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Rubberised bitumen manufacturing assisted by rheological measurements

Subhy, A.; Subhy, Ayad; Lo Presti, D.; Airey, G.

Authors

A. Subhy

Ayad Subhy

D. Lo Presti

GORDON AIREY GORDON.AIREY@NOTTINGHAM.AC.UK
Professor of Pavement Engineering Materials



Abstract

This paper investigates the effect of processing temperature and time on the rheological properties of recycled tyre rubber-modified bitumens (RTR-MBs) produced using two different base binders and an ambient ground crumb rubber modifier (CRM). The production of the RTR-MBs was accomplished by means of a standard Brookfield rotational viscometer together with a modified impeller, dual helical impeller, to allow mixing as well as real-time viscosity measurements of the produced RTR-MBs. The rheological properties of the final RTR-MBs were determined by means of standard dynamic mechanical analysis oscillatory and multiple stress creep recovery testing using a dynamic shear rheometer. The results indicate that the low processing conditions (160°C and 60 min) are not appropriate for developing RTR-MBs with enhanced physical and rheological properties. However, allowing the crumb rubber to interact with the base binder for longer mixing times (140 min) led to the development of an enhanced rubber (polymer) network structure within the blend (i.e. swelling of the CRM particles) and superior rheological properties. At the other extreme, using high-processing conditions (200°C and 140 min) led to RTR-MBs in which the rubber network had been subjected to devulcanisation and depolymerisation with a subsequent reduction in modification. © 2015 Taylor & Francis.

Citation

Subhy, A., Subhy, A., Lo Presti, D., & Airey, G. (2016). Rubberised bitumen manufacturing assisted by rheological measurements. Road Materials and Pavement Design, 17(2), 290-310. https://doi.org/10.1080/14680629.2015.1079549

Journal Article Type Article
Acceptance Date Jun 15, 2015
Online Publication Date Sep 10, 2015
Publication Date 2016
Deposit Date Mar 16, 2017
Publicly Available Date Mar 16, 2017
Journal Road Materials and Pavement Design
Print ISSN 1468-0629
Electronic ISSN 1468-0629
Publisher Taylor & Francis Open
Peer Reviewed Peer Reviewed
Volume 17
Issue 2
Pages 290-310
DOI https://doi.org/10.1080/14680629.2015.1079549
Keywords crumb rubber; modified bitumen; rheological properties; viscosity; Binders; Bituminous materials; Creep testing; Dynamic mechanical analysis; Dynamics; Impellers; Mixing; Processing; Rubber; Stresses; Viscosity; Viscosity measurement; Crumb rubber; Crumb
Public URL http://eprints.nottingham.ac.uk/id/eprint/41360
Publisher URL http://www.tandfonline.com/doi/full/10.1080/14680629.2015.1079549
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf
Additional Information This is an Accepted Manuscript of an article published by Taylor & Francis in Road Materials and Pavement Design on 10/09/2015, available online: http://www.tandfonline.com/10.1080/14680629.2015.1079549

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Subhy et al Rubberised bitumen manufacture RMPD Vol 17 2016.pdf (1.2 Mb)
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Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf





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