Comparison of permeability at different levels of moisture content in Bornmullerian fir (Abies bornmulleriana Mattf.) and Eastern spruce (Picea orientalis L.) impregnated under vacuum/pressure through full-cell method by using CCA and CCB of different concentrations

IRG/WP 07-40366

I Usta

In this study, a comparison has been made in terms of the combined, longitudinal, tangential, and radial permeability of the species of Bornmullerian fir (Abies bornmulleriana Mattf.) and Eastern spruce (Picea orientalis L.) with moisture contents of 50 % and 15 %, which were impregnated under vacuum/pressure through full-cell method by using water-borne wood preservatives (impregnation materials) of Tanalith-C (CCA : copper-chromium-arsenic) and Wolmanit-CB (CCB: copper-chromium-boron) in concentrations of 2.5 % and 3.0 %. The experimental data obtained were examined in terms of the wood species concerned, level of moisture, type of the impregnation material used, concentration of the solution and the direction of the liquid flow, by taking as basis the level of absorption of the two different impregnation materials by the cell cavities of the wood species tested. Results of the tests made by using the impregnation materials of CCA and CCB in different concentrations (2.5 % and 3.0 %) have shown that the level of absorption (in the species of Bornmullerian fir and Eastern spruce) was the highest when the wood was dry (with a moisture of 15 %); and that when the wood was wet (with a moisture of 50 %), absorption of the wood preservative liquid was the highest in both of the species particularly when CCB is used. The results of this study have also revealed that the level of absorption of the impregnation material under all the experimental conditions was higher in the wood of Bornmullerian fir, compared to that of the Eastern spruce. The analyses made by using different concentrations of the impregnation materials have shown that in general, the impregnation materials of lower concentrations were absorbed relatively better by the wood, based on the direction of the liquid flow. In order to see the level of absorption of the impregnation materials, the amounts of liquid flow in different anatomic directions were compared in both species, and it was seen that under all the experimental conditions, the decreasing order of absorption according to direction was: combined>longitudinal>tangential>radial.


Keywords: Bornmullerian fir, Eastern spruce, Wood preservation, Full cell method, CCA, CCB, Moisture content, Permeability, Fluid uptake, Absorption, Net dry salt, Retention

Conference: 07-05-20/24 Jackson Lake Lodge


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