Restoring the Lifespan of Road Pavement in Durham Region in Ontario, Canada, through Innovative Quality Assurance Testing of Recovered Asphalt Binder
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Authors
Kokabi, Dariush
Date
2024-09-24
Type
thesis
Language
eng
Keyword
Asphalt Pavement , Sustainable Transportation for Cities and Municipalities , Service Life of Asphalt , AASHTO T 405 DENT , AAHTO T 406 EBBR
Alternative Title
Abstract
One of the best ways to manage the performance lifespan of asphalt road surfaces is to test recovered binder for acceptance during construction. In the late 1990s, acceptance specifications advanced from using empirical methods, such as penetration and viscosity on unaged binder to Superpave™ rheology-based tests on unaged and laboratory-aged residue. In the early 2000s, due to premature and excessive cracking of road surfaces in Ontario, rheological and failure tests for unaged and recovered material were developed and implemented.
This study correlates pavement service lives in Durham Region with recovered binder properties. Service lives to a pavement condition index (PCI) of 50 percent – which had decreased by about 66 percent since 1980 – bounced back immediately after the 2015 implementation of the double-edge-notched tension (DENT, AASHTO T 405) and extended bending beam rheometer (EBBR, AASHTO T 406) protocols for the acceptance of recovered binder. Both protocols favor the use of superior quality Alberta and Venezuela binders that are low in wax and contain a moderate amount of asphaltenes. The study shows that by using a proper design based on EBBR grade and grade loss in conjunction with DENT critical crack tip opening displacement (CTOD) was able to restore pavement service lives from 11 years in 2013 to their former 30-35 years in 2020.
Second objective of this study is to consider the possibility of replacing the high time and material consuming EBBR and DENT test methods with accelerated and high precision dynamic shear rheometer (DSR) test method. Although both of these test methods has been showed that can significantly improve the binder evaluation and enhance it even for better by using stricter acceptance criteria (lower grade loss and higher CTOD). Moreover, conducting DENT and EBBR test methods require three days of testing time. Thus, this research is aimed at understanding the correlation between measured parameters resulted from DENT and EBBR with DSR test method. To observe the presence of correlation, T 30° and T 45° limiting phase angle temperatures have been correlated with EBBR and DENT test methods' parameter, and it has been found that there is a good correlation between T 30° with LLTPG and CTOD.
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ProQuest PhD and Master's Theses International Dissemination Agreement
Intellectual Property Guidelines at Queen's University
Copying and Preserving Your Thesis
This publication is made available by the authority of the copyright owner solely for the purpose of private study and research and may not be copied or reproduced except as permitted by the copyright laws without written authority from the copyright owner.