Effectiveness of CNI in slabs with a construction joint in a marine environment
Bibliographic record
Abstract
In marine concrete structures, construction joints, formed at the intersect of the end of one concrete placement and the beginning of a new placement, have been identified as vulnerable zones that may permit the intrusion of chlorides over a relatively small area of the reinforcement, thus accelerating corrosion. The present paper reports a research study to evaluate the effectiveness of calcium-nitrite corrosion inhibitor in combination with pulverised fly ash on the corrosion protection of reinforced concrete slabs manufactured with a construction joint intersecting the reinforcement at right angles and exposed to a marine environment for seven years. Electrochemical testing, chloride profiling using the scanning electron microscope/energy dispersive X-ray analyser and assessment of the damage caused by chloride-induced corrosion on the reinforcing bars, were conducted. Results showed that bars retrieved from low water/cementitious material ratio concretes containing calcium nitrite and fly ash experienced negligible corrosion damage; conversely, in specimens prepared with high water/cementitious material ratio, this combination provided a low level of protection.
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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 | 0.000 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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".