Durability and sustainability in CSA S6:25 Canadian Highway Bridge Design Code – A unified service life design process to cover all structures and materials
Bibliographic record
Abstract
<p>The 2025 version of CSA S6, Canadian Highway Bridge Design Code, builds on concepts introduced in S6:19. Section 2 provides a methodology and provisions for the designer to achieve a 75 years design service life, simply by following all steps of the code.</p><p>The service life design procedure is a significant addition which guides the designer to make appropriate decisions related to the structural system, structural details, materials, and protection systems. Firstly, the user defines the design service life, assigns macro-environment(s) to the structure, and classifies exposure zones for all components. Exposure zones are described qualitatively but some quantitative limits are provided. Secondly, the user assesses deterioration risk by examining all deterioration mechanisms applicable to each exposure zone and material. Finally, the user applies mitigation measures which are mapped to the deterioration mechanisms through exposure classes. Material-specific mitigation measures in the material sections are linked to exposures through a series of standard ‘roadmap’ tables. The design engineer is required to apply mitigative measures consisting of avoidance, deemed-to-satisfy approaches, or special analysis and testing (including probabilistic modeling) if allowed by the Owner. Intended for non-replaceable components with a design service life of 75 years in S6:25, the framework is scalable and can be extended to replaceable components and other design service life values in future editions. The procedure will minimize the risk of durability failures.</p>
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 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 teacher head, 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".