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Ccb Preservative Treatment of Rajkoroi (albizia Richardiana King &prain) Wood by Soaking Method

A Salam
Wood Preservation Division, BFRI, Chattogram

K Akhter
Wood Preservation Division, BFRI, Chattogram

M A Rahman
Wood Preservation Division, BFRI, Chattogram

M N A Mridha
Wood Working and Timber Engineering Division, BFRI, Chattogram

F H Chowdhury
Executive Officer, Dutch Bangla Bank Ltd., ChittagongBangladesh.

Abstract/ Executive Summary:

This paper presents the information on the treatability of raj-koroi (Albizia richardiana). The feasibility test was performed by soaking method in the present study. In this study, 24 samples of rajkoroi were soaked with 10% CCB (copper -chromate -boron) solution (2:2:1). Every sample was sized into 50.8 cm X 5.08 cm X 2.54 cm. Four different time periods were applied to evaluate the depth of penetration and the amount of retention of the applied preservative chemicals. The study revealed that both penetration and retention of CCB preservatives significantly increased with the rising time periods. Highest penetration and retention were recorded 4.60 cm and 16.88 Kg/m³ respectively after 28 days. It can be decided that preservative treatment on rajkoroi can be executed with a view to using it for fabricating wood related products.

Keywords: Albizia richardiana, Soaking method, Copper-chrome -boron, Penetration, Retention.

Location: Bangladesh Forest Research Institute (BFRI) Laboratory

Start Date:

End Date:

Program Area: Resource Development and Management

Commodity: Koroi

Objectives:

To determine the treat ability group of A. richardiana wood using of CCB preservative treatment by soaking method.

Methodology:

Rajkoroi (Albizia richardiana) wood 35 years old were collected from Barisal district for this study. Then the log were sawn and dried in the shed of Bangladesh Forest Research Institute(BFRI) Laboratory to reduce the moisture content below fiber saturation point (FSP).Samples were collected from the bottom, middle and top containing heartwood. The samples were in the form of 50.8 cm X 5.08 cm X 2.54 cm (20" X 2" x1"). The converted samples were dried in open air for 30 days to reduce the moisture content of the wood samples. The samples were dried in the oven at 105^OC to get constant weight before treating with preservative. Before treatment, all samples were dried and the average moisture content of the samples were recorded 18.92%. Finally 24 numbers of samples were prepared for soaking method. Copper-chromate-boron (CCB) preservative was used in this study. The desired CCB preservative was made by mixing of sodium dichromate, copper sulfate and boric powder as salt-based ratio of 2:2:1 respectively (Lahiry,1996). The desired CCB preservative solution was made by nine times water of total preservatives (sodium dichromate, copper sulfate and boric). Raj-koroi (Albizia richardiana) treeAll the wood samples were dipped into the10% CCB preservative solutions for different duration. Out of 24 samples, every 6 samples were immersed into 10% CCB (copper-chromate-boron) solution (2:2:1) for 7 days, 14 days, 21 days and 28 days respectively. After the desired duration, the treated samples were taken out from preservative solutions step by step, removed excess preservative from the surface of the samples and weighing the treated samples. The average retention of immersed samples was determined by weighing the samples. Then the samples were placed on polythene sheet for air drying. After drying, 3 nos.of samples from each group were splitted for measuring the absorption or penetration. Penetration was measured to the nearest centimeter for each stake and averaged(Anon 1986). The volumetric analysis was used to calculate preservative retention of wood samples. Air dry weight before treatment and air dry weight after treatment were taken to determine the retention. The difference of the two weights was the weight of preservative solution penetrated into the sample. Retention was expressed as kg/m³ .

Source of Information: Eco-friendly Agril. J. 12 (09): 74-77, 2019 (September)

Article Link (Online Journal): www.efaj-international.com

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Rajkoroi can be treated with CCB solution.Subsequently the wood can be used commercially. It is mentionable that untreated rajkoroi samples were destroyed after 7 to 9 months in the soil contact. But the treated A. richardiana samples destroyed after 35 to 40 months.

Knowledge Management: Journal