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Effect of Chromate-copper-boron Preservative Treatment on Physical and Mechanical Properties of Raj Koroi (albizia Richardiana) Wood

SA Shanu
Forestry and Wood Technology Discipline, Khulna University, Khulna-9208, Bangladesh.

AK Das
Forestry and Wood Technology Discipline, Khulna University, Khulna-9208, Bangladesh and Pulp and Paper Technology, Asian Institute of Technology, Klong Luang, Pathumthani-12120, Thailand.

MM Rahman
Forestry and Wood Technology Discipline, Khulna University, Khulna-9208, Bangladesh.

M Ashaduzzaman
Forestry and Wood Technology Discipline, Khulna University, Khulna-9208, Bangladesh.

Abstract/ Executive Summary:

This experiment was carried out to analyze the effects of CCB (chromate-copper-boron) preservative treatment on physical and mechanical properties of Albizia richardiana wood using dipping method. Retention of preservative was maximum at 8% concentration of the preservatives. Based on the retention at this concentration, the physical and mechanical properties of the treated wood were examined. The density of untreated A. richardiana wood was 521 kg/m3. It changed to 542 kg/m3 on treatment. This increase in density by 2.30% for treated wood was significant. On the other hand, modulus of rupture (MOR) increased significantly from 93 to 107 N/mm2 on treatment of the wood. The modulus of elasticity (MOE) increased from 3205 to 4861 N/mm2. Physical and mechanical properties of the wood improved by treating with CCB preservative.

Keywords: Chromate-copper-boron; Albizia richardiana; Physical properties; Mechanical properties

Location: Forestry and Wood Technology Discipline, Khulna University, Khulna-9208, Bangladesh.

Start Date: 00-00-2015

End Date: 00-00-2015

Program Area: Resource Development and Management

Commodity: Tree

Objectives:

1. To determine the effect of CCB preservative treatment on physical and mechanical properties of A. richardiana wood.

Methodology:

Two Albizia richardiana trees, 14-years-old, grown in Khulna University Campus, Khulna (22° 48' 0" N and 89° 33' 0" E), Bangladesh were collected for this study. Samples were collected from the bottom, middle and top containing heartwood. The samples were in the form of 35.0 cm × 5.5 cm × 2.5 cm for MOR and MOE tests. The size of sample for physical properties was 5.0 cm × 5.0 cm × 2.5 cm. The specimen for compression strength perpendicular to grain test was in the form of 8.0 cm × 4.0 cm × 2.0 cm and compression strength parallel to grain tests was in the form of 8.0 cm × 3.0 cm × 3.0 cm. 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. Chromate-copper-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. All the wood samples were dipped into the preservative solutions of 4, 6, 8 and 10% concentrations for 72 hours. 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 placed on polythene sheet for air drying. The volumetric analysis was used to calculate preservative retention of wood samples. Oven dry weight before treatment and oven 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: Bangladesh J. Sci. Ind. Res. 50(3), 189-192, 2015; ISSN 0304-9809 eISSN 2224-7157

Article Link (Online Journal): DOI: http://dx.doi.org/10.3329/bjsir.v50i3.25583

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Albizia richardiana showed the highest retention with 8% concentration of CCB for 72 hours. Due to 8% CCB preservative treatment, most of the physical and mechanical properties of A. richardiana increased from 3 to 14%. The preservatives treatment did not cause any serious problem in case of the strength properties of wood. Thus the CCB treated A. richardiana can be used satisfactorily as interior exercise like furniture and frame manufacturing, house post, roofing etc.

Knowledge Management: Journal, Online Circulation