1,721,011 research outputs found
Proceedings of the 5th International Symposium on Asphalt Pavements & Environment (APE)
No full textThis volume highlights the latest advances, innovations, and applications in the field of asphalt pavement technology, as presented by leading international researchers and engineers at the 5th International Symposium on Asphalt Pavements & Environment (ISAP 2019 APE Symposium), held in Padua, Italy on September 11-13, 2019. It covers a diverse range of topics concerning materials and technologies for asphalt pavements, designed for sustainability and environmental compatibility: sustainable pavement materials, marginal materials for asphalt pavements, pavement structures, testing methods and performance, maintenance and management methods, urban heat island mitigation, energy harvesting, and Life Cycle Assessment. The contributions, which were selected by means of a rigorous international peer-review process, present a wealth of exciting ideas that will open novel research directions and foster multidisciplinary collaboration among different specialists
Environmental sustainability and energy assessment of bituminous pavements made with unconventional materials
No full textThe increasing sensibility towards the questions related to climate change has made the scientists and technicians aware of the need to incorporate the principles of sustainable development into the road construction sector. In this view, recycled materials in road pavements and technologies to decrease the overall carbon footprint have become more and more important. Based on the ISO14040 series, the overall purpose of this study is calculating, by means of a systemic approach, the life-cycle energy and the carbon footprint of road pavement solutions. To this aim, several alternatives in terms of bituminous mixtures (warm mix asphalt, reclaimed asphalt pavements, waste plastics) were considered. All the phases of pavement life from material production to end-of-life stages were taken into account. Results demonstrate that even if there is not a best alternative from all the angles of the analysis, however, the WMA technology, combined with the use of RAP, improves the pavement energy and environmental performance, involving a reduction in primary energy consumption and raw materials, and avoiding impacts for disposal
The BIM (building information modeling)-based approach for road pavement maintenance
No full textThe recent developments of road pavement survey technologies guarantee acquisition of detailed data regarding the main functional and structural indicators, at a very high frequency and levels of accuracy and precision unconceivable few years ago. The relevant information, regarding surface distresses too, is thus available in economical, high-speed and high-resolution forms, with limited disturbance on traffic and road agencies issues. However, the availability of such a mass of data poses interesting questions concerning the most efficient processing and analysis methods, for optimizing maintenance operation planning. Unfortunately, the PMS adoption is not very common and widespread, as they are significantly complicated and sophisticated, with critical consequences in their actual and intense practical use. Then, there is a need of simplifying the pavement maintenance process, by defining smart tools actually supporting the operators in the analysis and decisional phases. BIM (Building Information Modeling) procedures can absolutely represent a strategical solution. Indeed, BIM models, already widely adopted in the structural fields, have been recently introduced in the infrastructural design phases, simplifying the entire life-cycle of the construction, with representation clarity, mistake reduction, and money savings. However, although the BIM advantages have been significantly exploited in the design phases, pavement maintenance has not been directly involved in the BIM processes. Then, this paper focuses on a methodological analysis of the problem, aiming to propose a novel BIM-based approach for managing pavement maintenance. The goal is to define proper “smart objects”, based on specific relational databases, that may represent a more suitable instrument for handling pavement condition and quality information, in a user-friendly software environment. The potentialities of the modern survey technologies may be integrated and optimized in a BIM process, involving in parallel both design and maintenance
Airport Pavement Management Systems: An Open BIM Approach
No full textBuilding Information Modelling (BIM) offers the possibility to access and oversee information about the asset, throughout its lifecycle. One of the phases where BIM can provide key benefits is the Operation phase, e.g. facility management/maintenance, decommissioning and major re-programming, supported by the Information Management Process (IMP), which may include a Computer-Managed Maintenance System (CMMS). When discussing roads, highways or runways the maintenance phase is largely concentrated on the pavement, and a robust Pavement Management System (PMS) should be integral part of the IMP, focusing mainly on the evaluation of the pavement’s present condition and prediction of its future condition. In the airport domain, the importance of an Airport Pavement Management System (APMS), falls both in a cost effectiveness and aviation safety viewpoint, providing consistent, objective and systematic procedures for determining priorities, schedules and resources’ assignment. Introducing the case study of the Lamezia Terme International Airport, this paper presents possible improvements in the interoperability of maintenance data of the airport’s runway with reference to the IFC Reference Processes, being that Maintenance Management is one of the defined projects within the Facilities Management (FM) domain inside BuildingSMART International
Fast falling weight accelerated pavement testing and laboratory analysis of asphalt pavements reinforced with geocomposites
No full textMany reinforcement systems have been designed to improve fatigue life and to prevent or mitigate reflective cracking and rutting in asphalt pavements. The goal of this research was to assess the effectiveness of asphalt pavement rehabilitation with geocomposites to limit fatigue cracking, reflective cracking and rutting by using Accelerated Pavement Testing (APT) and laboratory testing. APT was used to evaluate the pavement performance, simulating the effects of long-term vehicular traffic on the pavement structure in a relatively short period of time. Accelerated pavement tests were performed using the Fast Falling Weight Deflectometer (FastFWD) equipment in a trial section characterized by different types of interfaces (reinforced with geocomposites and unreinforced). In addition, two types of specimen were taken from the trial section to carry out laboratory testing: cores for Ancona Shear Test Research and Analysis (ASTRA) tests and beams for three point bending (3PB) tests. The APT and 3PB tests results demonstrated that the geocomposites investigated are an effective method to enhance asphalt pavement performance. Moreover, ASTRA tests showed that the application of geocomposite at the interface causes a de-bonding effect between asphalt layers that could be beneficial to promote stress-relieving in case of reflective cracking and thermal cracking
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
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