Strength Properties of Hardwood Timber Species Exposed to Decayand Marine Borer Attack in Tidal Zones
Bibliographic record
Abstract
The Pinaceae family of timber displays sound strength qualities in underground or dry conditions, with good strength in compression parallel to the grain that make them ideal for use as piles.However, they decay rapidly in marine environments, due to low heartwood rot resistance and large radius of sapwood that is susceptible to attack by marine borers and rot.Therefore, preservative treatment of Pinaceae is the standard practice for producing rot resistant timber marine piles in the U.S.While it has been shown that hardwoods can be marginally treated with preservatives, decay evaluations are primarily based on ground contact and lack inspection of post-decay strength properties.This paper describes the ongoing research to chemically treat and evaluate the heartwood of four naturally rot-resistant timber families available in the U.S. for use as marine timber: Black locust, white oak, black walnut, and swamp mahogany.Small clearheartwood samples will be treated with oil-borne preservatives that have already shown better decay protection for red oak over Pinaceae family.The specimens will be sampled annually over the course of a decade in estuary saltwater and tested for decay, marine borer infestation and mechanical properties.Specifically, specimens will be differentiated by exposure in three different zones for comparison to realistic exposure scenarios of a structure: continuous submersion underwater, within the tidal zone for cyclical water and air exposure, and in the splash zone with minimal water exposure.Treated samples will be compared to untreated and preservative treated control specimens of the most common Pinaceae species, loblolly pine, and each hardwood species.This will enable treatment comparison to the industry standard (Pinaceae) and treatment comparison within a species.The objectives of this study are twofold: To establish correlation between rate of decay and strength properties in marine timber, and to determine the viability of treating U.S. hardwoods for use as marine timbers.
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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 | 0.000 |
| 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) | 0.002 | 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".