Search results for "Strade"

Prediction of hydraulic and acoustic properties of open-graded mixes

2014

The use of open-graded mixes increases significantly the hydraulic permeability of pavement and contributes to reduce the noise impact in comparison to traditional pavement. Such characteristics are very appealing and would greatly increase driver's safety. However, during service life, the pores tend to be clogged by many factors among them secondary traffic compaction and filling of voids by fine materials are relevant, especially on heavy routes. In this case the noise reduction and drainage capabilities will gradually disappear, causing serious problems for road safety and maintenance. In this paper we propose a simulation approach in order to predict the drainage and acoustic behavior …

Estimation of pollutant emissions from road traffic by image processing techniques. A case study in a suburban area

2013

This paper suggests a methodology based on the image processing technique able to automatically calculate the vehicle traffic and its components (light vehicles, heavy vehicles and motorcycles). The method also allows to evaluate instant vehicle speeds and, where necessary, to rebuild vehicle trajectories. Traffic data obtained through the procedure described below (capacities and speeds) can be also usefully applied to estimate pollutant emissions from vehicle traffic per year; therefore, the suggested method employs the algorithms defined with CORINAIR procedures, implemented in Copert 4 software. In order to evaluate how effective is the methodology, an experiment has been carried out in…

Super-Resolution Images Methodology Applied to UAV Datasets to Road Pavement Monitoring

2022

The increasingly widespread use of smartphones as real cameras on drones has allowed an ever-greater development of several algorithms to improve the image’s refinement. Although the latest generations of drone cameras let the user achieve high resolution images, the large number of pixels to be processed and the acquisitions from multiple lengths for stereo-view often fail to guarantee satisfactory results. In particular, high flight altitudes strongly impact the accuracy, and result in images which are undefined or blurry. This is not acceptable in the field of road pavement monitoring. In that case, the conventional algorithms used for the image resolution conversion, such as the bilinea…

ANALISI BEFORE-AFTER CON MODELLAZIONE MULTIVARIATA

2009

CARATTERIZZAZIONE GEOTECNICA DI UN’ARGILLA DI ALTA PLASTICITAꞌ TRATTATA CON CALCE

2013

Nel corso dei lavori di ammodernamento di una strada di grande comunicazione in Sicilia, si è valutata la possibilità di utilizzare come materiale di costruzione un’argilla di alta plasticità trattata con calce, proveniente dagli scavi eseguiti in una parte del tracciato. A questo scopo è stata avviata un’estesa ricerca sperimentale in laboratorio e sono state verificate le condizioni di posa in opera del materiale con la realizzazione di un rilevato sperimentale. Nella nota si illustrano i primi risultati della ricerca riguardanti: prove di taglio diretto, prove di compressione ad espansione laterale libera e misure di suzione.

Gli Stati Uniti: l’attenzione per la rilevanza strategica delle reti federali

2017

Nel capitolo si descrivono le modalità di partenariato pubblico-privato impiegate negli Stati Uniti per la realizzazione e la gestione della rete autostradale.

Modeling of the viscoelastic behavior of paving bitumen using fractional derivatives

2009

The paving grade bitumen used in the production of asphalt mixtures for road construction is significantly able to affect the in-service performances of flexible road pavements. It has been proved that, when subjected to loading conditions comparable with most pavement operating conditions, bituminous binders behave as linear visco-elastic materials. The aim of this paper is to propose a model based on fractional differential equations which is able to describe the behavior of bituminous binders in the linear viscoelastic range. Shear creep testing and creep recovery testing were carried out over a range of temperatures and by applying a stress level which makes it possible to maintain the …

UNA PROCEDURA AUTOMATIZZATA PER LA DETERMINAZIONE DELLE CURVE MAESTRE DI BITUMI PER USO STRADALE

2014

Evaluation of Load transfer in rigid pavements by Rolling wheel deflectometer and Falling weight deflectometer

2020

Abstract Rigid pavements have widespread use, e.g, in motorways and airports, due to their excellent properties such as high bearing capacity and long lifetime. However, when rigid pavements fail it is often due to bad load transfer efficiency (LTE) at its joints. Traditional methods of measuring LTE can be time consuming. Here, we study the possibility of measuring LTE using a moving load with the aim of achieving higher productivity. An experiment simulating Rolling Weight Deflectometer (RWD) measurements on a joint was carried out to gain understanding and confidence that can guide the analysis of real RWD data. Continuous data from measurements across a joint allows for determination of…

Exploiting 3D Modelling and Life Cycle Assessment to Improve the Sustainability of Pavement Management

2020

Today road agencies worldwide face difficult decisions for construction, maintenance and rehabilitation of their road infrastructure as they try to balance limited budgets. This is further complicated rising environmental concerns over equipment and techniques used for these practices. This has led agencies to consider alternative approaches for smarter and sustainable pavement asset management systems. This paper considers the use of a low-cost 3D image modelling distress identification and classification proposal for data acquisition and analysis. To establish its environmental friendliness, a case study in Palermo, Italy, is considered wherein a Life Cycle Assessment (LCA) exercise is do…