Microstructural characterisation of dry mixed rubberised asphalt mixtures

Hassan, Norhidayah Abdul; Airey, Gordon; Yusoff, Nur Izzi Md.; Hainin, Mohd Rosli; Putrajaya, Ramadhansyah; Abdullah, Mohd Ezree; Aziz, Md. Maniruzzaman A.

doi:10.1016/j.conbuildmat.2015.02.015

Cited by 34 publications

(4 citation statements)

References 15 publications

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“…For example, at the same air voids content, the higher the voids number, the higher the voids connectivity. For voids shape, if the circularity, roundness and aspect ratio values are close to 1.0, it indicates circular air voids while higher aspect ratio and low values of roundness and circularity (approaching 0.0), indicating an increasingly elongated shape of voids [4,5]. The shape parameters were calculated using Equations 1-3.…”

Section: Air Voids Analysismentioning

confidence: 99%

Air Void Characterisation in Porous Asphalt Using X-Ray Computed Tomography

Hassan

Mahmud

Jaya

2014

AMR

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This study presents the characterisation of the air voids distribution for porous asphalt mixtures compacted using gyratory compactor. The distribution of voids content and voids shape within the porous asphalt were characterised for different nominal maximum aggregate size (NMAS) and specimen height. This is to evaluate the effect of different aggregate size composition and lift thickness on the air voids characteristics of the compacted porous asphalt. Two types of gradations were adopted i.e. Grading A (with NMAS=10 mm) and Grading B (with NMAS=14 mm) and they were fabricated for two different heights (50 and 100 mm). The internal structure was captured using X-ray Computed Tomography and image analysis techniques were used to process and analyse the images. It was found that mixture with coarse aggregate gradation produced larger void size with an elongated shape, which indicates voids connectivity within the mixture compared to fine gradation with more circular and smaller void size.For lift thickness, itacts differentlyfor different aggregate gradations. The specimen produced greater voids connectivity when the fine and coarse gradations were compacted at 100 mm and 50 mm respectively. These show that NMAS and lift thickness influence the mobility of the aggregate particles during compaction which affect the voids formation and determine the effectiveness of the compaction.

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Section: Air Voids Analysismentioning

confidence: 99%

Air Void Characterisation in Porous Asphalt Using X-Ray Computed Tomography

Hassan

Mahmud

Jaya

2014

AMR

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“…The master curves of the recovered binders corroborate the trend seen in the ITS. In any case, it is essential to consider the influence of the CR particles as elastic aggregate on the performance of the mixtures [41] and the effect of test temperature. The Marshal tests are conducted at 60 • C, whereas the ITS characterization is performed at 25 • C. Additionally, the rheological analysis confirmed that the difference in the performance is more prominent at higher temperatures.…”

Section: Rheological Behaviour Of the Extracted Asphalt Binder Samplesmentioning

confidence: 99%

Recyclability of Asphalt Mixtures with Crumb Rubber Incorporated by Dry Process: A Laboratory Investigation

et al. 2020

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Semi-Dense Asphalt (SDA) mixtures are nowadays recommended for the surface layer of low noise roads in urban areas due to their optimal functional characteristics. Moreover, the use of polymer-modified bitumen (PmB) in its design results in high mechanical performance. However, this type of highly modified bitumen implies significant economic and environmental disadvantages. The polymer modification increases the production cost, involves higher mixing temperatures, and makes the recycling process of the asphalt mixtures challenging. As a potential alternative to PmB in SDA mixtures, this experimental work analyses the dry process for the incorporation of crumb rubber (CR) from waste tires. Particularly, the main objective was to study the aging effect and the recyclability of asphalt mixtures prepared in the laboratory with two different types of CR. The volumetric properties and mechanical performance of the mixtures artificially aged and rejuvenated were evaluated. The results obtained show that mixtures with CR have adequate performance, being less susceptible to aging than a conventional polymer-modified mixture. Furthermore, the rheological response of asphalt binder samples recovered from the mixtures at different aging states was analyzed. It was observed that the effect of the rejuvenator depended on the CR type, but this fact did not negatively influence the performance of the recycled mixtures.

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“…Other residues such as crumb rubber were used to modify asphalt mixtures. In this sense, Abdul Hassan et al (Abdul Hassan et al 2015) analysed the microstructural properties of asphalt mixtures modified with this residue finding a well distribution of the particles of rubber and differences in air voids depending on the size of the particles. Waste plastic materials were also studied for their reuse into asphalt mixtures materials (Dalhat andAl-Abdul Wahhab 2017, Poulikakos et al 2017).…”

Section: Introductionmentioning

confidence: 99%

Analysing the potential use of a low-grade magnesium carbonate by-product as a filler in hot asphalt mixtures

López-Montero

Maldonado-Alameda

Mañosa

et al. 2022

International Journal of Pavement Engineering

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University of Granada (Spain) and PhD in Transport Engineering and Infrastructures in 2018 by the Technical University of Catalonia (Spain). She has a post-doctoral grant (Juan de La Cierva) at the University of Barcelona awarded by the Spanish Ministry of Science and Innovation. Previously, she was a predoctoral and post-doctoral researcher at the Technical University of Catalonia. Currently, her main research line is the development of more sustainable asphalt mixtures. Alex Maldonado-Alameda: Msc. Renewable energies and energy sustainability and PhD in Engineering and applied sciences in 2021 by the Universitat de Barcelona (Spain). He has a post-doctoral grant (Margarita Salas) at the Universitat Politècnica de Catalunya (Spain)awarded by the Spanish Ministry of Science and Innovation. For many years he worked in the field of construction and architecture as a draftsman, project management assistant, and public tender technician. He also worked in Fundació CIM (UPC) as a trainer in CAD software (AutoCAD, SolidWorks, SketchUp, etc.). He aspires to develop new sustainable building materials that allow progress towards a circular economy based on the zero-waste principle.

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Microstructural characterisation of dry mixed rubberised asphalt mixtures

Cited by 34 publications

References 15 publications

Air Void Characterisation in Porous Asphalt Using X-Ray Computed Tomography

Air Void Characterisation in Porous Asphalt Using X-Ray Computed Tomography

Recyclability of Asphalt Mixtures with Crumb Rubber Incorporated by Dry Process: A Laboratory Investigation

Analysing the potential use of a low-grade magnesium carbonate by-product as a filler in hot asphalt mixtures

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