Search results for "PAV"
showing 10 items of 368 documents
Hybrid Procedure for Automated Detection of Cracking with 3D Pavement Data
2016
Pavement cracks are considered a major indicator of pavement performance. Because traditional manual crack surveys are dangerous, time consuming, and expensive, technologies have been developed to collect high-speed pavement images, and numerous algorithms have been proposed to detect cracks on pavement surface. The latest PaveVision3D Ultra system (3D Ultra) has been implemented to achieve 30-kHz three-dimensional (3D) scanning rate for 1-mm resolution pavement surface data at highway speed up to 100 km/h (60 mi/h). This paper presents the application of a hybrid procedure for automated crack detection on 3D pavement data collected using 3D Ultra. The procedure combines three different me…
Evaluation of the Safety Performance of Turbo Roundabouts by Means of a Potential Accident Rate Mode
2015
Turbo roundabouts are a particular road intersection layout, designed to increase the safety of double-lane roundabouts, while maintaining their excellent capacity. The main feature of this new concept of roundabout is the impossibility to move from one lane to another, provided by physical barriers marking the lanes. The paper shows an application to turbo roundabouts of a potential accident rate model, aiming to evaluate their safety improvement. Themodel is based on the concept of potential conflict: each vehicle involved in a general intersection performs a series of maneuvers which potentially imply a crash, according to the actual traffic. The number of accidents related to each criti…
Environmentally appraising different pavement and construction scenarios: A comparative analysis for a typical local road
2015
Abstract The aim of this work is to carry out a comparative analysis of environmental impacts for different scenarios of a typical local road. Life Cycle Assessment (LCA) is the modeling tool used to quantify and characterize comparative environmental impacts. In carrying out this specific application of the LCA, different road construction techniques were considered with regards to the whole structure and compared in order to identify the best alternative in terms of environmental sustainability. So far, in fact, typical LCA frameworks of roads have focused on recycled materials for pavement layers only, thus neglecting study of the materials used in the embankment or in the subgrade. In t…
An extension of the fractional model for construction of asphalt binder master curve
2015
Knowledge and prediction of viscoelastic behaviour of asphalt binder is of great interest in order to design asphalt mixtures for civil construction of road and airports with good performances. The capability of a fractional model – requiring a very limited number of parameters – to describe and predict the linear viscoelastic behaviour of asphalt binder subjected to sinusoidal oscillations is investigated. Experimental data of complex modulus, |G*|, and phase angle, δ, are used to validate the proposed constitutive model. Based on the proposed extension of a fractional model, complex modulus isotherms for a range of frequencies can be created simply starting from isochronals at frequency v…
Backcalculation of airport pavement moduli and thickness using the Lévy Ant Colony Optimization Algorithm
2016
Interpretation of NDTdata is crucial in any Airport Pavement Management System (APMS), in order to implement strategies to maintain airport pavementssince they allow to estimate their remaining life and related maintenance needs and activities. In this paper, the AntColony Optimization algorithmwasused for backcalculation of pavement moduli from surface deflection data. The algorithm’s performances are illustrated and improvement in prediction quality is demonstrated both in terms of goodness of fitness and computational effort. Moreover, it is proved that the proposed algorithm is also able to predict layer thicknesses, taking into account their variation too.
Recommendation of RILEM TC237-SIB: protocol for characterization of recycled asphalt (RA) materials for pavement applications
2018
This recommendation proposes an experimental protocol to characterize Recycled Asphalt (RA) materials. The guidelines presented in this document are based on the results of a Round Robin Test (RRT) organized by the RILEM Technical Committee 237-SIB “Testing and characterization of sustainable innovative bituminous materials and systems” and provide information on the testing procedure, data analysis and indications for the preparation of a test report.
Tra Eco e Narciso. Modelli e strategie della scrittura epistolare del Novecento
2010
Il saggio indaga i modi e i temi dell'epistolografia del Novecento nel suo rapporto con le forme dell'invenzione letteraria.
Ergonomiski darba apavi un to ietekme uz nodarbināto labklājību
2015
“Ergonomiski darba apavi un to ietekme uz nodarbināto labklājību”. Darba autors: Uldis Stepens. Darba vadītājs: Dr.sc.admin., Eur.Erg., Henrijs Kaļķis. Maģistra darbs uz 72 lpp. ietver 26 attēlus, 16 tabulas, 5 pielikumus un 27 informatīvos avotus. Darbs sastāv no 4 daļām. Pirmajā daļā ir apskatīta un analizēta pieejamā literatūra un semināru materiāli par darba apavu ergonomiku, kritēriji par apavu izvēli un ieguvumi no ergonomiskiem apaviem. Otrajā daļā ir aprakstītas izmantotās metodes: Somijas 5 baļļu, Austrijas ķīmisko risku, ergonomisko risku novērtēšana, psiholoģisko risku anketas un objektīvā slodzes novērtēšanas metode. Trešajā daļā ir rezultātu apkopošana un datu analīze, bet cetu…
Oriente en la Exposición Universal de Osaka 1970
2016
La Exposicion Universal de Osaka en 1970 se propone como posible modelo de una nueva ciudad, en la cual los elementos efimeros tienden a estarmucho más presentes que la arquitectura misma, la cual se limita a definir el esqueleto del sistema constrùctivo. El tema propuesto pretende evidenciar un nuevo acercamiento a las consecuencias de la ideologia del progreso de la civilisación y la tecnologia con referencia a la Segunda Guerra Mundial como ejemplo destructivo del knowhow cientifico.
Il potere dell’architettura. L’ideologia di regime all’Esposizione Internazionale di Parigi 1937
2014
The political crackdown during the 20th Century finds in the International Events a special place for the hosting Countries to spread their ideologies to the visitors and to all the other Countries attending the event. National Pavilions become the subject of propaganda, and their architectural language became an important part of the collective identity’s reclaimed logic, even if it wasn’t always real. Paris International Exposition of 1937 is a paradigmatic case: it’s a mirror of that time and of the prewar period’s international tensions. Born under the auspices of peace, it finally results the most relevant expression of the relation between Power and Architecture.