Association of tannin with pyroligneous liquor as a natural preservative for Eucalyptus sp. wood
DOI :
https://doi.org/10.5902/1980509890725Mots-clés :
Decay field, Wood durability, Natural preservatives, Mechanical resistanceRésumé
This study aimed to evaluate the potential use of tannin and pyroligneous liquor as a natural preservative for Eucalyptus sp. wood. Three trees, approximately 10 years old, were felled, and logs were removed and specimens were prepared for application of 4 treatments (control, pyroligneous liquor, liquor and tannin, and chromated copper borate). The treated and untreated logs were exposed to soil in a decay field for a period of 120 days. Chemical analyses: mass loss, penetration, retention and leaching of preservative, visual classification of specimens and static bending tests were performed. The specimens were installed in a decay field and subsequently collected for analysis and determination of properties. The analyses of bulk density at 12% moisture content, static bending, solubility in sodium hydroxide, preservative absorption, and solubility in cold water demonstrated that there was interaction between the factors and statistical differences between and within the treatments. It was concluded that the treatment of Eucalyptus sp. with pyroligneous liquor and tannin, in comparison to the control and to the woods treated only with pyroligneous liquor, was efficient mainly for the property of resistance to static flexure and bulk density, showing itself to be a potential preservative product.
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