Preliminary investigation of the vacuum pyrolysis of bituminous roofing waste materials
Bibliographic record
Abstract
The treatment of bituminous roofing waste materials by vacuum pyrolysis was tested in a pilot plant. The pyrolysis experiment was carried out batchwise at a temperature of 500°C and a total maximum pressure of 16 kPa. The amount of feedstock tested was 37 kg. Pyrolysis product yields were 52.3 wt.% oils, 31.2 wt.% solids, 14.4 wt.% pyrolysis gas, and 0.4 wt.% water. Losses were 1.7 wt.%. The pyrolysis oils have a gross calorific value of 42.7 MJ/kg and can be used as a heating fuel. The oil as a whole also represents a valuable material for petrochemical applications. The gas is rich in hydrocarbons and can be used as a make-up heat source (45.2 MJ/kg) for the thermal decomposition process. The solid residues exhibit a moderate calorific value of 17.5 MJ/kg and might find their way as a solid fuel in cement kilns. The nature of the minerals present in the solid residues, which amount to 49.7 wt.%, seems to be compatible with the cement composition. The vacuum pyrolysis technology is viewed as a potential solution to landfill and incineration of this waste construction material. Key words: construction, waste, shingles, bituminous, roofing, pyrolysis, fuels, environment, petrochemicals.
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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 | 0.001 | 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".