Le mûrissement à l'eau de chaux des échantillons de béton en laboratoire est-il adapté au cas des bétons contenant des cendres volantes?
Bibliographic record
Abstract
In order to study the influence of the maturation type on the behavior of concrete containing fly ash, specimens of mixtures and mortars have been made with a water/binder ratio of 0.40. In all cases, the proportion of fly ash has been constant and equal to 20%. Different maturation types have been studied: the confinement in an aluminum foil, the immersion in a lime saturated solution and the immersion in an NaOH and KOH solution simulating the interstitial solution that is found in concrete. At different times, the composition of the interstitial solution, the resistance to compression, the content of chemically bound water as well as the quantity of portlandite have been measured in order to evaluate the maturation effect. The results show that the maturation type has an influence on the fly ash hydration rate. The data also indicate that it is essential that the specimens have enough water to hydrate themselves. In the case of the confinement of samples, evaporation must absolutely be avoided. In order to qualify mineral additions representatively, and to measure their properties on representative specimens of the conditions usually found in the concrete structure mass, the alkalinity of the interstitial solution must be preserved. Immersion of samples in an NaOH and KOH solution at a concentration simulating that of the interstitial solution is suggested. The maturation in lime water provides enough water for hydration but pulls down the alkalinity of the interstitial solution too rapidly, which reduces the fly ash hydration rate.Key words: maturation, fly ash, cement, lime water, interstitial solution, chemically bound water, resistance, portlandite.[Journal translation]
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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 | 0.004 | 0.009 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.002 | 0.001 |
| Scholarly communication | 0.003 | 0.002 |
| Open science | 0.001 | 0.002 |
| Research integrity | 0.002 | 0.001 |
| Insufficient payload (model declined to judge) | 0.013 | 0.004 |
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".