Bibliographic record
Abstract
Alkali-silica reactivity, a reaction between alkalies usually contained in the cement paste and siliceous aggregates, was positively identified in Nova Scotia in 1962. Powerhouse structures on the Mersey River constructed in 1928-1929 showed intolerable expansion by 1938, and this expansion continues to the present day. Extensive research conducted in the 1960s and 1980s has shown that widespread meta-sediments in Nova Scotia are the principal rock types responsible for the reaction. The rate and extent of reactivity is somewhat dependent on the degree to which the rock has been re-crystallized as a result of contact with intrusive granites. Supplementary cementing materials are effective in reducing or eliminating the excessive expansions caused by the reaction. Class F fly ash has been in general use in Nova Scotia since 1986 and used specifically for reducing alkali-aggregate reactivity since 1990.Key words: alkali-aggregate reaction, expansion, fly ash, meta-sediments, mortar bar test, pozzolans, prism test, quarries, supplementary cementing materials.
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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 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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".