surfactant, lead to an enhancement of thermochromic properties. Gold nano…
Active Translucent Envelopes in Warm and Hot Areas – An innovative multifunctional, dry-assembled components for BIPV
2014
International directives that regulates buildings energy efficiency and environmental sustainability establish strict parameters for the construction of a new generation of “Zero Energy Buildings” indicating transmittance limits for building envelope components and encouraging the use of renewable sources. In this sense, the PV sector aims at the definition of novel efficient solutions for the integration in the building envelope, standing out for their multifunctional features. After an overview on the main PV technologies and building integrated applications, focusing on semi-transparent envelope solutions, the paper shows the results of a research carried out at the Department of Archite…
Influence of sol counter-ions on the visible light induced photocatalytic behaviour of TiO2 nanoparticles
2014
Titanium dioxide (TiO2) nanoparticles are attracting increasing interest because of their superior photocatalytic and antibacterial properties. Here, aqueous titanium oxy-hydroxide sols were made, using a green synthesis method, from the controlled hydrolysis/peptisation of titanium isopropoxide. Three different mineral acids were used to peptise the sol (HNO3, HBr and HCl), and provide counter-ions. The influence of nitrate or halide sol counter-ions on size distributions of the starting sols were measured via photon correlation spectroscopy (PCS). Semi-quantitative phase composition analysis (QPA), on the gels thermally treated at 450 and 600 degrees C, was carried out via Rietveld refine…
Laboratory Tests for Assessing the Reliability and Durability of Innovative Cold-Glued 3D Glass Building Subcomponents
2020
The paper shows the results of analyses of the behavior of an innovative subcomponent made of two glass shells and a plastic thermal belt interfaced with a resin-based adhesive, in order to define the plastic material–adhesive combination able to guarantee compliance with the requirements related to mechanical strength, thermoacoustic insulation, dimensional stability, material compatibility, and durability. Two different types of ultraviolet (UV)-curing adhesive were used to establish the best plastic–adhesive combination. A study of the mechanical behavior and the reliability over time of the bonded assembly was conducted by performing accelerated weathering tests and tensile tests on 30 …
L'Italia sul mare
2019
Il decimo numero monografico della rivista internazionale Proyecto + Ciudad, della Universiade Politécnica de Cartagena, dedicato a "L'Italia sul mare", pone a confronto gli articoli di docenti universitari italiani, provenienti dalle Scuole di architettura di Palermo, Cagliari, Napoli, Reggio Calabria, Roma, Siracusa e Venezia. Tra i temi affrontati si segnalano: Mediterraneo: mito, paesaggi e architetture silenti; Il canto del mare, il canto dell’architettura; Il mare e la città. Cefalù e Il Parco delle mura megalitiche di Pasquale Culotta, Giuseppe Leone e Tania Culotta; La “terra di mezzo” tra Siracusa e Augusta. Dalle poleis greche alla città lineare; Le “nostre” distanze. Il difficile…
Alla scoperta di una città sconosciuta: i mercati coperti nella Palermo dell'Ottocento
2015
Dalla fine del Settecento, per oltre un secolo si assiste a Palermo a tentativi di razionalizzare il tradizionale mercato di strada in strutture commerciali stabili: da portici e loggiati ad organismi funzionali ed aggiornati. Insieme a teatri ed altre infrastrutture urbane vennero realizzate due spettacolari architetture di mercato, simili a quelle che andavano sorgendo nelle maggiori città europee, ed in seguito anche strutture di minore impatto, quali tettoie e gallerie urbane. L'utilizzo del nuovo linguaggio in ferro favorì l'aggiornamento di un apparato produttivo ed imprenditoriale fragile, ma in rapida crescita. L’indagine presso biblioteche, archivi e giornali dell’epoca contribuisc…
Modica: la fabbrica della città
2016
PREMESSA. Non crediamo sia necessario soffermarsi sul fondamentale ruolo della manualistica come base conoscitiva e tecnica nel progetto di recupero. Ma chi analizza l’architettura storica di aree ristrette, connotate il più delle volte da specificità e tipicità, sa bene che la “regola dell’arte universale” è una contraddizione in termini, e che nell’architettura dei nostri centri urbani pluristratificati necessitano la valorizzazione e la tutela della varietà e della differenza, della dimensione locale come alternativa ad una condizione periferica. Ciò comporta la necessità di acquisire, attraverso l’approfondimento delle tipologie di base e delle caratteristiche dei materiali, sia morfolo…
Bivalve mollusks shells valorisation and recycling: market potentiality and novel building products
2023
Construction is a fundamental driver of the world economy, recognized as a sector that generates a great contribution to the social and economic development. At the same time, it shows an enormous environmental impact through an unstoppable consumption of non-renewable resources, a high energy consumption, and an associated atmospheric emission of pollutant. Consequently, the research and development of novel and green production processes and sustainable building materials is of paramount importance. The sustainability of materials and production processes could be improved by enhancing and reusing wastes from various industrial sectors. In this paper, the fishery sector will be analysed, …