Search results for " Gyratory Compactor"

showing 3 items of 3 documents

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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Fundamental characterisation of reclaimed asphalts: The importance of testing homogeneous specimens

2013

This study highlights the importance of defining appropriate specimen manufacturing procedures when assessing the fundamental properties of reclaimed asphalt (RA) mixes for further modelling purposes. Two gyratory compactor procedures were used: the first leading to specimens with a non-uniform air voids distribution and the second tailored to obtain homogeneous specimens. The study was performed by using three stone mastic asphalts incorporating up to 30% of RA but designed to have identical properties. A detailed characterisation of the loose mixes and binders, an X-ray computer tomography micro-structural study of the manufactured specimens and a further mechanical characterisation showe…

Materials scienceHomogeneousAsphaltX-Ray CT reclaimed asphalt gyratory compactor ReRoadAir voidsGeotechnical engineeringX ray analysisCivil and Structural Engineering
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