Wearing Surfaces: An Experimental Study for an Orthotropic Steel Deck
Bibliographic record
Abstract
A lightweight, durable, and traction-resistant material is needed as a replacement for an existing two-layer timber wearing surface. The surface to be replaced is 30 ft (9.2 m) wide and is attached to an orthotropic closed-cell steel deck. The orthotropic steel deck is supported by two steel box girders that are 61 in. (155.9 cm) wide by 163 in. (414 cm) deep. The bridge is 2295 ft (699.5 m) long with six spans. The structure crosses the Yukon River at a 6% grade on the Dalton Highway, a gravel road about 50 mi (80 km) north of Fairbanks, Alaska. This structure is expected to support the oil pipeline, a future gas line, heavily loaded trucks and respond favorably to mild summers and harsh winters. Air temperature extremes are -58°F (-50°C) to 100°F (40°C). A 5 in. (127 mm) two-layer timber wearing surface was installed in 1976. The top layer was replaced in 1981, 1993, 1999, and 2007. Both layers were replaced in 1993 and 2007. Because of excessive costs, the Alaska Department of Transportation is seeking alternatives. Thermal cracking, abrasion, durability, flexural strain, traction, weight, and a secure fastening method to the steel deck are important in selecting a replacement surfacing material. The driving surface may be dry, wet, icy, snow-covered or some combination. During the winter, the driving surface is subjected to snow plow removal and because of the steep grade, trucks typically cross using tire chains. Several alternate wearing surfaces were laboratory tested for structural durability, traction, and resistance to tire chains. In addition to laboratory test results, field performance for several experimental wearing surfaces was evaluated. Laboratory test results are presented and each wearing surface is ranked for structural integrity, traction, resistance to chain damage, and field performance. Cobra X (no longer available) would likely provide more than a 15-year satisfactory service life. All other wearing surfaces tested in this study including the existing timber wearing surface are an unsatisfactory choice.
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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 | 0.003 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.002 |
| Insufficient payload (model declined to judge) | 0.007 | 0.001 |
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".