BANGLADESH JOURNAL OF FOREST SCIENCE
A Half-yearly Peer Reviewed Journal of Bangladesh Forest Research Institute
A Half-yearly Peer Reviewed Journal of Bangladesh Forest Research Institute
The experiment was undertaken to investigate the retention of 10% Chromated-Copper-Boron (CCB) solution (2:2:1) in Kala-koroi (Albizia lebbeck) (L.) Benth. wood applying soaking as well as diffusion method. The assessments were applied for 5, 7, 9 and 11 days for both the method. Retention was recorded 1.96 kg/m3,11.78 kg/m3,12.92 kg/m3and 13.61 kg/m3 iiij4. lebbeck wood where soaking method applied. Moreover, retention was found 5.22 kg/m3, 6.43 kg/m3, 7.32 kg/m3 and 12.36 kg/m3 in A lebbeck wood when diffusion method applied. In case of both methods the highest retention was recorded 13.61 kg/m3 and 12.36 kg/m3 for 11 days. Considering the Standard of Bangladesh Standards and Testing Institution (BSTI), i.e., 13.61 kg/m3 and 12.36 kg/m3 retention can meet the suitability of the study.
The experiment was undertaken to investigate the retention of clnomated-copper-boron (CCB) preservatives in Pitali (Trewia nudiflora L.) wood applying soaking as well as diffusion method. The assessments were applied for 5, 7, 9 and 11 days for both the method. The retention of the preservatives were recorded 12.29 kg/m3, 14.97 kg/m3, 15.11 kg/m3 and 15.72 kg/m3 in Pitali wood where soaking method applied. Moreover, retention was found 11.43 kg/m3, 23.49 kg/m3, 24.14 kg/m3 and 25.38 kg/m3 in Pitali when diffusion method applied. In case of both the method, highest retention was recorded 15.72 kg/m3 and 25.38 kg/m3 in pitali wood after 11 days. Considering the Standard of Bangladesh Standards and Testing Institution (BSTI), i.e., 15.72 kg/m3 and 25.38 kg/m3 in Pitali can meet the suitability of the study. According to BDS code, the required retention of CCB is 8-16 kg/m3.
A study was conducted on the preservative treatment of Acacia mangium poles to determine the
treatment schedule for out door use. The poles contained 52.27% sapwood which is generally perishable by
wood destroying organisms. In this study, 27 poles were treated with 10% CCB (Copper-Chrome-Boron)
aqueous solution by Lowry empty-cell process. Three different pressure and three time periods were
applied to evaluate the depth of penetration and amount of retention of the preservative chemicals. It was
observed that preservative chemicals penetrated the entire sapwood portion of the poles which is the main
criteria for the protection of poles. But, a little bit increase was observed in penetration with the increasing
pressure and time period. Although, the retention of the preservatives was found to increase significantly
with the increasing pressure and time. The highest retention of22.98 kg/m3 and full penetration of sapwood
was observed at 1.04 N/mm2 pressure for three hours. It is expected that the applied preservative with the
treating schedule can protect the Acacia mangium poles from wood destroying organisms in outdoor
condition.
Eucalyptus camaldulensis poles were treated with 50 : 50 creosote-light
diesel oil mixture. The poles contained an average of 53.85% sapwood which
was readily perishable by wood destroying organisms if untreated. The poles
were treated by the Bethel Full-Cell process using varying pressure and
duration to evaluate the effect on penetration and retention of the preservative
mixture. It was found that with the simultaneous increase of both treating
pressure and time, no significant increase in pentration was achieved. On the
other hand, with the increase of treating pressure only, the retention of
pressrvative in the sapwood was increased significantly. A penetration of 3.5
cm with retention of 318. 45 kg/m3 in the treated sapwood could be obtained
by using 10.57 kg/cm2 pressure for 3 hours. This amount of penetration is
considered adequate to protect the sapwood region of the pole.
Green and freshly felled poles have been treated by a simple method and cheap
chemicals. The equipment can be located very close to the site of felling and the
treatment can be carried out by semi-skilled workmen. An experiment was carried
out with this method on five indigenous wood species namely: garjan (Dipterocarpns
turbinatus), kao (Garceniacowa), jam (Syzygiuni grande), kalibatna (Qnerciisfenestrata)
and rai batna (Quercus thonisoni) with 10% copper sulphate solution at the felling site
of Chunati Forest Range, Chittagong. Analysis of the Results on the penetration and
the retention of the preservative inside the pole indicates that the entire portion of
the sap wood around the pole was completely penetrated and the required retention
was obtained.
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