Mechanical Response of Superpave Recycled Hot Mixures in Ontario
Bibliographic record
Abstract
The use of reclaimed asphalt pavement (RAP) for surface course layers is still conservative and even restricted in some instances. The main concern is related to the uncertainty of the long-term performance and effect of RAP in the stiffness of the mix. To counteract this effect, softer virgin asphalt is incorporated in the mix. A laboratory study was conducted on six different Superpave SP12.5 mixtures to determine the impact that RAP has on the dynamic modulus and phase angle of the mixtures, and to quantify the effect of binder bump in the mix behavior. The mixtures were designed and elaborated in the laboratory, and tested following the AASHTO TP-62 standard. Two virgin mixtures, two 20% RAP mixtures, and two 40% RAP mixtures were created with different virgin asphalt performance grades (PG). The results show that laboratory mixtures can be produced with up to 40%RAP with comparable results to the virgin mixtures, and that the use of a softer grade does not always represent a significant enhancement of the stiffness characteristics of the mixtures.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.003 | 0.001 |
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 source (direct Gemma or distilled Codex), 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".