Corrosion-Based Service Life Analysis For Adhered Masonry Cladding Systems in Canada
Bibliographic record
Abstract
A corrosion-based service life algorithm was developed to estimate the service life of zinc galvanized metal lath used in the installation of adhered masonry cladding systems in Canada. Using climate data from 14 different Canadian cities representing a broad spectrum of environments, a service life algorithm capable of predicting both corrosion initiation and corrosion propagation times was used to estimate the service live of commercially available zinc-galvanized metal lath embedded in the mortar of adhered concrete stone cladding. Service live was estimated from an approach based on Fick’s law of diffusion and the International Standards Organization (ISO) CORRAG corrosion rate model A. Adjustments were made to the corrosion propagation rate to account for the shape of the lath and temperature fluctuations. The service life of the metal lath was expressed as the sum of the corrosion initiation time and the corrosion propagation time. The results of the analysis demonstrated that using diamond mesh metal lath protected with the most thick commercially available zinc coating (CSA Z275) provides sufficient corrosion resistance to achieve the desired minimum 50-year service life for adhered masonry cladding systems installed in the Canadian Prairies. However, CSA Z275 zinc coating was found to be insufficient to achieve a 50-year service life for claddings installed on the west coast and in Atlantic Canada even when 18 gauge welded/woven wire mesh metal lath and a thicker cover (76.2 mm, 3 in) were considered. For adhered masonry cladding installations in central Canada, it was necessary to utilize an 18 gauge welded/woven wire mesh metal lath protected with CSA Z275 zinc coating and to maintain a minimum cover of 76.2 mm (3 in) thick over the wire mesh in order to achieve the desired 50-year service life.
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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) | 0.000 | 0.001 |
| Bibliometrics | 0.002 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 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".