Vieillissement des bétons en milieu naturel : Une expérimentation pour le XXIè siècle : IV. Résultats issus des prélèvements effectués sur les corps d'épreuve de différents sites aux premières échéances de mesure
Bibliographic record
Abstract
A several-year experimental program has been conducted on concrete samples stored in the laboratory as well as on reinforced concrete test specimens under field exposure, in order to characterize, in particular from a durability perspective, a fifteen concrete series ranging from B20 to B120. This program lies within the scope of the task group "Experimental study on exposure sites", as part of the working group "durability" of the National (French) Project "BHP 2000". It lies also within the scope of the research project directed by LCPC "Durability of reinforced concrete and of its constituents : control and performance-based approach". This paper is the fourth in the series "Ageing of concrete in natural environments : an experiment for the 21st century". It presents the experimental program set up to monitor the pre-cracked reinforced concrete test specimens located on the sites of Melun, La Rochelle, Maurienne and Canada. In addition, it includes the experimental results obtained during the first measurement sequence on the cores extracted from the various test specimens. In-situ data, as regards microstructure, moisture properties, mechanical strength, carbonation, chloride ingress, as well as frost and salt degradations (scaling), have been compared to the results from tests carried out on 28-day old water-cured laboratory samples. Gradients between core and surface zone have been observed in situ, which magnitude varied as a function of the mix and environment parameters. Generally speaking, an improved behavior has been observed with high-performance concretes. Moreover, a good agrement, as regards trends and ranking, has been recorded between the results obtained on field and those derived from laboratory samples.
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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 | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| 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".