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Granites by-products in comparison with the dolerite for the construction of pavement structures with the method of inverted pavement
No full textSardinia is characterized by high amounts of granite, with mining rocks for ornamental use ranked 2nd in the world after China. Direct result of mining is the production of scraps and blocks of poor ornamental quality being landfilled. The study reported on this paper is a part of an ongoing researched aimed to optimize the use of extracted rockdebris, with scope of reducing the amount of dumped material and support the sustainability of natural resources. In particular, the study focused on the use of this resource for the realization of road pavement layers according to the South-African technique of the so called “Inverted Pavement”. This technique provides high mechanical strength for an unbound base layer super compacted. The material commonly used in South Africa is the crushed stone derived from dolerite, which is present in high quantities.The possibility of using granite has being investigated according to the South Africa Technical Specifications. Granites deriving from quarries were analyzed and compared with Dolorite from the physico-chemical and mechanical point of view. According to the preliminary results obtained granites by products are a valuable resource to be used to constructed super compacted layers of Inverted Pavement
Analisys of deflectometer campaign on high seasonality airport
No full textThe load-carrying capacity, is one of the indicators used to assess airfield pavement conditions. It could be estimated by evaluating the response of stationary dynamic loads, using a deflectometric device that simulates the stress inducted by an aircraft moving at moderate speed. This device is widely used because tests are non-destructive and rapid to execute and can be conducted for cyclic investigations, providing valuable support to maintenance and rehabilitation (M&R) decision makers through pavement management system (PMS). Pavement response is evaluated as a function of the deflection basin induced by the deflectometric device. It is well known that deflectometric measurements are influenced by external parameters such as weather conditions, especially temperature of upper layers or the percentage of water contained on unbounded layers. In this study the deflections basin response obtained for different load and weather conditions has been analyzed through the application of benchmarking values for immediately structural assessments. Tests were performed using the Heavy Weight Deflectometer (HWD) on 9 points along five longitudinal alignments from the centerline, 0.00 m, ± 3.00 m, and ± 5.20 m. . The benchmarking methodology was used to evaluate and compare runway pavement performance under different weather conditions and testing loads. The applied benchmarking methodology resulted an easy and rapid assessment tool of pavement conditions at network-level
Use Of Virgin Rocks Debris To Construct Road Pavement Super Compacted Layers
No full textSardinia has a major mining history that holds considerable importance in Italian mining economy. Sardinian mining companies that up to 2005 resulted active and registered in the trade register of the Chamber of Commerce are 241, of which 95.9% are in the branch of the extraction of non-metallic minerals, including construction material sand stones for ornamental use. Industrial minerals extracted in Sardinia represent 50% of the Italian production.
In this context the use of natural aggregates such as basalt, trachyte and andesite has been investigated in order to sustain and make the most of local natural available resources in the field of road construction.
This research has focused the attention on the evaluation of using these available granular materials for the construction of super compacted base layers according to the South-African technique of the Inverted Pavement. Inverted Pavement is a widely used method of road construction that allows a considerable saving in terms of thickness of Hot Mix Asphalt layers, as well as overall cost of the infrastructure. In this paper chemical and physical-mechanical properties of the materials in question were analyzed and the results were compared with those of the South African rocks. The results of the study made it possible to identify the design criteria to enhance the commitment of these natural resources through the maximization of their mechanical performanc
Reliability of using air void content for assessing the performance of a hand laid recipe mixed bituminous material in utility reinstatement
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Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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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