A Hamburg Wheel Track Study on HMA Mixes Using Acid and Non Acid Modified PMAs and Local Aggregates With and Without Lime
Bibliographic record
Abstract
The use of phosphoric acid modification of neat Polymer Modified Asphalt (PMA) binders has been brought into question. This study looks at two aggregates and four binders with and without lime to investigate acid modified binder compatibility issues. Two of the binders are modified with acid. The study looks at Hot Mix Asphalt (HMA) and Stone Mastic Asphalt (SMA) mix types tested in the Hamburg Wheel Tracker to check mixture properties. In conclusion phosphoric acid appears to harm the durability protection of hydrated lime by creating compatibility issues with the materials, although the data is not conclusive. All four binders looked similar in the binder lab, when checked for specification compliance. However, they performed very differently in the Hamburg test. Additional cure time appears to make the Hamburg slabs more durable and rut less. Lime modification increases the mixture durability but in some cases not significantly. This is possibly due to acid in the binder. It is recommended to check HMA with some kind of performance test. Exact procedures must be followed when performing the Hamburg test. Additional research is recommended where the acid types are known along with the base binders and polymers. Cure time for sample preparation should also be evaluated.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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 | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| 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".