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Dimensional changes of extracted and non-extracted small wood specimens of black locust (Robinia pseudoacacia L.)

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Abstract

From straight grained heartwood of black locust (Robinia pseudoacacia L.), specimens, 3 cm×3 cm in cross section and 0.5 mm (or 10 mm) in axial direction, were cut and used for the determination of dimensional changes and the rate of tangential swelling. Mean radial, tangential and axial shrinkage was 5.30%, 6.67% and 0.16%, respectively, while the coefficient of anisotropy was 1.26. Half of the specimens for the determination of the rate of tangential swelling were extracted for 48 h with distilled hot water. The tangential dimensional change and the time taken to attain half maximum swelling in air-dry and oven-dry specimens were assessed according to a common technique. Extractive removal resulted in an increase of the total magnitude of tangential swelling in both air-dry and oven-dry specimens. However, no significant differences in time taken to attain half maximum swelling between air-dry and oven-dry specimens were observed after extraction. The rate of tangential swelling was lower in air-dry specimens than in oven-dry specimens after 30 min of immersion in water when were non-extracted and after 5 min of immersion in water when were extracted. Extracted air-dry specimens had a greater rate of tangential swelling than non-extracted air-dry specimens and the same occurred for oven-dry specimens. Extraction resulted in a higher diffusion coefficient for air-dry specimens. The diffusion coefficient calculated for non-extracted air-dry specimens (0.901×10−4 cm2/min) showed that black locust is a difficult species to impregnate.

Zusammenfassung

Von Robinienkernholz (Robinia pseudoacacia L.) mit senkrecht verlaufenden Fasern, wurden Proben 3 cm×3 cm im Querschnitt und 0,5 mm (oder 10 mm) in axialer Richtung geschnitten und zur Bestimmung dimensionaler Veränderungen und der tangentialen Quellenrate verwendet. Die mittlere radiale, tangentiale und axiale Schrumpfung betrug 5,30%. 6,67% und 0,16%, wobei der Anisotropie-Koeffizient 1,26 betrug. Die Hälfte der Proben zur Bestimmung der radialen Quellung wurde 48 Stunden lang mit heißem destillierten Wasser extrahiert. Die tangentiale dimensionale Veränderung und die benötigte Zeit, um ein halb-maximales Quellen bei Luft- und Ofentrocknung zu erreichen wurde gemäß einer bekannten Methode geschätzt. Die Entfernung der Extraktstoffe führte zu einer Zunahme der Gesamtgröße der tangentiellen Schwellung sowohl der luft- als auch der ofengetrockneten Proben. Es wurden jedoch keine signifikanten Unterschiede in der Zeit nach der Extraktion beobachtet, die benötigt wurde, um die halb-maximale Schwellung zwischen luft- und ofengetrockneten Proben zu erreichen. Die Rate der tangentiellen Schwellung war bei luftgetrockneten Proben niedriger als bei ofengetrockneten Proben nach 30-minütigem Eintauchen in Wasser. Extrahierte luftgetrocknete Proben hatten eine größere Rate tangentieller Schwellung als nicht-extrahierte luftgetrocknete Proben, das gleiche gilt für ofengetrocknete Proben. Die Extraktion führte zu einem höheren Diffusionskoeffizienten bei luftgetrockneten Proben. Der berechnete Diffusionskoeffizient von nicht-extrahierten luftgetrockneten Proben (0,901×10−4 cm2/min) zeigte, dass Robinien eine schwierig zu imprägnierende Spezies sind.

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Correspondence to S. Adamopoulos.

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Part of Doctoral thesis of Mr. Stergios Adamopoulos titled: "Anatomical characteristics and technical properties of black locust wood (Robinia pseudoacacia L.)". Aristotelian University, Thessaloniki, 2001.

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Adamopoulos, S., Voulgaridis, E. Dimensional changes of extracted and non-extracted small wood specimens of black locust (Robinia pseudoacacia L.). Holz Roh Werkst 61, 264–268 (2003). https://doi.org/10.1007/s00107-003-0396-3

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