Mechanical properties, dimensional stability, and mold resistance of heat-treated jack pine and aspen.
Notice bibliographique
Résumé
Quebec wood species, jack pine (Pinus banksiana Lamb.) and aspen (Populus tremuloides Michx.), were thermally treated in an industrial furnace using 'Bois Perdure' technology. The species were heated from room temperature up to their respective maximum heat-treatment temperatures. The mechanical properties, dimensional stability, and mold resistance of these species were determined and compared with those of untreated wood. This information is essential for the users of these new products. Results indicate that modulus of rupture (MOR) of heat-treated jack pine and aspen decreased, whereas modulus of elasticity (MOE) of the same heat-treated species increased, respectively. The increased MOE indicates that jack pine and aspen became stiffer after the heat treatment. Compared to the untreated species, hardness of treated jack pine in radial, tangential, and longitudinal directions increased whereas the hardness of heat-treated aspen decreased in radial and tangential directions, and increased in longitudinal direction. Screw withdrawal strength of heat-treated jack pine decreased, but this decrease was not significantly different from the untreated controls. Screw withdrawal strength of heat-treated aspen was found to be relatively higher than that of untreated aspen. Dimensional stability was evaluated using both the percentage thickness swelling (TS) tests and water soaking tests for both species before and after heat treatment. All the tests were carried out with a different set of specimens. First, all the specimens were conditioned at 65 percent relative humidity (RH) and 22 °C. Three different tests were carried out using these specimens. TS measurements were carried out for a group of specimens right after the conditioning. The second group of specimens were soaked in water for 24 hours, and their weight change and TS were measured. The third group of specimens were reconditioned at 95 percent RH and 22 °C. Afterwards, their TS was measured. Results show that the dimensional stability of heat-treated jack pine and aspen was improved considerably after heat treatment. Mold resistance of heat-treated jack pine was improved compared to the untreated sample; mold resistance was improved for heat-treated aspen; however, it was not significantly different from the untreated aspen.
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Comment cette classification a été obtenuedéplier
Prédiction machine sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Le volet Gemma est une étiquette directe du modèle pour chaque travail de la base, lue sur la notice réduite au titre. Le volet Codex est un classifieur appris des 10 348 étiquettes directes de Codex et calibré sur les taux pondérés de l'échantillon; les champs sans appui suffisant ne portent aucun appel Codex. Le mode candidate est l'union des deux volets; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont pas des étiquettes humaines.
Scores du classifieur distillé par catégorie (deux têtes)
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,000 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,002 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule source (Gemma direct ou Codex distillé), pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».