Aging analysis of rubberized asphalt binders and mixes using gel permeation chromatography

This study was initiated to investigate the aging characteristics of binders due to the reaction with the crumb rubber. For this laboratory study, the crumb rubber modified (CRM) and control binders were aged using an oven aging method. Also, asphalt mixtures with CRM or control binders were made an...

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Bibliographic Details
Published in:Construction & building materials 2011-03, Vol.25 (3), p.1485-1490
Main Authors: Lee, Soon-Jae, Hu, Jiong, Kim, Hakseo, Amirkhanian, Serji N., Jeong, Kyu-Dong
Format: Article
Language:English
Subjects:
Aging level
Asphalt
Binders
Building materials
Chromatography
Construction materials
Crumb rubber
Gel permeation chromatography
GPC
LMS
Ovens
Reaction
Rubber
Thin films
Trends
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Summary:This study was initiated to investigate the aging characteristics of binders due to the reaction with the crumb rubber. For this laboratory study, the crumb rubber modified (CRM) and control binders were aged using an oven aging method. Also, asphalt mixtures with CRM or control binders were made and subjected to short-term and long-term aging treatments. The properties of these aged binders were evaluated using gel permeation chromatography (GPC) test procedures. The results from this study showed that: (1) the higher CRM percentage resulted in the higher large molecular size (LMS) value of asphalt binder under the binder aging conditions, and the rate of increase in the LMS value was found to have a relation to the CRM percentage. The asphalt binders with higher CRM percentages (15% and 20%) had a trend the LMS values decrease after a certain level. This finding is thought to be related to the required time for the rubber to be fully digested; (2) after subjecting to the long-term oven aging, the asphalt mixtures with the control and CRM modified binders were found to have statistically insignificant differences in aging level, measured using the LMS values. The very thin film thickness of binder in asphalt mixture and the aging temperature of 100 °C insufficient to enable a reaction were considered to be the main reasons that no differences were observed from the standpoint of the aging effect.
ISSN:0950-0618
1879-0526
DOI:10.1016/j.conbuildmat.2010.08.004