Academic Journal
Diffusion properties of Gabonese tropical hardwoods and European softwoods measured with low-tech equipment and by an inverse method: English version ; Propiedades de difusión de la madera dura tropical gabonesa y de la madera resinosa europea medidas con equipamiento de baja tecnología y método inverso: Versión inglesa ; Mesure de la diffusion dans le bois des feuillus tropicaux du Gabon et des résineux européens à l’aide de moyens à faible technicité et par méthode inverse: Version anglaise
| العنوان: | Diffusion properties of Gabonese tropical hardwoods and European softwoods measured with low-tech equipment and by an inverse method: English version ; Propiedades de difusión de la madera dura tropical gabonesa y de la madera resinosa europea medidas con equipamiento de baja tecnología y método inverso: Versión inglesa ; Mesure de la diffusion dans le bois des feuillus tropicaux du Gabon et des résineux européens à l’aide de moyens à faible technicité et par méthode inverse: Version anglaise |
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| المؤلفون: | ASSEKO ELLA, Martian, BONTEMPS, Arthur, GODI, Gaël, MOUTOU-PITTI, Rostand, GOLI, Giacomo, IKOGOU, Samuel, FOURNELY, Eric, GRIL, Joseph |
| المصدر: | BOIS & FORETS DES TROPIQUES; Vol. 360 (2024): Bois et Forêts des Tropiques No360; 65-76 ; BOIS & FORETS DES TROPIQUES; Vol. 360 (2024): Bois et Forêts des Tropiques n°360; 65-76 ; 1777-5760 ; 0006-579X |
| بيانات النشر: | Cirad |
| سنة النشر: | 2024 |
| مصطلحات موضوعية: | Diffusion coefficient, equilibrium moisture content, finite-difference method, inverse method, tropical timber species, Gabon, Coeficiente de difusión, contenido de humedad en equilibrio, método de diferencia finita, método inverso, especies madereras tropicales, Gabón, Coefficient de diffusion, taux d’humidité d’équilibre, méthode aux différences finies, méthode inverse, essence tropicale |
| الوصف: | This paper presents an experimental approach to studies of the sorption and diffusion properties of wood. Five timber species - three African tropical hardwoods, Padauk, Okoume and Iroko, and two temperate softwoods, Silver fir and Douglas fir - were studied in adsorption mode. Specimens with 10- and 20-mm longitudinal (L) and transverse (RT) thickness were waterproofed on their sides to force diffusion in those directions. After kiln drying the specimens were hung with nylon wires under cover in a home-made box in which salt solutions provided constant relative humidity (RH), and conditioned at 43, 55, 75, 84 and 97% RH in successive steps. Temperature was maintained between 20 and 24°C. During the equilibration steps the samples were periodically weighed without altering the environmental conditions imposed, by hanging the nylon wire to a spring gauge through a small hole in the box cover. The sorption isotherm properties and diffusion parameters were obtained using an inverse method based on optimization of a 1D finite difference model. The parameters obtained show a decreasing correlation between diffusion coefficient and density, as observed by several authors in the literature. They also illustrate the impact of extractives on the sorption isotherm parameters. These results show that tropical species with high density or many extractives behave very differently to European softwoods, which impedes the application of Eurocode 5 equilibrium standards for these species. ; Este artículo presenta un enfoque experimental en los estudios de las propiedades de sorción y difusión de la madera. Se estudiaron en modo adsorción cinco especies de madera: tres maderas duras tropicales africanas, narra, ocume e iroco, y dos maderas resinosas de clima templado, abeto balsámico y abeto de Douglas. Se impermeabilizaron lateralmente muestras con un grosor de 10 mm longitudinal (L) y 20 mm transversal (RT) para forzar la difusión en estas direcciones. Después de un secado en horno las muestras se colgaron de hilos de nilón ... |
| نوع الوثيقة: | article in journal/newspaper |
| وصف الملف: | application/pdf |
| اللغة: | English |
| Relation: | https://revues.cirad.fr/index.php/BFT/article/view/37392/37599; https://revues.cirad.fr/index.php/BFT/article/view/37392 |
| الاتاحة: | https://revues.cirad.fr/index.php/BFT/article/view/37392 |
| Rights: | (c) Tous droits réservés CIRAD - Bois et Forêts des Tropiques 2024 ; https://creativecommons.org/licenses/by/4.0 |
| رقم الانضمام: | edsbas.206C5F90 |
| قاعدة البيانات: | BASE |
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