Search results for "SUPERPAVE"

showing 8 items of 8 documents

Optimization of the Mix-Design System for the Sub-ballast Railroad

2017

Bituminous sub-ballast is an alternative solution to the unbound granular sub-ballast used in the railway track due to several benefits that it can provide. Indeed, it contributes to maintain the moisture content in the subgrade unchanged during all year. This decreases the subgrade deterioration process. Moreover, the presence of bituminous sub-ballast can also reduce vertical stiffness variations on the track; it can have a positive effect in the maintenance needs at transition sections (bridge-embankment) and in the attenuation of the vibrations induced by the rail traffic. Despite the importance of the presence of the bituminous sub-ballast to conceive the construction and/or rehabilita…

BallastEngineeringbusiness.industry040103 agronomy & agriculture0401 agriculture forestry and fisheriesSub-ballast superpave railway bituminous layer ESAL Ndesign.04 agricultural and veterinary sciencesbusinessCivil engineeringMix design
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Characterization of rubberized asphalt for railway sub-ballast. Improvements in the mix-design, performance features and rational methodology of HMA_…

2018

(STR) can be incorporated into asphalt mixtures in two different methods, which are referred to as the wet-dry process. The blending of recycled rubber (CRM) with asphalt has been used for years, and several manufacturing processes have been developed in Europe as well as in the USA. The use of a bituminous sub-ballast layer has been pointed out as an exciting alternative to the granular sub-ballast design traditionally applied in most railroad tracks. Frequently, unbound granular materials are replaced by bituminous sub-ballast that provide additional benefits to the subgrade protection. Much research has been conducted on finding other alternative material to be used as a modifier in asph…

MarshallPlusride-Generic mixtures.CompactionTraffic spectrumElasticityRailway Bituminous sub-ballast Granular sub-ballast Hot mix asphalt Superpave Crumb rubberESALRoadTemperature profileSettore ICAR/04 - Strade Ferrovie Ed AeroportiRUMACTensile strainFatigueSwelling and Rebounding effect
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CHARACTERIZATION OF RUBBERIZED ASPHALT FOR RAILWAYS

2018

Rubberized asphalt mixtures are regarded as a solution for improving the strength of the rail-track section. The recycled rubber has become an enhancer of the modified bituminous mixtures. In this work, it has been shown as a sustainable improvement option in HMA mixes due to the elastic behavior exposed by the rubber particles. The impact of thermal susceptibility on the mechanical properties of the railway bituminous sub-ballast layer has served to the advanced measurement of the thermal cycles inside the rail track. Different simulations following the Kentrack and Kenpave software were employed to be effective with the best mix-design for railways. According to weather situation, reviewe…

Thermal susceptibilityCrumb rubberSustainabilityRubberized asphaltSettore ICAR/04 - Strade Ferrovie Ed AeroportiSuperpaveRubberized asphalt; Sustainability; Thermal susceptibility; Crumb rubber; Superpave; Railways.Railways
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Effect of climate change on asphalt binder selection for road construction in Italy

2015

This work explores the influence of climate changes on the proper selection of asphalt binder for pavement construction purposes, according to the Performance Grade (PG) defined in the SUPERPAVE specifications. Based on temperature data at national level, it is possible to obtain thematic maps for the whole Italian territory, which is extremely useful for technicians and pavement engineers for selection of asphalt binder for road construction purposes. Furthermore, the statistical significant temperature trends’ knowledge enables deriving thematic maps which allows to include the effects of climate change in the asphalt binder design. It is argued that, due to climate change, the binders to…

EngineeringRoad constructionbusiness.industrySettore ICAR/02 - Costruzioni Idrauliche E Marittime E IdrologiaClimate changeTransportationCivil engineeringDurabilityTransport engineeringTemperature trend analysiThematic mapSUPERPAVEWork (electrical)Effects of global warmingAsphaltClimate changeSettore ICAR/04 - Strade Ferrovie Ed AeroportibusinessSelection (genetic algorithm)General Environmental ScienceCivil and Structural EngineeringTransportation Research Part D: Transport and Environment
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CHARACTERIZATION OF RUBBERIZED ASPHALT FOR RAILWAY SUB-BALLASTS

Tesi di dottorato sotto la supervisione del professore Gaetano di Mino del Dipartimento di Ingegneria Civile di Palermo), come borsista Marie-Curie all'interno del progetto SUPRITN 2013/2017. Il mio lavoro e la linea della ricerca riguarda i conglomerati bituminosi con granulato di gomma per lo strato di sub-ballast nelle linee ferroviarie. L’attività di ricerca comprende il mix-design dell’asfalto con aggiunta di gomma, la caratterizzazione e le prestazioni per la ferrovia in termini di comportamento meccanico e lo smorzamento delle vibrazioni. In particolare con l’avvento dell’alta velocità, diversi studi hanno evidenziato ottime caratteristiche fisico-meccaniche per ciò che riguarda il c…

