Search results for "Strade"

La qualità ambientale. Ecosostenibilità e infrastrutture viarie

2009

Notiziario della SIIV su Le Strade. Il concetto e la definizione di qualità hanno subito grandi evoluzioni nel tempo, anche in relazione ai diversi ambiti di applicazione. La norma ISO 9000 del 2005, circoscrivendo la qualità al grado in cui un insieme di caratteristiche intrinseche soddisfano i requisiti, sottolinea la valenza generale del concetto di qualità, seppur applicabile a tutte le realtà umane, e le differenze connesse allo strumento di misurazione e alle modalità di organizzazione e gestione, dipendenti dal produttore del bene (o del servizio) e dal committente e/o utente e finalizzate alla riduzione degli sprechi in un'ottica di ottimizzazione degli sforzi. Ciò pone in essere l’…

Indagine sperimentale sui segnali sonori all’interno dei rotabili per la diagnosi dello stato dell’armamento ferroviario

2003

The maintenance of track provides an relatively frequent operations. A good maintenance-planning allows to reduce the interference between rail traffic and maintenance operations. It is necessary so to use a monitoring system of track conditions. In this paper is showed an indirect monitoring system that correlates track conditions and typical spectrum of in-cab noise. The first results of experimental survey are reported.

AN INTEGRATED MODEL TO EVALUATE TECHNICAL ENVIRONMENTAL AND ECONOMIC SUSTAINABILITY OF ROAD PAVEMENT

The unconditional exploitation of environmental resources, the emission of xenobiotic substances in nature and resulting pollution from the development of human activities have led, over time, to serious repercussions on the environment. Therefore these effects weigh on economic and social development. The need to deal with environmental issues and their relationship with economic development has led to the definition of sustainable development concept . The concept of sustainability combines three fundamental aspects which can not be separated, namely environmental, economic and social. The increasing sensitivity towards these socio-economic issues has driven research towards new fronts, u…

Road safety audit effectiveness at urban junctions

2002

In accordance with the Road Safety National Plan recently adopted in Italy and the initiatives subsequently undertaken by the National Infrastructure and Transport Department, this paper contains proposals for implementing an urban road safety audit in Italy, Our research will aim at evaluating the possible effects of such a practice. Our more specific aim is to determine the real or potential risk on roads by examining road infrastructure and observing road user behaviour in the absence of accident data. Four urban junctions, situated on one of the main thoroughfares of urban traffic in Palermo, were studied and a comparison was made between the data obtained by observing road user behavio…

Il contesto infrastrutturale siciliano e il quadro normativo di riferimento

2014

Il volume intende illustrare il tema della sicurezza stradale nelle sue molteplici dimensioni e in maniera trasversale, con uno specifico approfondimento per la Sicilia, mettendo a disposizione un'ampia selezione di informazioni qualitative e quantitative per specifiche analisi sulla sicurezza stradale, utili ai policy maker per intraprendere azioni di programmazione a livello locale. L'Italia registra un elevato tasso di mortalità rispetto alla media europea, una lenta riduzione del numero di vittime per incidente stradale e marcati divari territoriali. Nel contesto nazionale questo studio descrive poi l'evoluzione del fenomeno dell'incidentalità in Sicilia nell'ultimo decennio, individuan…

Criteria for Laboratory Studies on Fine Soils Treated with Lime

2011

When selecting the appropriate materials for constructing road infrastructures, an important way for minimizing both the economical and environmental impact is to make use of lime for treating those natural soils that, involved in the earthwork for opening road fences, are not suitable, as they are in nature, to fulfill the specific requirements for being used as part of road construction, such as road embankments (including the capping layer) or the improved subgrade or, again, the sub-formation. From this point of view, the treatment of fine soils with lime (if needed, with lime and cement) can be considered as one of the main measures for preserving the natural environment since it fulfi…

Estimation of Air Pollutant Emissions in “Turbo” and in Conventional Roundabouts

2013

The road pollutant emissions, above all in urban context, are correlated to many infrastructural parameters and to traffic intensity and typology. The research work on road junction geometry, carried out in European research centres, has recently allowed to design new road intersection types which are of undoubted interest, especially in terms of traffic functionality and safety, like the turbo roundabouts (in which right-turn manoeuvres do not conflict with the circulating flow). The main objective of this paper is to propose a model for the estimation the performances and the pollutant emissions into turbo roundabouts. A comparative analysis between conventional roundabout and turbo round…

Rheological investigation on the ageing performance of bio-recycled asphalt binders and mixtures

2023

The current need to move towards more sustainable technologies in the construction sector has promoted the investigation of using alternative materials in asphalt mixtures for pavements. Biomaterials, used as biobinders, have shown their potential as partial replacement of bitumen in asphalt mixtures as solution to decreasing the demand for fossil-fuel-based binders as well as CO2 emissions. However, more research is needed to increase the replacement of bitumen in asphalt mixtures. In this investigation,biobinders are used as full replacement of virgin bitumen and as recycling agent within asphalt mixtures with high Reclaimed Asphalt (RA) content. Blends of biobinders and RA binders, and b…

An italian research on mechanical properties on asphalt with tire-rubber

2003

In Palermo a research study was initiated with following objectives: characterisation of the asphalt with tire rubber; study of pavements overlaid with this type of asphalt; cost estimation of asphalt rubber production process. This paper describes the first results achieved in the study concerning the mechanical properties of asphalt with tire rubber for road base and base course. In this research on dry process, more than 400 specimens have been tested at the DIIV laboratory for analysing the influences of crumb rubber modifier and powdered rubber modifier on the Marshall and indirect tensile test.

EXPERIMENTAL INVESTIGATION ON DRY ASPHALT RUBBER FOR SUBBALLAST

2011

The asphalt rubber mixes have a wide application field in the railroad and road superstructures because of their technical and environmental properties. While in many countries the wet process is often used to make bituminous mixtures, the dry process doesn’t have the same degree of application even though a larger recycling of waste tires rubber is allowed than the dry process. This paper focuses on the mix-design of the Dry Asphalt Rubber (DAR) for subballast of the railroad superstructure in order to define a sound laboratory procedure of mix-design with reference to Marshall test and Superpave Gyratory Compactor (SGC) test. The comparison between Marshall test and SGC test highlights th…