The mechanical behaviour of chemically-treated PVC geosynthetic membranes /
Bibliographic record
Abstract
Geosynthetics that are usually made of Poly(vinyl) Chloride (PVC) are used as components of engineered barriers in landfill applications. As a component of an engineered barrier scheme, it is used to mitigate the migration of hazardous and toxic mixtures of chemicals that can diffuse through the clay layer in the engineered barrier. The integrity of the geosynthetic layers that are in frequent contact with these chemicals is therefore of interest to the overall waste containment strategy. This thesis conducts a coordinated investigation that will allow the characterization of the deformability properties of geosynthetic materials, subjected to various levels of exposure to ethanol. Chemical alteration can take place by modifications to the fillers or plasticizers that contribute to both strength and ductility of the geosynthetics. The uniaxial tests conducted on a chemically-treated PVC geosynthetics, exposed to ethanol, point to the reduction in flexibility or embrittlement of the material. The results of the experiments conducted in connection with this research program indicate that, in its natural condition, the PVC geosynthetic is capable of undergoing moderately large strains, the constitutive behaviour of which can be modelled through the phenomenological hyperelastic theories by appealing to a strain energy function of the Mooney-Rivlin form. Unlike natural rubber at moderately large strains, which is virtually void of irreversible phenomena and strain-rate effects, the PVC geosynthetic exhibits a strong rate-dependency and irreversible effects; furthermore, the irreversible strains themselves can be within the realm of moderately large strains. The chemically-treated PVC geosynthetic, however, displays a dominant yield behaviour after chemical exposure: the material completely loses its large-strain deformability characteristics after prolonged chemical exposure. X-ray fluorescence techniques point to the loss of the plasticizer a
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 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 | 0.000 | 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) | 0.003 | 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 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".