MarshallPlusride-Generic mixtures.ElasticitàCompactionSuperpaveMiscele ttoballasto bituminoseRigonfiamentoSub-ballastFerrovia; Approccio sperimentali; Sub-ballast; Miscele ttoballasto bituminose; Fenomeni vibrazionali; Mix-design volumetrico; Traffico ferroviario; Temperatura; Bitume; Superpave; Gomma riclicata; Simulazione Traffico; Profilo di temperatura; ESAL; Spettro di traffico; RUMAC; Marshall; Strade; Miscellazione-Compattazione; Elasticità; Sforzo di trazione; Fatica; Rigonfiamento; Miscele HMA; Plusride_Generic dry.ESALGomma riclicataMiscele HMATemperature profileSimulazione TrafficoSettore ICAR/04 - Strade Ferrovie Ed AeroportiRailway Bituminous sub-ballast Granular sub-ballast Hot mix asphalt Superpave Crumb rubber; Temperature profile; ESAL; Traffic spectrum; RUMAC; Marshall; Roads; Compaction; Elasticity; Tensile strain; Fatigue; Swelling and Rebounding effect; Plusride-Generic mixtures.Traffico ferroviarioMiscellazione-CompattazioneTensile strainFatigueSwelling and Rebounding effectFenomeni vibrazionaliFaticaSforzo di trazionePlusride_Generic dry.Traffic spectrumTemperaturaStradeElasticitySpettro di trafficoRailway Bituminous sub-ballast Granular sub-ballast Hot mix asphalt Superpave Crumb rubberApproccio sperimentaliRoadProfilo di temperaturaMix-design volumetricoRUMACFerroviaBitume
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Analytical approach for the mix design optimisation of bituminous mixtures with crumb rubber

2018

The present paper provides a basis for defining a mix design method specifically tailored to rubberised asphalt that takes into account the behaviour of crumb rubber. An analytical approach to quantifying the recovered deformation of crumb rubber in the post-compaction phase has been developed in order to adjust the number of gyrations proposed by the Superpave method for compacting specimens of hot mix asphalt using a Superpave gyratory compactor. The maximum allowable amount of rubber has been calculated. Finally, a step-by-step protocol has been proposed in order to fabricate and compact crumb rubber modified mixtures with the gyratory compactor.

Crumb rubber; Mix design; Rubberised asphalt; Superpave gyratory compactor; Civil and Structural Engineering; Building and Construction; Materials Science (all); Mechanics of MaterialsMaterials science0211 other engineering and technologies020101 civil engineeringMix design02 engineering and technologyMix designRubberised asphalt0201 civil engineeringNatural rubberAsphalt pavement021105 building & constructionSettore ICAR/04 - Strade Ferrovie Ed AeroportiGeneral Materials ScienceCrumb rubberComposite materialCivil and Structural EngineeringCrumb rubberBuilding and ConstructionStrength of materialsSuperpave gyratory compactorCrumb rubber Superpave gyratory compactor Mix design Rubberised asphaltAsphaltMechanics of Materialsvisual_artSolid mechanicsvisual_art.visual_art_mediumMaterials Science (all)Deformation (engineering)
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Increased Stability of Rubber-Modified Asphalt Mixtures to Swelling, Expansion and Rebound Effect during Post-Compaction

2017

The application of bituminous mixtures modified with rubber from scrap-tires require attention and care during mixing and compaction. Rubber modifies the properties because it reacts in the internal structure of bitumen at high temperatures changing the performance of the mixture (interaction process of solvents with binder-rubber aggregate). The main change is the increasing of the viscosity and elasticity of the binder due to the larger sizes of the rubber particles by dry process but, this positive effect is counteracted by short mixing times, compared to wet technology, and due to the transport processes, curing time and post-compaction of the mixtures. Therefore, negative effects as sw…

Crumb-rubber Gyratory Compactor Rebounding Effect Superpave Mix-Design Swelling Sub-ballast Railway.Settore ICAR/04 - Strade Ferrovie Ed Aeroporti
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Procedure for a Temperature-Traffic Model on Rubberized Asphalt Layers for Roads and Railways

2017

The impact of temperature on the mechanical properties and thermal susceptibility of the railway bituminous sub-ballast layer, has served as motivation to develop the advanced measurement of thermal cycles in this layer and, an evaluation of the average seasonal temperatures interpolated by sinusoidal functions, of which characteristic parameters are determined. According to weather situation, Barber’s temperature model was used to prove the effectiveness for the railway superstructure. It is included the assessment of improved modified asphalt mixes performed with coarse rubber from scrap tires, having 1.5 to 3 percent of crumb rubber (particle size 0.2-4 mm) by weight of the total mix, as…

021105 building & construction0211 other engineering and technologiesTraffic modelForensic engineeringSettore ICAR/04 - Strade Ferrovie Ed AeroportiEnvironmental science02 engineering and technology021001 nanoscience & nanotechnology0210 nano-technologyRubberized asphaltSuperpave rubber-modified asphalt bituminous mixtures temperature compaction sub-ballast railway indirect tensile strength trackbed designJournal of Traffic and Transportation Engineering
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