Restoring the Lifespan of Road Pavement in Durham Region in Ontario, Canada, through Innovative Quality Assurance Testing of Recovered Asphalt Binder
Bibliographic record
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.\nThis 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.\nSecond 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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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".